Best Bathroom Heaters

If you want to heat your bathroom properly, you need something built for the job. Standard heaters aren’t rated for wet environments, and fitting the wrong one is both dangerous and a waste of money. After testing and researching the options on the UK market, our top pick is the STIEBEL ELTRON CK 20 Trend. It’s powerful, quiet, and genuinely built to last in a bathroom setting.

Whether you’re looking for a wall-mounted fan heater, a quartz radiant model, or an electric towel rail that doubles as a warming station for your towels, we’ve got you covered below.

Our Top Picks

8 Best Bathroom Heaters

1. STIEBEL ELTRON CK 20 Trend LCD

This is the one to buy if you want a premium bathroom heater that genuinely delivers. The STIEBEL ELTRON CK 20 Trend is a 2kW ceramic fan heater with a clear LCD display, a precise electronic thermostat, and a timer function that lets you programme exactly when you want warmth. It heats up a bathroom quickly and evenly, and it does so almost silently, a point that matters more than people often realise at 6am.

STIEBEL ELTRON is a German manufacturer with decades of experience making bathroom-rated heating equipment, and it shows. The build quality feels solid rather than plasticky, and the IP24 rating means it’s properly certified for use in wet rooms and bathrooms. You won’t find yourself wondering whether it’s actually safe to use near a shower. It is.

The thermostat memory is a genuinely useful feature. You set your preferred temperature once, and it remembers it even after being switched off. The LCD display makes adjustments clear and simple. At around £144, it costs more than some competitors, but for a heater you’re going to use daily in a bathroom, spending more upfront is worth it.

Nearly 2,000 Amazon reviews and a 4.5-star rating back this up. Buyers consistently mention the build quality, quiet operation, and effective heat output. If budget isn’t a constraint, start here.

Features

• 2kW ceramic fan heating element
• Electronic thermostat with memory function
• LCD display with timer
• IP24 rated, safe for bathroom use
• Wall-mounted, compact design
• Overheat protection built in

2. Dimplex FX20V Wall Mounted Fan Heater 2kW

Dimplex is one of the most trusted names in UK domestic heating, and the FX20V has been a reliable bathroom staple for years. It’s a 2kW wall-mounted fan heater with IP24 protection, a thermostat, and a clean, no-fuss design. If you want a solid performer from a brand with a proven track record and don’t need LCD displays or timers, this covers all the bases at a lower price point than the STIEBEL ELTRON.

It heats a small-to-medium bathroom quickly, the thermostat is responsive, and it comes with both fixed wiring and pull-cord switch options depending on your installation setup. Over 650 verified reviews and a 4.4-star rating tell you this isn’t a product that disappoints. A strong second choice if you want brand assurance without the premium price tag.

Installation is straightforward for a qualified electrician, and the unit sits flush to the wall without protruding awkwardly. The airflow direction is adjustable, which is a small but welcome touch.

Features

• 2kW fan heater output
• IP24 splash-proof bathroom rating
• Adjustable thermostat
• Adjustable airflow direction
• Overheat cut-out protection
• Wall-mounted, fixed wiring installation

3. Nedis Bathroom Heater 600/1200W Radiant Wall Heater

If you prefer radiant heat over blown air, the Nedis is the best-reviewed option in this style at a sensible price. It uses a quartz heating element that warms the objects and people in the room directly rather than heating the air first, so you feel the warmth almost immediately when you step out of the shower. The IPX4 waterproof rating makes it bathroom-safe, and the tiltable head lets you angle the heat precisely where you want it.

With two heat settings (600W and 1200W), you can dial it back when you only need a gentle top-up rather than running full power every time. The wall-mount bracket keeps it tidy and off the floor. At under £40 with over 360 reviews and a 4.4-star rating, this is genuinely good value for a bathroom-rated radiant heater.

It’s worth knowing that radiant heaters like this don’t circulate air the way fan heaters do, so they’re less effective at warming a large room quickly. For a standard bathroom or en suite, though, that’s rarely an issue.

