Wet vs Electric Underfloor Heating: Which Costs More?
There are two fundamentally different underfloor heating systems, and the upfront vs running cost trade-off differs substantially between them.
Wet (Hydronic) UFH
Wet systems circulate warm water through pipes embedded in the floor screed, connected to your boiler or heat pump. Installation is more complex — pipework, manifolds, and a screed pour are all required — which pushes the supply-and-install cost to £70–120/m² of heated floor area. A typical 60 m² ground floor would therefore cost £6,000–9,000 fully installed. However, because wet systems operate at lower flow temperatures (35–45°C rather than 70°C for radiators), they pair exceptionally well with heat pumps and can deliver cheaper running costs per kWh over the system's lifetime.
Dry Electric UFH
Electric systems use resistance heating mats or cables laid directly under tiles or flooring. They are far simpler to retrofit — a competent DIYer can lay a bathroom mat in a day — which brings the installed cost down to £50–100/m². A typical 5 m² bathroom fitted with electric UFH, including supply and installation, typically costs £500–700. The trade-off is running cost: electricity (currently around 24–25p/kWh in the UK) is more expensive per unit than gas, so electric UFH is best suited to smaller areas or occasional use rather than whole-home heating.
Underfloor Heating Cost Per m²: Wet vs Electric at a Glance
The table splits the typical 2026 UK price into materials and labour so you can compare quotes line by line. Figures are ranges from published UK supplier and installer pricing and vary by region, floor build-up and access.
| Cost item | Electric (dry) UFH | Wet (hydronic) UFH |
|---|---|---|
| Heating system supply (mat/cable or pipe, manifold) | £25–50/m² | £30–55/m² |
| Insulation boards | £5–15/m² | £5–15/m² |
| Installation labour | £15–35/m² (electrician for connection, Part P) | £20–40/m² (plumber/heating engineer) |
| Screed or levelling compound | £5–15/m² (self-levelling latex) | £15–30/m² (liquid or sand-cement screed) |
| Thermostat and controls | £40–150 per zone | £150–300 per zone (actuators, zone controller) |
| Typical all-in installed cost | £50–100/m² | £70–120/m² |
| Typical 5 m² bathroom | £500–700 | Rarely worthwhile |
| Typical 60 m² ground floor | £3,000–6,000 | £6,000–9,000 |
| Running cost per m² per year | Around £5–8 for moderate use | Lower with gas; lowest with a heat pump |
| Best suited to | Retrofits, single rooms, solar or off-peak tariffs | New builds, extensions, heat pump homes |
Component lines are indicative and overlap with the all-in figure rather than summing exactly, because installers bundle supply and labour differently. Ask every installer to itemise so you can compare like for like.
How much does underfloor heating installation labour cost?
Labour typically runs £15–40 per m², or around £200–350 per day for a heating engineer or electrician depending on region. A bathroom mat is often a one-day job, a 20 m² room two to three days, and a whole ground floor of wet UFH one to two weeks including manifold, pipework and screed pour. Retrofitting into an existing floor adds lifting, levelling and making good, which can add £20–40/m² again. Electric connection must be done or certified by a Part P-registered electrician; wet systems should be commissioned by a competent heating engineer.
Cost Breakdown by Project Size
The table below gives realistic budgets for common project sizes. Costs assume professional installation and include supply, labour, screed or adhesive, and thermostat — but exclude any structural alterations or floor removal.
Bathroom (approx. 5 m²)
Electric UFH is overwhelmingly the first choice for a single bathroom. Expect to pay £500–700 in total for a quality mat, adhesive, thermostat, and a half-day of a tradesperson's time. Wet systems are rarely worthwhile for a bathroom alone given the cost of connecting to a manifold.
Kitchen or Large Room (approx. 20 m²)
At this scale both system types are viable. Electric: £1,000–2,000; wet: £1,400–2,400, all installed. If you already have a wet UFH manifold serving adjacent rooms, extending it to a kitchen is usually cheaper than adding a second electric circuit.
Whole Ground Floor (approx. 60 m²)
This is where wet systems pay back. Budget £6,000–9,000 for wet UFH covering a typical UK semi-detached downstairs, versus £3,000–6,000 for electric — but bear in mind the significantly higher annual running costs for electric at this scale (see below).
