Underfloor heating is one of the most requested upgrades during Devon property renovations. It delivers comfortable, even heat without visible radiators, and when paired with an efficient heat source — a modern condensing boiler or an air source heat pump — can reduce heating costs compared to poorly balanced radiator systems.
But underfloor heating is not universally suitable. Devon's housing stock includes large numbers of older properties with solid floors, high ceilings, and older insulation standards — conditions that can reduce UFH efficiency and increase running costs beyond what the marketing materials suggest.
This guide covers both types — wet (water-fed) and electric — and gives realistic cost and suitability guidance for Devon homeowners.
Types of Underfloor Heating: Wet vs Electric
Wet underfloor heating (hydronic UFH) uses a network of water-carrying pipes embedded in or beneath the floor, connected to your existing heating boiler or heat pump. Water circulates at low temperature (typically 35–45°C, compared to 70–80°C for radiators) through the floor slab.
Electric underfloor heating uses resistance wiring — either a mat or loose wire system — beneath floor tiles or other hard flooring. It is powered directly from the mains and controlled by a thermostat.
| Feature | Wet UFH | Electric UFH |
|---|---|---|
| Installation cost | High (£50–£100 per m²) | Lower (£20–£40 per m²) |
| Running cost | Lower (uses existing boiler or heat pump) | Higher (direct electricity) |
| Suitable for renovation | Yes (overlay or screeded) | Yes (thin overlay systems) |
| Suitable for new build | Ideal | Possible but costlier to run |
| Floor coverage | Whole-house viable | Best for smaller zones |
| Heat-up time | Longer (3–8 hours) | Faster (30–60 minutes) |
Wet Underfloor Heating Costs in Devon
Wet UFH installation costs depend on whether this is a new build (screed poured over the pipe network) or a retrofit (overlay system on top of existing floor, or removal of existing floor for new screed):
| Scenario | Typical cost (Devon, 2026) |
|---|---|
| New build wet UFH, per m² (manifold excluded) | £25–£50 per m² |
| Full ground floor new build (100 m²) | £3,500–£6,000 |
| Retrofit wet UFH with new screed, per m² | £45–£80 per m² |
| Retrofit overlay system (low-profile), per m² | £30–£55 per m² |
| Manifold and controls (typical 5-zone system) | £800–£1,500 |
| Boiler upgrade if existing boiler not compatible | £2,000–£3,500 additional |
These figures apply in Devon. Rural properties with access challenges or extended pipe runs to outbuildings will see costs toward the upper end.
Electric Underfloor Heating Costs in Devon
| Scenario | Typical cost (Devon, 2026) |
|---|---|
| Electric UFH mat, per m² (supply and fit) | £20–£40 per m² |
| Kitchen (15 m²) electric UFH | £400–£700 |
| Bathroom (6 m²) electric UFH | £200–£350 |
| Thermostat and controls per zone | £100–£250 |
Electric UFH is economical to install in single rooms. Running costs are higher — approximately £0.05–£0.09 per m² per hour at current UK electricity prices — which makes whole-house electric UFH significantly more expensive to run than a wet system.
Is Underfloor Heating Suitable for Older Devon Properties?
This is the critical question for most Devon homeowners. The answer depends on:
Floor insulation. Wet UFH requires adequate floor insulation beneath the heating loop. In an older Devon property with a solid concrete or flagstone floor, heat will preferentially conduct downward unless insulation is in place. Adding insulation means raising the floor level, which affects door frames, thresholds, and skirting boards.
Ceiling height. UFH heats from the floor up. In properties with high ceilings — common in Victorian and Edwardian Devon houses — the effective occupied zone is a smaller proportion of the total volume. The UFH output must be sufficient for the increased ceiling height.
U-value of the walls. UFH is designed for properties with reasonable insulation. In a solid-wall Devon farmhouse with a high U-value, the fabric heat loss may be high enough that UFH struggles to maintain comfortable temperatures during cold snaps without very high water temperatures — which defeats the efficiency advantage.
Renovation scope. If a full ground floor renovation is being undertaken — floor removed, insulation installed, screed laid — then wet UFH is almost always worth including at that stage. The incremental cost during a renovation is much lower than a standalone UFH installation.
UFH and Heat Pumps in Devon
The low flow temperatures of wet UFH (35–45°C) are a natural match for air source heat pumps, which operate most efficiently at low flow temperatures. If you are considering a heat pump under the Boiler Upgrade Scheme (£7,500 grant), pairing it with UFH in a reasonably well-insulated property is the most efficient combination.
For Devon rural properties considering this route: the fabric first — insulation, draught-proofing, and floor insulation — significantly affects whether a heat pump and UFH combination performs as expected. Seek an independent heat loss calculation before committing to either.
Frequently Asked Questions
Is underfloor heating worth it in Devon? For new builds and full renovations: yes. For single-room retrofits (kitchen, bathroom): usually yes for electric. For whole-house retrofit in an older Devon property without substantial insulation: assess carefully with a heat loss survey first.
Can underfloor heating be used with an existing boiler? Yes, provided the boiler can operate at lower flow temperatures. Most modern condensing boilers can be adjusted. Older atmospheric boilers — common in Devon rural properties — may need replacement to work efficiently with UFH.
How long does underfloor heating take to heat up? Wet UFH in a screed floor: 3–8 hours. This means it is most effective on a schedule that maintains temperature rather than cycling on and off. Electric UFH mats: 30–60 minutes — suitable for bathroom and kitchen on-demand use.
Can I mix underfloor heating and radiators? Yes. A common approach in Devon renovations is to install wet UFH in a new kitchen extension or ground floor open-plan space, while keeping radiators in older parts of the house. The system uses a blending valve to lower the flow temperature to the UFH circuit while maintaining higher temperatures to the radiators.
For central heating installations across Devon — including UFH manifold installation and zone control — our heating engineer team covers Tavistock, Okehampton, Launceston, and the wider service area.