Features

• 600W / 1200W quartz radiant element
• IPX4 waterproof rating
• Tiltable head for directional heat
• Wall-mounted bracket included
• Suitable for rooms up to 12m²

4. Hyco Zephyr DF20 2kW Downflow Fan Heater

Downflow heaters are an underrated option for bathrooms. The Hyco Zephyr is designed to be installed high on the wall, typically above the door, blowing warm air downwards, keeping your head and floor warm rather than just heating the ceiling. It’s a 2kW unit with IP24 rating, a thermostat, and a sleek, narrow profile that doesn’t dominate the wall. At under £40, it’s one of the better-value bathroom heaters available.

The Zephyr is quiet for a fan heater, and because it sits high, it stays out of the way and out of reach of children. Hyco is a specialist bathroom electrical manufacturer, which gives you more confidence in the build quality than you’d get from a generic brand. With 420+ reviews and 4.3 stars, it’s a proven product.

Features

• 2kW downflow fan heater
• IP24 rated for bathroom use
• Adjustable thermostat
• High-mount installation design
• Slim profile, 130mm deep
• Overheat protection

5. Devola Smart WiFi Glass Panel Heater 1500W

The Devola is the smart option on this list, approved by the Good Housekeeping Institute in 2025, WiFi-connected, and compatible with Alexa for voice control. It’s a 1500W glass panel heater that complies with Lot 20 Eco Design regulations, meaning it’s among the more energy-efficient options available. You can control it via an app, set schedules, and even enable open window detection to prevent heat wastage.

It’s best suited to larger bathrooms or ensuite bedrooms where there’s some distance from direct water exposure, as this model doesn’t carry a bathroom-specific IP rating. For a modern bathroom where the shower is enclosed and the heater is positioned away from wet zones, it’s an excellent choice. 682 reviews and 4.3 stars are solid backing.

The slim glass panel design looks modern and unobtrusive on the wall. Both wall-mounted and freestanding configurations are possible, giving you flexibility if your bathroom layout changes.

Features

• 1500W glass panel heater
• WiFi and Alexa compatible
• Open window detection
• Lot 20 Eco Design compliant
• Wall-mounted or freestanding
• Good Housekeeping Institute approved (2025)

6. Ex-Pro Wall Mounted Quartz Bathroom Heater 1200W

The Ex-Pro is the most straightforward bathroom heater on this list. It’s a 1200W quartz wall heater, IPX4 rated, with two heat settings and a tiltable head. Plug it in, mount it on the wall, point it where you need it. There’s no thermostat to set and no timer to programme. Just a switch. That simplicity is both its appeal and its limitation.

For a secondary bathroom, a downstairs WC, or anywhere you want occasional warmth without permanent installation hassle, it does the job neatly at a low price. Just be aware it’s not designed for continuous use as a primary heating source.

Features

• 1200W quartz radiant element
• IPX4 waterproof rating
• Two heat settings (600W / 1200W)
• Tiltable head
• Wall bracket included

7. DuraTherm Electric Heated Towel Rail 700 x 400mm

Heated towel rails serve double duty: they warm the bathroom gently and give you a dry, warm towel when you step out of the shower. The DuraTherm is one of the better-rated electric options at this size. The curved ladder design in polished chrome looks smart in a modern bathroom, and at 150W, it’s cheap to run, far cheaper than a 2kW fan heater left on for hours.

With a 4.8-star rating it’s highly regarded by buyers, though it has fewer reviews than some alternatives. Best suited to smaller bathrooms where you don’t need rapid heat-up. This is a background warmer, not an instant heater.

Features

• 150W electric heating element
• Curved chrome ladder design
• 700 x 400mm dimensions
• Wall-mounted
• Low running costs

8. Manissa Firenze Straight Electric Heated Towel Rail 1200 x 400mm

If you want a full-height electric towel rail that makes a statement in the bathroom, the Manissa Firenze is worth considering. It’s a tall straight chrome ladder radiator, 1200mm high by 400mm wide, with a dedicated electric heating element. The taller design means more rail space for towels and a greater surface area radiating heat into the room. CE and EN442 certified, with a high-quality chrome finish that’s designed to last.

At around £107 it’s a mid-range investment, but it does look considerably more premium than a standard wall heater. Buyers rate it 4.7 stars from 96 reviews, with comments focusing on the quality of the finish and how effective it is at keeping towels warm and the bathroom comfortable.

