Question 1

Which is cheaper to install — electric or wet UFH?

Accepted Answer

Electric UFH is much cheaper to install. Electric mats cost £30-60/m² installed, while wet UFH costs £50-100/m² installed (including manifold, pipework and screed). For a single room like a bathroom, electric is the clear winner. For whole-house systems, wet UFH has a higher upfront cost but significantly lower running costs.

Question 2

Which is cheaper to run?

Accepted Answer

Wet UFH connected to a gas boiler or heat pump is much cheaper to run. Electricity costs approximately 26.11p/kWh vs gas at 7.33p/kWh (Ofgem Q3 2026). A wet system running from a boiler costs roughly 30-35% as much to run as electric UFH for the same heat output. Connected to a heat pump (COP 3.0), wet UFH costs about 8.7p per kWh of heat delivered.

Question 3

How much does each system raise the floor level?

Accepted Answer

Electric UFH mats add only 3-6mm to floor height (just the mat and tile adhesive). Wet UFH typically adds 50-75mm including insulation (25mm), pipe and clips (20mm) and screed (40-50mm). Low-profile wet systems using 15mm foil plates can reduce this to 25-35mm total. Floor buildup is a critical factor in renovations with limited headroom.

Question 4

Which system heats up faster?

Accepted Answer

Electric UFH heats up much faster — typically 15-30 minutes to reach temperature. Wet UFH with a screed has high thermal mass and can take 2-4 hours to warm up from cold. This makes electric ideal for rooms used intermittently (bathrooms, en-suites), while wet UFH is better run continuously at lower temperatures for main living spaces.

Question 5

Can I use electric UFH with a heat pump?

Accepted Answer

There is no direct connection — electric UFH uses electricity while heat pump UFH uses hot water. However, surplus solar PV electricity can power electric UFH mats via a smart controller. For whole-house primary heating with a heat pump, wet UFH is the correct choice as the heat pump heats water circulated through the pipes at high efficiency.

Feature	Electric UFH	Wet (Hydronic) UFH
Install cost per m²	£30-60	£50-100
Running cost per kWh heat	~26.11p (electric rate)	~7.3-8.7p (gas/heat pump)
Floor buildup	3-6mm	50-75mm (25-35mm low-profile)
Heat-up time	15-30 minutes	2-4 hours (screed)
Installation complexity	Simple — lay mat, tile over	Complex — manifold, pipe, screed
Heat pump compatible	No (separate system)	Yes — ideal pairing
Zone control	Per-room thermostat	Manifold zone valves
Best for	Single rooms, renovations	Whole-house, new builds

Electric vs Wet Underfloor Heating

Side-by-Side Comparison

When to Choose Electric UFH

When to Choose Wet UFH

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