Renting with Underfloor Heating: What to Expect (UK Guide 2026)

Moving in without a say in the system

If you’ve only ever lived with radiators, moving into a rental with underfloor heating (UFH) as the only heat source is a bit of a leap into the unknown. You don’t get to choose the system, you often don’t get much choice over the settings either, and landlords tend to have a stock answer: “we keep it around 18°C to manage costs.” That’s not usually a brush-off. It’s actually how UFH is meant to be run. But it does mean you’re inheriting someone else’s setup rather than dialling in your own, so it’s worth understanding what you’re actually getting before winter tests it.

For the basics of how the two main system types work, see our beginner’s guide to underfloor heating.

Why 18°C on underfloor heating doesn’t feel like 18°C on a radiator

This is the biggest adjustment for anyone coming from radiators. A radiator heats the air around it, so when you walk into a cold room and switch one on, you get a noticeable blast of warmth within a few minutes. Underfloor heating doesn’t work that way. It warms the floor’s mass and radiates heat upward slowly and evenly, which means there’s no “blast” to notice, and if it’s been sitting at a steady 18°C, that’s roughly what the room has felt like all day, not a temperature it’s climbing towards.

Most people find this comfortable once they’ve adjusted, because radiant heat from below feels warmer than the same air temperature from a wall-mounted radiator (your feet aren’t cold, and the heat doesn’t collect near the ceiling the way convected heat does). But the first week or two can feel flat if you’re expecting that familiar rush of warmth when you walk in from outside. Give it longer than a day or two before deciding it’s not warm enough.

Is your landlord’s “low and constant” approach actually cheaper?

You may have seen advice saying that leaving heating on low all day costs more than turning it on only when needed; that’s broadly true, and it’s good general advice for radiator-based central heating. It is not true for underfloor heating built into a concrete or screed floor, and this is genuinely one of the few cases where the opposite advice applies.

A wet UFH slab has a huge amount of thermal mass. Heating it from cold takes hours, and once it’s warm it holds that heat for hours after the system switches off. Cycling a system like that on and off wastes energy fighting its own thermal lag, so the standard professional recommendation for slab-based wet UFH is exactly what your landlord described: set it to a steady background temperature and leave it running, rather than switching it on and off like a radiator. If your system is electric rather than wet, this matters less, since electric mats respond faster, but it’s still generally more efficient to avoid big swings.

So the “18°C constant to keep costs low” line isn’t a landlord being tight-fisted; it’s the right way to run this specific type of system. For more on how running costs actually break down between system types, see our guide to underfloor heating running costs.

Wet or electric? It changes what you can actually do

Before you plan around the system, find out which type you have, because it changes both your options and your risk if you do decide to push the temperature up:

• Wet (hydronic) systems, run off a boiler or heat pump through pipes in the floor, are slow to respond. Turning the thermostat up won’t produce a noticeable change for hours, so day-to-day tweaking is largely pointless. Set a temperature and judge it over several days, not a single evening.
• Electric systems, using heating cables or mats, respond much faster but cost considerably more to run per hour, since you’re paying electricity rates directly rather than a boiler’s gas rate. If your landlord is on an electric system and mentioned “extra costs are on you,” check what you’re actually paying per degree before pushing it up for the whole flat.

See our full comparison in electric vs water underfloor heating if you want the detail.

Staying warm without touching the thermostat

Since you likely can’t (or shouldn’t) fiddle with the system daily, most of your comfort gains will come from everything around it rather than the heating itself:

• Go easy on rugs. A thick rug over a heated floor insulates it, which sounds cosy but actually blocks the heat from reaching the room; you end up with a warm rug and a cooler room than you’d have with nothing down at all. If you want rugs, keep them thin, and avoid covering large areas of a heated zone.
• Curtains and draught-proofing matter more here than with radiators. A radiator can compensate for heat loss around a draughty window by blasting out more heat on demand. UFH can’t do that; it’s running at a fixed, gentle output, so heat lost through gaps and glass isn’t easily made up elsewhere. A draught excluder under the door or thicker curtains will do more for comfort than most other adjustments.
• An electric blanket for the bed is worth it. Bedrooms are usually kept cooler than living spaces even with UFH (16–19°C is the typical range recommended for adult bedrooms), and it’s far cheaper to warm the bed directly than to push a whole zone up a couple of degrees just for bedtime.
• Furniture placement matters more than people expect. A sofa or bed sitting directly over a heated section blocks output in exactly the spot you want it, similar to the rug problem. Check for warm patches on the floor and try not to fully block them with large furniture where you can help it.

When it’s not just “getting used to it”

Feeling a bit cool for the first week is normal. These aren’t:

• Persistent condensation on windows or walls. Underfloor heating run too low in a poorly ventilated room can tip into the range where condensation and damp start to form, particularly in older or less insulated properties. This is worth flagging to your landlord rather than just opening a window and hoping.
• One room or zone that never warms up at all while others do. That’s a fault, not a setting, and should be reported. Our troubleshooting guide covers what a working system should feel like if you want to compare notes before raising it.
• The floor feeling hot in patches rather than gently warm. That can indicate a system fault or, in electric systems, a damaged element, and is worth reporting rather than living with.

Know where you stand legally

UK housing law sets minimum standards landlords must meet, including that a home must be capable of being kept warm enough to avoid harm to health, and 18°C is a commonly referenced benchmark for vulnerable occupants in official guidance. The exact legal obligations depend on your tenancy and circumstances, so if you’re unsure whether what you’re being offered meets the standard, Shelter and gov.uk have up-to-date guidance on landlord repairing and heating obligations. This isn’t legal advice, just a starting point for checking your specific situation.

FAQs

Is 18°C warm enough with underfloor heating?

For most people, yes, once you’ve adjusted to how radiant heat feels compared with a radiator, though it can feel cool in the first few days. If it consistently feels cold or you’re seeing condensation, that’s worth raising with your landlord rather than assuming it’s just the system.

Is it cheaper to leave underfloor heating on low all day?

For wet, slab-based systems, yes, this is standard advice and different from the usual “only heat when needed” guidance for radiators, because of how slowly the slab heats and cools. For electric systems the case is weaker, since they respond quickly and don’t carry the same thermal mass.

Do rugs stop underfloor heating from working?

They don’t stop it outright, but a thick rug insulates the floor and reduces how much heat actually reaches the room, so it’s counterproductive in a heated zone. Keep rugs thin or avoid them over the areas you most want warm.

Can I use an electric blanket alongside underfloor heating?

Yes, and it’s usually the cheapest way to add targeted warmth, particularly in a bedroom kept cooler than the rest of the flat.

What temperature should each room actually be?

As a rough guide, living rooms are typically run at 20–22°C, bathrooms 22–24°C, and adult bedrooms 16–19°C. Your landlord’s 18°C figure sits in the middle of that range and is a reasonable whole-flat baseline rather than an unusually low setting.