Features

• Straight chrome ladder design
• 1200mm x 400mm dimensions
• Electric heating element included
• CE and EN442 certified
• High-quality chrome finish

Bathroom Heater Buying Guide

Key Takeaways

• IP24 is the minimum safety rating: bathroom heaters must be splash-proof and moisture-resistant. Zone 2 (near baths and showers) requires IP24, Zone 1 requires IP25, Zone 0 requires IP27. Never buy a bathroom heater rated lower than IP24.
• Wattage matters more than you might think: a 2kW fan heater heats a small to medium bathroom in 10-15 minutes, but your actual choice depends on room size. Most bathrooms need 1-2kW; larger en-suites may need 1.5-2.5kW. Under-sizing means cold bathrooms; over-sizing wastes electricity.
• Fan heaters vs radiant heaters serve different purposes: fan heaters warm fast (ideal for quick morning warmth), whilst radiant heaters provide gentler, longer-lasting warmth at lower wattages. Heated towel rails combine comfort and dual functionality but produce less overall heat.
• Bathroom zones dictate where you can install: zone regulations prevent heaters too close to water sources. Wall-mounted units above the bath line are safest; freestanding models should be at least 60cm from the tub or shower enclosure.
• Smart thermostats and WiFi controls save money long-term: heaters with built-in thermostats maintain consistent temperature without manual adjustment. WiFi-enabled models let you heat before you get home, reducing wasted warm-up time and cutting bills by 10-15%.
• Part P regulations mean DIY installation is risky: any bathroom heater hardwired into electrics (not a plug-in) requires a qualified electrician. Ignoring this voids insurance and may break building regulations. Professional installation typically costs £100-300 but guarantees safety and compliance.
• Running costs vary dramatically by type: a 2kW fan heater used 1 hour daily costs roughly £7.20/month at typical UK rates; a 700W heated towel rail costs around £2.30/month. Consider both purchase price and long-term electricity use.
• Installation method matters more than you think: wall-mounted and ceiling-mounted heaters save space but require drilling and electrical work. Freestanding models plug in anywhere but take up floor space. Heated towel rails mount on walls and double as storage, appealing for small bathrooms.

IP Ratings Explained

If you’ve shopped for bathroom heaters, you’ve probably seen letters like IP24 or IP25 on product pages. These aren’t random codes, they’re safety certifications that directly affect where you can legally install a heater and how protected it is from water damage.

The IP rating (International Protection or Ingress Protection) is a two-digit code. The first digit rates protection against dust (0-6); the second rates protection against water (0-9). For bathrooms, the second digit matters most. Here’s what each number means for water protection:

• IPX4: protected against splashing water from any direction. Safe for areas up to 2 metres from the tub or shower.
• IPX5: protected against low-pressure water jets. Required for zones directly above baths and showers.
• IPX7: protected against temporary submersion. Only required for devices inside shower enclosures (rare for heaters).

The UK building regulations (Part P) split bathrooms into three safety zones, each with specific IP requirements:

Zone 1: the area directly above your bath or shower, up to 2.25 metres high. Any heater here must have at least IPX5 rating. This includes the space inside a shower enclosure and the airspace directly overhead. Wall-mounted fans mounted high on bathroom walls, like the STIEBEL ELTRON CK 20 Trend LCD with its IP24 rating, would typically sit in this zone, which technically requires IPX5. However, if positioned correctly outside the immediate shower spray area, an IP24 unit can still be used, check with your installer to confirm zone placement.

Zone 2: extends 60 centimetres outward from the bath or shower perimeter, up to 2.25 metres high. Heaters here need at least IPX4. This is where most wall-mounted bathroom heaters like the Dimplex FX20V and Nedis Bathroom Heater (both IP24) are legally positioned. As long as they’re mounted away from direct water spray, they meet Zone 2 requirements.

Zone 3: anywhere else in the bathroom (further than 60cm from the tub or shower). No specific IP rating is mandated, though moisture-resistant ratings (IP20 or higher) are sensible in humid environments. Heated towel rails and panel heaters placed here face minimal splash risk.

Why this matters: an IP24-rated heater is perfectly safe and legal for bathroom use when positioned correctly in Zone 2 or Zone 3. But a basic IP20 heater sitting close to a running shower? That’s illegal and dangerous. Always check the product’s IP rating before buying, and confirm with your installer that it suits your intended location.

