Underfloor heating in the bathroom is something clients ask for more and more during full renovations. The question is always the same: is it worth what it costs?
The honest answer: it depends. On which type you choose, how many months a year you use it, and whether it’s installed correctly from the start.
Electric vs hydronic: which to choose in a bathroom
Electric underfloor heating uses heating cables or mats placed under the floor. It installs in hours, needs no boiler room, and works with any renovation. Installation costs between 40-70 €/m² including materials. For a 6 m² bathroom, that’s 240-420 € just for the system, plus labour.
Hydronic underfloor heating circulates hot water through pipes. More efficient long-term, especially connected to a heat pump or aerothermal system. But retrofitting it into an existing bathroom is problematic: it requires raising the floor by several centimetres, which in 1970-90s flats in Valencia can mean serious headroom issues.
For bathroom renovations, electric wins almost every time. Simpler, cheaper to install, less disruptive. Hydronic makes sense for new builds or complete renovations where the floor is already up and you’ve planned the whole heating system.
Real installation costs in 2026
| System | Installation cost (m²) | 5 m² bathroom | 8 m² bathroom |
|---|---|---|---|
| Basic electric | 40-55 €/m² | 200-275 € | 320-440 € |
| Premium electric | 55-75 €/m² | 275-375 € | 440-600 € |
| Hydronic (renovation) | 70-120 €/m² | 350-600 € | 560-960 € |
| Hydronic (new build) | 50-80 €/m² | 250-400 € | 400-640 € |
Add a programmable thermostat: 60-180 € depending on whether it’s basic or smart (with app, weekly scheduling). Warmup and Devi have WiFi models from 90 €.
Labour for a small bathroom where the floor is already up during renovation: 100-200 € extra. If the floor needs lifting specifically for this: 300-500 € more.
Brands we use
Warmup is the reference brand in Spain for electric systems. Their low-consumption mat (DWM) is what we install most in bathrooms — it adapts well to irregular surfaces and comes with a decent thermostat. Kit for a 6 m² bathroom: 180-250 €.
Devi (a Danfoss brand) has Spanish presence but fewer distributors than Warmup. Their DSIG-20 cable is reliable, and with a programmable thermostat the price per m² is similar.
Rehau is better known for hydronic systems, where their PE-Xa pipe system is a benchmark. The solid choice for new builds and full renovations going hydronic.
Flooring compatibility
Electric underfloor heating works with almost any flooring. The key factors are thickness and thermal conductivity:
- Porcelain stoneware: perfect conductivity, ideal. The standard in Valencia bathrooms.
- Ceramic tiles: works well, similar to porcelain.
- Natural stone: good conductivity if not excessively thick.
- Vinyl/PVC: only compatible with ultra-thin low-profile systems. Check with manufacturer.
- Wood: not recommended in wet bathrooms.
What no system tolerates: flooring with an air gap or installed on wooden battens. Heat doesn’t transmit and the system overworks.
Real energy consumption in Valencia
For a 6 m² bathroom (subtracting the shower area where no mat is installed, about 4 m² of actual heated area):
- Installed power: 150 W/m² × 4 m² = 600 W
- Average daily use: 1.5 hours/day in cold months (October–March in Valencia)
- Daily consumption: 0.9 kWh
- Daily cost at 0.20 €/kWh: 0.18 €
- Monthly cost (30 days): 5.40 €
In Valencia’s Mediterranean climate, annual running costs rarely exceed 40-50 € for a small bathroom. This changes in older flats with no insulation where the tiled floor sits at 15°C in winter.
When does it pay back?
For electric installed during a full renovation (extra cost 200-400 €), strict payback in energy savings alone is hard to justify. The bathroom radiates heat for minutes per day, not hours.
The honest position: underfloor heating in the bathroom is justified by comfort, not savings. Stepping onto a warm floor at 7am in winter has a value that doesn’t show up on the electricity bill.
If energy savings are the priority, the money is better spent on a heat-recovery extractor or better window insulation.
Our recommendation
For full bathroom renovations in Valencia: we install Warmup electric whenever clients ask for it and budget allows. The extra cost during the renovation is small (200-350 €) and the comfort improvement is real in cold months.
For holiday homes used only in summer: only if the property has active heating in winter. A heated floor that sits unused 10 months a year pays back nothing.
For partial renovations without lifting the floor: not recommended. The intervention cost doesn’t justify it.
Planning a full bathroom renovation? Check our bathroom renovation cost guide or get a quote.
