Electric vs Wet Underfloor Heating: Which Is Right for Your Home?

Two technologies, one outcome — warm floors. But electric and wet underfloor heating work completely differently, suit different properties, and have very different cost profiles over their lifetime.

This guide gives you a clear comparison so you can make the right choice for your home — and find the right installer for whichever system you choose.

Quick Comparison Table

How Electric Underfloor Heating Works

Electric UFH uses resistive heating elements — mats, cables, or foil — installed directly under your floor covering.

The three types of electric UFH:

1. Heating mats (most common) Pre-woven cables on a fibreglass mesh. Rolled out and tiled over. Best for bathrooms and kitchens with ceramic or porcelain tiles.

2. Loose heating cables Individual cables that you staple in custom patterns. Better for irregular room shapes. More labour-intensive to install.

3. Foil systems Thin foil elements installed under floating wood or LVT floors. No adhesive required. Quick to install and remove.

Electric UFH pros

• Lower upfront cost: Install a single bathroom for £300–£550 all-in
• No plumbing required: An electrician or competent tiler can install mats
• Thin profile: 3–6mm for mats, 18mm max for thicker systems
• Easy to install in renovation: No screed, no disruption to plumbing
• Responsive: Heats up in 20–40 minutes (less thermal mass)

Electric UFH cons

• Higher running costs: Electricity currently costs ~24p/kWh vs gas at ~6p/kWh
• Not cost-effective for whole houses: Running costs become prohibitive across large floor areas
• Shorter lifespan: Mats typically last 10–25 years; wet pipes last 50+
• Single zone: Each room is typically its own circuit — no whole-house zone management without extra controls

How Wet (Hydronic) Underfloor Heating Works

Wet UFH circulates warm water (typically 35–55°C) through a network of polyethylene pipes buried in screed or embedded in overlay boards. The water is heated by a boiler, heat pump, or solar thermal system.

A manifold controls water flow to each zone (room or area), allowing independent temperature control throughout the house.

Wet UFH pros

• Lower running costs: Particularly efficient with a condensing boiler or heat pump — wet UFH typically uses 15–40% less energy than radiators
• Heat pump compatible: Heat pumps work best at low flow temperatures — exactly what wet UFH needs. This is the primary driver of heat pump installations today.
• Whole-house comfort: Even heat distribution across all floors, no cold spots or draughts
• Long lifespan: Pipe systems warranted for 25 years, realistically lasting 50+
• Better with renewable energy: Works with ground source heat pumps, solar thermal, biomass boilers
• Increases property value: A whole-house wet UFH system is a significant selling point

Wet UFH cons

• High upfront cost: £6,500–£21,000 for a whole house, depending on size and system
• Major disruption for retrofits: Floors must be lifted, pipes laid in screed, screed relaid — takes weeks
• Slow thermal response: Screed systems take 1–4 hours to reach temperature (though modern controls manage this well with pre-heating schedules)
• Requires competent installer: Pipe layout, pressure testing, balancing, and heat loss calculations are all professional tasks
• Floor height: Traditional screed systems add 65–100mm of floor build-up (overlay boards keep this to 18–22mm)

When to Choose Electric UFH

Electric underfloor heating makes most sense when:

✅ You're tiling a bathroom or small area

The most popular use case. A bathroom electric mat is low-cost, quick to install, and transforms the experience of stepping out of the shower.

✅ You're retrofitting a single room

If you want to add UFH to a kitchen or extension without disrupting the whole house, electric is far less disruptive than retrofitting wet pipes.

✅ You're in a rented property

Electric mats under tiles can be installed without structural changes. Check your lease, but it's often acceptable.

✅ You have a period property with suspended timber floors

Foil electric systems can be installed between joists or under floating floors without the screed work wet systems require.

✅ Your project is time-sensitive

Electric mat installations take a day or two. Wet systems with screed require cure time (4–6 weeks before full load).

When to Choose Wet UFH

Wet underfloor heating is the right choice when:

✅ You're doing a new build or major renovation

The single best time to install wet UFH — pipes go in before screed, dramatically cutting labour cost and disruption.

✅ You want whole-house heating

Running electric UFH throughout a house is prohibitively expensive. Wet UFH at whole-house scale makes financial sense.

✅ You're installing a heat pump

Air source and ground source heat pumps are optimised for the low flow temperatures wet UFH requires. The two technologies are designed for each other — the Boiler Upgrade Scheme offers £7,500 towards a heat pump installation.

✅ You want the lowest long-term running costs

Especially with a heat pump, wet UFH can cut heating bills significantly versus gas boilers with radiators.

✅ You're building or renovating a large home

The upfront cost-per-m² of wet UFH decreases as the project scales. A 200m² house is much better value with wet UFH than individual electric circuits in every room.

The Hybrid Approach

Many homeowners combine both systems:

• Wet UFH downstairs (living areas, kitchen, hallway): highest efficiency, longest use
• Electric UFH in bathrooms: quick installation, targeted warmth, responsive
• Radiators upstairs (bedrooms rarely need floor heating): lower cost for rarely-used spaces

This is pragmatic and cost-effective — you get the efficiency of wet UFH where it matters most, without paying for full wet installation in every room.

Running Cost Calculator

A rough guide to annual running costs:

Electricity at 24p/kWh, gas at 6p/kWh. Actual costs depend heavily on insulation, thermostat settings, and usage patterns.

Choosing the Right Installer

Different systems require different expertise:

• Electric mats: Can be installed by a competent tiler. Electrical connection must be done by a Part P qualified electrician.
• Electric foil systems: Often straightforward enough for confident DIYers, but electrical connection still requires a qualified electrician.
• Wet UFH: Always use a specialist. Look for qualifications from APHC, CIPHE, or NICEIC accreditation. For heat pump installations, look for MCS certification.

Find local UFH installers who specialise in your system type — browse our directory by area.

Frequently Asked Questions

Is wet underfloor heating more efficient than electric?

Yes, especially when paired with a heat pump. Wet UFH runs at low temperatures very efficiently. Electric UFH converts electricity directly to heat, which is more expensive per unit of warmth than hot water systems.

Can I add wet underfloor heating to an existing home?

Yes, but it's expensive and disruptive. Retrofit overlay board systems (18–22mm depth) are less disruptive than traditional screed. Some installers use between-joist systems for suspended timber floors.

What floor coverings work with underfloor heating?

Stone and ceramic tiles are ideal — they conduct heat well and have high thermal mass. Engineered wood and LVT work well at controlled temperatures. Solid wood can be used but requires careful temperature management. Thick carpet insulates against the heat and is not recommended.

How long does it take for wet underfloor heating to heat up?

Screed systems typically take 2–4 hours to reach operating temperature from cold. Modern thermostats with weather compensation and scheduling virtually eliminate the wait by pre-heating based on forecast temperatures.

Which is better for the environment?

Wet UFH with a heat pump is significantly greener — a modern ASHP has a coefficient of performance (COP) of 3–4, meaning it produces 3–4 units of heat per unit of electricity. As the grid gets greener, so does your heating. Electric UFH is still direct resistance heating and remains carbon-intensive.

Compare installers in your area: find UFH specialists near you, or browse counties and cities.