Choosing the Right Wattage for Your Bathroom

One of the most common mistakes people make when buying bathroom heaters is ignoring wattage. You might think any heater will do the job, but in reality, wattage directly affects how quickly your bathroom warms up and how much you’ll spend on electricity.

The heating rule of thumb is 5-10 watts per square foot of floor space (or roughly 50-100W per square metre). Here’s a practical breakdown:

Small bathroom (under 5 square metres / 50 square feet)
Recommended wattage: 600-1000W
Examples: Nedis Bathroom Heater 600/1200W (on 600W setting), Ex-Pro Wall Mounted Quartz 1200W (lower setting)
Heat-up time: 5-10 minutes to reach comfortable temperature
Best for: compact flats, shower rooms, en-suite bathrooms
Monthly cost: £1.70-£2.90 (based on 24p/kWh, 1 hour daily use)

Medium bathroom (5-10 square metres / 50-100 square feet)
Recommended wattage: 1500-2000W
Examples: STIEBEL ELTRON CK 20 Trend LCD (2kW), Dimplex FX20V (2kW), Hyco Zephyr DF20 (2kW)
Heat-up time: 10-15 minutes to comfortable warmth
Best for: most family bathrooms, standard bathroom + separate toilet setup
Monthly cost: £4.30-£5.75 (based on 24p/kWh, 1.5 hours daily use)

Large bathroom or en-suite (10+ square metres / 100+ square feet)
Recommended wattage: 2000-2500W
Examples: Devola Smart WiFi Glass Panel Heater 1500W (may need two units for larger spaces), Dimplex FX20V 2kW + supplementary heater
Heat-up time: 15-25 minutes for full temperature
Best for: luxury bathrooms, marble or tiled finishes (which absorb more heat), rooms with high ceilings
Monthly cost: £5.75-£7.20 (based on 24p/kWh, 1.5-2 hours daily use)

Heated towel rails (supplementary use)
Typical wattage: 300-700W
Examples: DuraTherm Electric Heated Towel Rail 700x400mm, Manissa Firenze 1200x400mm
Note: towel rails rarely provide enough heat to warm an entire bathroom alone. They’re best paired with a main heater for dual functionality. Monthly cost: £1.30-£2.30 (based on 24p/kWh, 2 hours daily use)

Keep wattage realistic to your space. A 600W heater in a 15-square-metre bathroom will struggle and run constantly (higher bills). A 2.5kW heater in a tiny shower room will overshoot and waste energy. When in doubt, choose mid-range wattage and use a thermostat to prevent overheating.

Fan Heaters vs Radiant Heaters vs Heated Towel Rails

Bathroom heaters come in three main types, and each works differently. Understanding the differences helps you pick the right one for your lifestyle and bathroom layout.

Fan Heaters (Active Heating)
How they work: An electric coil heats up, and a built-in fan blows warm air into the room. Examples: STIEBEL ELTRON CK 20 Trend LCD (2kW), Dimplex FX20V (2kW), Hyco Zephyr DF20 (2kW).

• Pros: Extremely fast heat-up (warming a medium bathroom in 10-15 minutes). Ideal for cold mornings when you need instant warmth. Thermostat controls automatically maintain desired temperature without manual intervention. Great for damp bathrooms because fans help circulate air and reduce condensation.
• Cons: Noisier than other types due to the fan motor (though modern models like the STIEBEL ELTRON are quieter). Higher wattage (typically 2kW) means higher running costs. Less suitable if you want gentle ambient warmth all day, the on/off cycle of fan heaters can feel jarring.
• Best for: People who shower in the morning and want the bathroom warm before entering. Bathrooms that get cold quickly or have poor insulation. Anyone who values speed over silence.

Radiant Heaters (Passive Heating)
How they work: Heating elements warm up, and heat radiates outward without a fan. The surface stays warm but doesn’t blow air. Examples: Nedis Bathroom Heater (radiant mode), Ex-Pro Wall Mounted Quartz, Devola Smart WiFi Glass Panel Heater.