Worked example: what does a 20 m² room cost to fit and run?
Take a 20 m² kitchen-diner with 18 m² of usable floor after cabinets. The figures below use the per-m² ranges above and a stated set of running assumptions, so swap in your own tariff and hours.
| Electric (dry) UFH | Wet (hydronic) UFH | |
|---|---|---|
| Installation (18 m² heated) | £900–1,800 | £1,260–2,160 |
| Thermostat/controls | £40–150 | £150–300 |
| Installed total | £1,000–2,000 | £1,400–2,400 |
| Running cost per day (heating season) | About £1.50–2.50 | About £0.50–0.90 (gas boiler or heat pump) |
| Running cost over a 6-month heating season | About £270–450 | About £90–160 |
Running-cost assumptions: electric mat at roughly 100–150 W/m² on for the equivalent of 4–5 full-power hours a day (6–9 kWh) at around 25p/kWh; wet UFH delivering about 6–9 kWh of heat a day, from gas at roughly 6–7p/kWh with boiler losses, or from a heat pump at a seasonal efficiency of about 3. Real figures swing with insulation, floor covering, thermostat set-point and tariff, so treat the daily numbers as a guide, not a bill forecast.
Electric underfloor heating running cost per hour, day and month
A standard electric mat draws about 150 W per m², so every m² costs roughly 4p per hour to run at today's UK electricity prices. Which? uses the same 150 W assumption and the Ofgem price cap (27.69p/kWh for Oct–Dec 2025) to reach about 3.95p per m² per hour; the table below applies roughly 25–28p/kWh and three hours of use a day, so check your own unit rate.
| Room | Per hour (full power) | Per day (3 hours) | Per month (3 h/day) |
|---|---|---|---|
| 1 m² | 3.8–4.2p | 11–13p | £3.40–3.90 |
| 5 m² bathroom | 19–21p | 56–63p | £17–19 |
| 10 m² room | 38–42p | £1.13–1.26 | £34–38 |
| 20 m² room | 75–84p | £2.25–2.52 | £68–76 |
Thermostats stop the mat drawing power once the floor is up to temperature, so real bills are usually lower than full-power maths. Supplier guides such as Nu-Heat's cost page put electric at roughly three times the running cost of warm-water underfloor heating, which matches the wet-versus-electric gap above. Some UK guides quote higher installed prices for wet systems than our table (around £100–190/m² for retrofit jobs, for example MyJobQuote), so treat £70–120/m² as the new-build and straightforward-job end.
Floor covering changes these numbers: tile and stone release heat quickly, while thick carpet slows it. See best flooring for underfloor heating for what suits each system, and best underfloor heating thermostats for controls that cut the hours.
Underfloor Heating Running Costs
Running costs depend on the system type, floor area, insulation standard, thermostat behaviour, and local energy tariff. The following estimates assume average UK energy prices and a reasonably well-insulated home.
Electric UFH Running Costs
Electric underfloor heating typically costs around £5–8 per m² per year for a moderately used room at current UK electricity rates. A 5 m² bathroom running for a few hours each morning would cost roughly £25–40 per year. Scaled to a 60 m² ground floor used as primary heating, the annual electricity bill for the UFH circuit alone could reach £300–480 at current rates — which is why whole-home electric UFH is rarely the economical choice unless you have solar PV or an off-peak tariff such as Octopus Go.
Wet UFH Running Costs
Wet systems connected to a modern gas boiler cost somewhat less per kWh than electric, and those connected to a heat pump are considerably cheaper again — heat pumps deliver 3–4 units of heat for every unit of electricity consumed. This makes wet UFH the natural partner for heat pump installations, a combination strongly recommended by the Energy Saving Trust. If you are planning a heat pump, specifying wet UFH at the same time maximises your return on the heat pump investment. For more on pairing these systems, see our guide to smart thermostats for heat pumps.
How a Smart Thermostat Reduces UFH Running Costs
Underfloor heating has more thermal mass than radiators — it takes longer to heat up and longer to cool down. This makes smart scheduling even more valuable: a good UFH-compatible smart thermostat can reduce heating bills by 10–20% by learning your schedule, pre-heating the floor before you wake up, and not wasting energy heating an empty home.
