Is Electric Underfloor Heating Worth It in the UK or Should You Stick With Radiators?

A customer rang us last autumn - mid-renovation, tiles already ordered, contractor breathing down her neck asking for a decision by Friday and she'd read somewhere that electric underfloor heating was the "future of home heating" but her builder was pushing back hard, saying it'd double her electricity bill. Neither of them was entirely right. At Eco Friendly Heating, we've been having this exact conversation with homeowners for years, and honestly, the answer is way more situational than most articles let on.

So let's actually get into it.

What Electric Underfloor Heating Actually Costs to Run

A typical bathroom - around 4–5m² - with electric underfloor heating running on a smart thermostat for roughly 2 hours a day will use somewhere between 0.4 -- 0.6 kWh daily. In 2026 UK electricity rates are sitting around 24–25p per kWh, that's under 15p a day. Genuinely manageable. But here's where it gets complicated. The numbers shift a lot when you're talking about a 30m² open-plan kitchen, because that same logic scales to 3–4 kWh per session and if you're running it off-peak on an Economy 7 tariff you can pull the cost back, but you need to plan for it from day one, not just retrofit the habit later when the bills start hurting. The system needs to be set up with that tariff strategy in mind before a single tile goes down.

Hot take: most people googling "is underfloor heating expensive" are asking the wrong question. The better question is what room, what insulation, what tariff because without those three things the number is basically meaningless.

Why Radiators Still Win in Certain Situations

For whole-house heating in older UK properties, radiators are still the more practical choice in most cases and not just because of installation cost. Older properties with suspended timber floors are genuinely problematic for underfloor systems, the insulation requirements underneath the heating mat are really important, and if you get that wrong you're basically heating the void under your floor more than the actual room above it.

We've seen this happen. A client in a 1930s semi in Coventry installed electric underfloor heating across two reception rooms without sorting the sub-floor insulation first. His bills went up 40% and the floor never got above lukewarm. The system wasn't faulty - the installation context was just wrong, completely wrong.

And radiators heat space faster too. If you want a cold room up to temperature in 10 minutes, a well-sized radiator does that. Electric underfloor heating is a slow-burn system - it genuinely rewards people who like consistent background warmth rather than those who forget to turn the heating on until they're already sitting there in a coat.

Decision Debrief: A Bathroom Renovation in Leeds, 2024

A client came to us to renovate a family bathroom - about 6m². Options on the table were an electric underfloor heating mat under porcelain tiles for around £300 installed, or just keeping the existing heated towel rail and chucking a small portable heater in for cold mornings. He almost went with the portable heater purely on upfront cost, tbh I get it, it's the obvious cheap call.

The ongoing use of portable heaters in damp bathrooms is a safety concern (and also just... not a vibe at 6am), and a tiled floor with no underfloor warmth is genuinely miserable in a British winter. We recommended the electric mat with a programmable thermostat set to kick on 30 minutes before his morning alarm.

He messaged us three months later saying it was the best decision in the whole renovation. Unexpected bonus - the thermostat data showed the floor only needed to run about 45 minutes a day in total to stay comfortable. His actual running cost was around £8 a month...

Which, honestly, is less than most people spend on coffee at work in a week.

Where Electric Underfloor Heating Genuinely Makes Sense

When we help clients at Eco Friendly Heating work through this decision, the situations where it makes real sense tend to look like this:

• New builds or full renovations where sub-floor insulation can actually be properly sorted
• Tiled rooms bathrooms, kitchens, conservatories - where the thermal mass of tiles works in your favour
• Rooms where you want to ditch radiators for aesthetic or space reasons
• Households already on a smart tariff or actively thinking about switching to one

It rarely makes sense as a whole-house solution unless you're pairing it with a heat pump and a wet system and that's a different conversation entirely, one we can have but it's not what this is about.

Real talk: I personally think the "just do the whole house" crowd undersells how expensive running electric resistance heating at scale actually gets. A 50m² ground floor running electric mats all winter is not the same calculation as one bathroom. Not even close.

The Trade-Off Nobody Talks About Honestly

Look, the install-versus-run cost dynamic is the honest sticking point here and I'm still not 100% sold on how clearly it gets communicated in most buying guides.

Electric underfloor heating is cheap to set up relative to wet systems. A bathroom mat might be £150–300 in materials. But electricity is expensive per unit compared to gas, and that trade-off only really tips in your favour when the heated area is small, well-insulated, and used smartly with a thermostat doing the thinking for you.

Radiators, by contrast, have more ongoing flexibility. They work with whatever heat source you've got running, a gas boiler today, a heat pump tomorrow. If you're planning a full heating system switch in the next five years, locking individual rooms into electric resistance heating might not be the move. Not everyone agrees with me on this but from what I've seen, people underestimate how much their setup is gonna change in the next decade.

Still Unsure Which Direction to Go?

Okay that's not quite right as a header, because you probably do have a direction - you just want someone to confirm it or talk you out of it.

Here's the thing: the room type and floor construction will answer the question faster than any comparison article, including this one. That's exactly why Eco Friendly Heating Systems UK offers actual guidance rather than a one-size-fits-all answer because the right call for a Victorian terrace in Manchester is genuinely different from a new-build flat in Bristol, and pretending otherwise is how people end up with lukewarm floors and higher bills.

The bigger unresolved question is where UK electricity prices land over the next decade. If the grid gets cleaner and cheaper and there's reasonable cause to think it might - electric underfloor heating starts looking smarter for more situations than it does right now. But we're not there yet.

FAQs

Is electric underfloor heating expensive to run in the UK?

For small rooms like bathrooms, no - typically £8–15/month with a smart thermostat.

Can electric underfloor heating replace radiators entirely?

Rarely practical for whole-house use due to electricity costs; it works best room-by-room.

What floor types work with electric underfloor heating?

Tiles and stone are ideal; timber and carpet are possible but less efficient.

How long does electric underfloor heating take to warm up?

Usually 30–60 minutes depending on floor type and insulation quality beneath.

Is electric underfloor heating safe in bathrooms?

Yes, when installed to UK regulations (Part P) with a correct IP-rated thermostat.