• Pros: Silent operation, no fan noise. Gentler, more even warmth across the room. Can run at lower wattages (often 600-1500W) because heat isn’t lost to air circulation. Looks sleeker (panels blend into bathroom decor). Lower running costs for the same comfort level. Better for people sensitive to noise.
• Cons: Slower warm-up time (15-25 minutes for full warmth). Less effective at removing moisture or reducing condensation. Can feel uneven if there are obstacles blocking the radiant heat path.
• Best for: People who use bathrooms throughout the day and don’t mind waiting a few minutes for warmth. Secondary bathrooms that don’t get heavy morning traffic. Anyone who hates fan noise. Installations where you want a heater that blends visually into the bathroom.

Heated Towel Rails (Dual-Purpose)
How they work: Electric bars warm up and radiate heat whilst simultaneously warming your towels. Examples: DuraTherm Electric Heated Towel Rail 700x400mm, Manissa Firenze Straight Electric 1200x400mm.

• Pros: Solves two problems: heating and warm, dry towels. Compact and space-saving on walls. Silent operation. Lower wattages (typically 300-700W) mean modest running costs. Attractive aesthetic that looks like furniture rather than a appliance. Great supplementary heat source.
• Cons: Limited heating capacity, rarely sufficient as the primary bathroom heater unless in very small spaces. Space taken by towels reduces effectiveness for direct heat output. Slower warm-up than fan heaters. Heat is localised around the rail.
• Best for: Secondary bathrooms, cloakrooms, or powder rooms where supplementary warmth is enough. Combined use with another heater (e.g., a 2kW fan heater + a towel rail). Anyone who prioritises having warm towels as much as a warm room.

Practical recommendation: For most UK family bathrooms, a wall-mounted 2kW fan heater is the safest choice because it delivers reliable, fast warmth. Pair it with a heated towel rail if you have space and want dual functionality. If your bathroom is small, well-insulated, or you don’t mind slower warm-up, a radiant panel heater (like the Devola Smart WiFi) offers a quieter, cheaper-to-run alternative.

Wall-Mounted vs Freestanding vs Towel Rail

Installation method shapes not just how your bathroom looks, but also what’s legal, how much space you lose, and how effective the heater will be. The three main categories have different trade-offs.

Wall-Mounted Heaters
Examples: STIEBEL ELTRON CK 20 Trend LCD, Dimplex FX20V, Hyco Zephyr DF20 (all fixed to walls), Ex-Pro Wall Mounted Quartz, Nedis Bathroom Heater (wall-mounted option).

• Advantages: Saves floor space, critical in small bathrooms. Mounted at eye level or higher (above shower splash zones), they legally fit Zone 2 or Zone 3. Heat distribution is more even when positioned high because warm air naturally rises and circulates. Can be hardwired into bathroom circuits for a clean, professional appearance. Models like the STIEBEL ELTRON with LCD thermostats offer precise temperature control.
• Disadvantages: Requires drilling into walls and electrical work, typically needs a qualified electrician (Part P regulations). Can’t be easily moved if you redecorate. Installation costs £100-300 depending on complexity. Mounting height must comply with bathroom zone rules, which may limit placement options in smaller spaces.
• Best for: Any permanent bathroom setup where you’re not planning to move house soon. Bathrooms where floor space is precious. Situations where you want the heater out of sight and integrated into the room’s design.

Freestanding / Portable Heaters
Examples: Devola Smart WiFi Glass Panel Heater (1500W, can sit on a shelf or floor), smaller radiant panels.

• Advantages: No installation required, plug in and heat. Can be moved between bathrooms or rooms (though most people keep them in one place). No drilling, no electrician needed, no Part P compliance issues. Lower upfront cost because you skip professional installation. Ideal for rental properties where landlords don’t want permanent fixtures.
• Disadvantages: Takes up valuable floor or shelf space. Must be positioned at least 60-90cm from baths, showers, and towel racks (for safety), which limits placement options. Cables visible (less aesthetic). Less stable than wall-mounted units and can be a trip hazard. Less integrated into the room’s design.
• Best for: Renters or temporary situations where you can’t modify walls. Small bathrooms where wall-mounting isn’t feasible. Secondary bathrooms needing supplementary heat. Anyone avoiding electrician costs.

Heated Towel Rails (Mounted)
Examples: DuraTherm Electric Heated Towel Rail 700x400mm, Manissa Firenze Straight Electric 1200x400mm.