Look for thermostats with features such as adaptive start (which calculates when to begin heating so the floor reaches temperature at the right time), open-window detection, and multi-zone control if you have more than one manifold circuit. Our dedicated roundup of the best underfloor heating thermostats in the UK compares the leading models for both wet and electric systems, including options that integrate with Home Assistant and other smart home platforms.
If your home already has a smart thermostat managing radiators, check whether it supports UFH — many do via add-on receiver units. Our best smart thermostat UK guide covers compatibility in detail.
Additional Cost Factors
Insulation
UFH insulation boards placed beneath the heating element are not optional if you want the system to perform efficiently — without them, heat conducts downward into the subfloor rather than upward into the room. Budget an extra £5–15/m² for insulation boards; this cost is usually included in installer quotes for new builds but may be additional on retrofits.
Screeding (Wet Systems)
Wet UFH requires the pipework to be encased in a screed — typically a liquid anhydrite screed, which self-levels and is popular for UFH. Screeding typically adds £15–30/m² to the project cost and must cure for several weeks before the floor covering can be laid. This is the main reason wet UFH suits new builds and major renovations far better than simple retrofits.
Floor Covering Compatibility
Not all floor coverings work equally well with UFH. Tiles and stone have excellent thermal conductivity and are the most efficient choice. Engineered timber and vinyl are generally compatible, but solid timber and thick carpet significantly reduce heat output. Your UFH installer should confirm compatibility before any flooring is specified.
Multi-Zone Control
A larger wet UFH installation will have several circuits connected to a central manifold, each controlled by its own thermostat. Multi-zone setups add cost — allow £150–300 per additional zone for actuators, wiring, and a zone controller — but they deliver far better comfort and efficiency than a single thermostat controlling the whole ground floor. For comparison, see how smart boiler controls handle zone management in our best smart boiler controls guide.
Is Underfloor Heating Worth the Cost?
Whether UFH is worth it financially depends heavily on your situation. For a new build or major renovation with a heat pump, wet UFH almost certainly stacks up — it works at lower temperatures, improves comfort, and eliminates radiators. For a bathroom retrofit, electric UFH is a low-risk upgrade with a modest payback period. For a whole existing house, the disruption and cost of retrofitting wet UFH into a lived-in home rarely makes sense unless the floors are already being replaced.
The Energy Saving Trust's guidance is broadly that UFH performs best as part of a wider low-carbon heating upgrade — heat pump, good insulation, and smart controls together. If you are weighing UFH against other upgrades, our explainer on whether smart heating is worth it in the UK puts the numbers in context.
What to look for in an underfloor heating quote
Itemised lines: supply, insulation, labour, screed, controls and electrical or plumbing connections should each be priced separately. Coverage area: you only pay to heat the floor area not covered by fixed units such as baths and kitchen cabinets, so measure the usable floor rather than the room. Floor build-up: a raised floor height limit can rule out wet systems, whereas low-profile electric mats or overlay boards add only a few millimetres. Controls: choose an underfloor heating thermostat compatible with your floor sensor and any smart home platform. Warranty: electric mats commonly carry 10–25 year warranties from the manufacturer, but installers usually require a resistance test before and after laying.
How much should you spend on underfloor heating?
Under £1,000: a single bathroom or small kitchen with an electric mat. £1,000–£3,000: a larger room, a conservatory or an extension with electric UFH, or a small wet loop tied to an existing manifold. £3,000–£9,000+: a whole ground floor, best done with wet UFH during a renovation or heat pump install. Prices vary by region and installer, so treat these as planning bands, not quotes.
Getting Quotes
Always get at least three quotes from qualified installers. For wet UFH, look for members of the Heating and Hotwater Industry Council (HHIC) or the Chartered Institute of Plumbing and Heating Engineering (CIPHE). BEAMA, the Building Engineering Services Association, publishes guidance on specifying heating systems and can help you ask the right questions of any installer. Electric UFH installation involving new circuits must be carried out or certified by a Part P-registered electrician.
Related: best underfloor heating thermostats, best flooring for underfloor heating, and heat pump installation costs UK.