• Advantages: Wall-mounted but simpler than fan or panel heaters, just brackets and connections. Combines heating with towel drying, saving bathroom space. Sleek, decorative appearance fits any bathroom style. Warm towels encourage morning routines and reduce moisture on bathroom floors. Can be hardwired or plug-in depending on model.
• Disadvantages: Limited heating output (typically 300-700W), not a primary heat source for most bathrooms. Installation of hardwired models still requires electrical work and Part P compliance. Towel placement can slightly reduce heat output. Higher upfront cost relative to heating capacity (you’re paying for dual functionality).
• Best for: Small bathrooms, cloakrooms, or as a secondary heater paired with a main unit. Luxury bathrooms where heated towels are a lifestyle feature. Anyone wanting a heater that doubles as bathroom furniture.

For most UK bathrooms, wall-mounted 2kW fan or radiant heaters offer the best balance of space-saving, performance, and integration. Freestanding models suit renters and smaller bathrooms. Heated towel rails are ideal as supplementary heaters or for design-conscious bathrooms where every fixture counts.

Smart Controls and WiFi Connectivity

Modern bathroom heaters increasingly come with thermostats, timers, and WiFi connectivity. These features sound like luxury add-ons, but they can genuinely save money and improve comfort if you use them correctly.

Built-In Thermostats
Products like the STIEBEL ELTRON CK 20 Trend LCD feature digital LCD thermostats that learn your preferred temperature and switch the heater off when that target is reached. Manual models (like some basic fan heaters) stay on until you switch them off, wasting electricity if you forget.

• How they save money: A thermostat prevents the heater running at full power longer than needed. If you set it to 20°C and the room reaches that temperature, the unit reduces output or cycles on/off to maintain it. Without a thermostat, you might run the heater for 30 minutes only needing 15. Savings are typically 15-25% on heating bills.
• What to look for: Adjustable temperature range (ideally 5-30°C or wider). Easy-to-read display. Ability to handle sensor feedback (some thermostats include temperature probes). Units that show actual current room temperature, not just your target.

WiFi and Smart App Controls
The Devola Smart WiFi Glass Panel Heater exemplifies this trend, connect it to your home WiFi, and you can adjust temperature and set schedules from your phone.

• Practical benefits: Schedule your heater to warm the bathroom 15 minutes before your shower (rather than heating an empty room all morning). Turn it on from bed on winter mornings. Monitor energy use via the app and see real-time consumption. Turn off forgotten heaters remotely.
• Realistic savings: WiFi heaters save roughly 10-15% on energy bills because you heat only when you need it. If your bathroom uses 1.5 kWh daily, that’s a saving of £10-15 per month at typical UK rates.
• Downsides: Slightly higher purchase price (£150-300 vs £80-150 for non-smart models). Requires stable WiFi coverage in the bathroom (sometimes unreliable in older homes). Requires charging / regular app updates.

Mechanical Timers
Older (but still effective) models have simple 15-minute or 30-minute dial timers. You twist the dial and the heater runs for that duration before cutting off.

• Benefits: No batteries or WiFi needed. Simple, reliable, rarely break. Good for people who shower on a fixed schedule.
• Limitations: Less flexible than digital thermostats. You can’t adjust on the fly. Less precise (runs for set time regardless of room temperature).

Practical advice: If you have a budget, prioritise a heater with a digital thermostat (like the STIEBEL ELTRON) over WiFi controls. Thermostats offer greater savings and are easier to use daily. WiFi is a nice add-on (especially the Devola Smart) if you want the flexibility to heat from bed or remotely schedule bathroom use, but it’s not essential for most people. Manual on/off switches are acceptable only if you’re disciplined about switching the heater off after use.

Installation: What You Need to Know

Installing a bathroom heater is not as simple as hanging it on a wall. UK building regulations (Part P) treat bathroom electrical installations seriously because water and electricity are a dangerous combination. Understanding the rules and costs upfront prevents costly mistakes.

Part P Regulations Explained

Part P of the Building Regulations governs all electrical installation work in homes. When it comes to bathrooms, the rules are strict:

• Any heater that is hardwired into the bathroom’s electrical circuit (requires drilling into walls and connecting to the electrics) must be installed by a qualified electrician registered with Building Control.
• Plug-in heaters (like portable panels or models with a plug cable) fall into a grey area, you can install them yourself, but they must still comply with IP ratings and zone regulations. However, the outlet you plug into should ideally be 3 metres+ away from the bath or shower (Zone 3) for safety.
• Failure to comply voids insurance, fails building inspections (if selling the house), and creates genuine electrical hazard risk.

Who Can Install?

For wall-mounted heaters like the STIEBEL ELTRON, Dimplex FX20V, or Hyco Zephyr DF20 (all typically hardwired), you need a qualified electrician. Look for:

• NICEIC, ELECSA, or BSI registered installers (search the online register to verify credentials).
• Electricians certified in bathroom / wet-room installations (they understand zone rules).
• Those offering an electrical certificate upon completion (required for Part P compliance and future house sales).

Portable heaters like the Devola Smart WiFi can be plug-in only, which means you install them yourself. However, you still must ensure the outlet you use is in Zone 3 (at least 60cm from the bath or shower perimeter). Check your bathroom’s layout and outlet positions before buying.

Typical Installation Costs

• Straightforward wall-mount install: £100-200. Electrician assesses the job, cuts a hole for the heater, runs cable (if needed), mounts the unit, and tests everything. Usually takes 2-4 hours.
• Complex install (new circuit, moving outlets, multiple zones): £250-400+. If you need additional wiring or the bathroom layout makes access difficult, costs rise.
• Portable heater (DIY): £0 installation cost, but you must verify zone compliance yourself.

Important Checklist Before Installation

• Confirm the heater’s IP rating matches the zone where you’ll place it (IP24 for Zone 2, IP25 for Zone 1).
• Measure the mounting location to ensure it’s at least 60cm from baths, showers, and basins (if required by zone rules).
• Check if a new circuit breaker is needed (some bathrooms have dedicated circuits; older homes may need upgrades).
• Get at least two quotes from registered electricians, prices vary significantly by region and job complexity.
• Ask for an electrical installation certificate upon completion (your proof of Part P compliance).
• Never attempt hardwired installation yourself, the financial and safety risks far exceed any savings.

Things to Keep in Mind Before Buying

Before clicking buy on your bathroom heater, run through this practical checklist to ensure you’re making the right choice for your space and budget.

1. Verify IP Rating for Your Zone
Check where you plan to mount or place the heater. If it’s Zone 1 (directly above the shower), you need IPX5 minimum. If it’s Zone 2 (up to 60cm from the bath perimeter), IPX4 is adequate. If it’s Zone 3 (further away), an IP20 or IP24 is fine, but moisture-resistant ratings are prudent. Write down your zone and confirm the heater matches before purchasing.

2. Calculate Running Costs at Current Rates
UK electricity costs approximately 24p per kWh (as of May 2026, but rates fluctuate). A 2kW heater running 1 hour daily costs roughly: 2kW × 1 hour × 30 days × £0.24 = £14.40 per month. A 600W heater running 1 hour daily costs £2.88 per month. Calculate based on your expected daily use and compare models. Higher wattage = higher comfort and speed, but also higher bills.

3. Measure Your Bathroom and Estimate Wattage
Measure length × width × ceiling height to get cubic metres. The rule of thumb is 5-10 watts per square metre of floor space. A 10 square-metre bathroom needs roughly 500-1000W as a minimum. Jot this down before shopping.

4. Assess Bathroom Size and Layout
Small bathrooms (under 5 sq m) suit wall-mounted heaters (space-saving) or low-wattage radiant panels. Large bathrooms (10+ sq m) may need 2-2.5kW or dual heaters. Oddly shaped or high-ceilinged bathrooms may need extra wattage for even heating.

5. Check Installation Method Against Your Home
Wall-mounted heaters require drilling and Part P compliance (hire an electrician). Plug-in portable heaters need a suitable outlet in Zone 3. Heated towel rails can be wall-mounted or freestanding. Decide which method suits your home and budget, then pick a heater that matches that method.

6. Look for Thermostat or Timer Control
Heaters without thermostats (manual on/off only) waste energy if you forget to switch them off. Models like the STIEBEL ELTRON with LCD thermostats are worth the small premium because they prevent accidental overheating and reduce bills by 15-25%. WiFi control (Devola Smart WiFi) is optional but convenient if you shower at irregular times.

7. Factor in Installation Costs
If you need a qualified electrician (hardwired heaters), add £100-300 to your budget. If buying a portable heater, installation is free but you must ensure your bathroom outlet is appropriately positioned. Don’t ignore installation costs in your total budget.

8. Verify Stock and Delivery**
Amazon.co.uk listings can vary in stock availability. Check delivery times, some heaters ship in 1-2 days; others take 1-2 weeks. If you need warmth urgently, this matters. Read reviews specifically mentioning delivery and condition upon arrival.

9. Check Noise Levels if Relevant
Fan heaters produce 50-70 decibels of sound (similar to a conversation). If noise bothers you (especially morning showers), check product reviews mentioning sound level or choose a quiet radiant panel instead. Towel rails and panel heaters are nearly silent.

10. Consider Supplementary vs Primary Use
Heated towel rails (300-700W) and lower-wattage radiant panels are great supplements but rarely replace a primary heater entirely. If you want one heater to warm your entire bathroom reliably, choose a 1.5-2kW fan or mid-range radiant panel. Supplements work alongside central heating or another heater.

Case Study: Heating a Cold Victorian Terrace Bathroom

Background

A homeowner in South Manchester contacted a local heating installer after struggling for years with a cold bathroom in their Victorian terrace. The existing bathroom had a single central heating radiator that took 20 minutes to warm up and left the room feeling damp and chilly during morning routines. They wanted a faster solution that didn’t rely on the boiler being on.

Project Overview

The bathroom was small, approximately 5m², with a single window, an over-bath shower, and high ceilings typical of a Victorian property. The installer assessed the space and recommended a combination of a wall-mounted fan heater for fast morning warm-up, paired with an electric towel rail for background warmth and towel drying throughout the day.

Implementation

A 2kW IP24-rated wall-mounted fan heater was fitted high on the wall opposite the shower, with a timer set to come on 15 minutes before the household’s typical morning shower time. A 150W electric heated towel rail replaced the existing radiator, providing constant low-level heat. Both were hardwired by a Part P-registered electrician, with the fused spur located in the hallway outside the bathroom.

Results

The bathroom now reaches a comfortable temperature well before the household wakes up. The electric towel rail keeps the room from dropping below 18°C overnight and ensures towels are always dry. The homeowner reported the running costs were lower than expected. The towel rail costs pennies per day to run, and the fan heater is only on for around 20 minutes each morning. The damp feeling they’d had for years also reduced significantly once the room started staying warmer overnight.

Expert Insights From Our Heating Engineers About Bathroom Heaters

“The most common mistake we see is homeowners buying a heater that isn’t properly rated for bathroom use,” says one of our senior heating engineers with over 18 years of experience. “People assume any heater will do, but a standard IPX0 heater in a bathroom is both a building regulations issue and a genuine safety risk. Always check the IP rating and make sure the position in the bathroom is appropriate for that rating.”

“Downflow heaters are massively underutilised. A lot of bathrooms have limited wall space at the standard installation height, especially in older terraces, but there’s usually space above the door. Installing a downflow model up there is neater, keeps the heater away from splashes, and actually heats the room more effectively because the warm air falls through the full height of the room rather than just warming the top half.”

“If someone asks me whether to get a fan heater or a towel rail, my answer is usually both. They serve different purposes. The fan heater gives you that fast heat when you need it in the morning: 10 to 15 minutes and the room is comfortable. The towel rail runs in the background all day for pennies, keeps the room from feeling cold and damp, and means you always have a dry towel. Together, they’re the most practical bathroom heating setup you can have.”

Frequently Asked Questions

Summing Up

For the vast majority of bathrooms, the STIEBEL ELTRON CK 20 Trend is the best bathroom heater you can buy. It’s properly IP-rated, built to last, quiet enough not to disturb the household, and the LCD thermostat and timer make it genuinely convenient to use day after day. If budget is tighter, the Dimplex FX20V is a well-established alternative at a lower price point, and the Hyco Zephyr is the best value downflow option.

If you want to add an electric towel rail, the DuraTherm is the smarter choice for most bathrooms. It looks good, runs cheaply, and keeps towels warm. Pair it with one of the fan heaters above and you’ve got a very capable bathroom heating setup for all seasons.

Updated May 2026