Underfloor Heating
Installation
in Watford
Even, silent, low-temperature warmth under every square metre — designed, laid and commissioned properly, and zoned so every room heats to the temperature it should.
What underfloor heating actually covers
What it is
Wet underfloor heating (UFH) circulates warm water through pipes laid across the floor to heat the room from below. We design, install and commission systems for new builds, extensions, renovations, kitchen refits and single-room retrofits — with proper zoning, thermostatic control and pressure-tested pipework.
Who it's for
Anyone building an extension, refitting a kitchen or bathroom, converting a loft or garage, replacing tired radiators in an open-plan space, or planning ahead for a future heat pump. Works equally well with combi boilers, system boilers and air-source heat pumps.
When you need it
Best specified during a new build, extension or renovation, before flooring goes down. Single-room retrofits (using low-profile overlay boards) are also possible in kitchens and bathrooms where you're re-tiling anyway.
Why professional help matters
Radiators heat the top of the room. Underfloor heats the room evenly, at a much lower flow temperature — which means lower gas usage, quieter operation, and no cold spots. It's also the only heating type that a heat pump can drive at its most efficient setpoint without oversizing.
The cost of leaving it
Underfloor heating is a brilliant system when it's designed properly. When it isn't, it's almost impossible to fix without lifting the floor. Get the design right first time.
What can go wrong
- Pipe spacing wrong for the floor covering (e.g. carpet over 200mm centres) leaves rooms permanently cold no matter what you set the thermostat to.
- No pressure test on the pipework before the screed goes down — one nail through a pipe later and the floor comes up.
- No proper zone control means the whole floor runs whenever any room calls for heat — you either overheat rooms or fight the thermostats forever.
- Underfloor loops connected onto a normal-temperature boiler flow without a blending valve destroy the pipework and burn feet.
Common mistakes we see
- Buying a cheap online kit and asking a general builder to lay it in — UFH is design-critical, not just pipe-in-a-loop.
- Skipping proper insulation under the pipework — heat then goes downwards into the joists or slab, not into your room.
- Fitting UFH under thick carpet and heavy underlay — the tog value chokes the heat output; the floor works far below spec.
- No manifold isolation valves — a single leak means draining the whole system to fix one loop.
Our process
A clear, repeatable system — the same on every job, whether you're a homeowner or a landlord with a portfolio.
- 01
Design & heat-loss survey
We calculate room-by-room heat loss, pick loop centres for your floor covering, and design the manifold, zones and controls around your boiler or heat pump.
- 02
Fixed written quote
Insulation, pipework, manifold, actuators, wiring centre, thermostats, blending valve, commissioning and pressure test — all itemised on one line-by-line quote.
- 03
First fix
Insulation laid, pipework clipped or stapled at correct centres, loops brought back to the manifold, everything filled and pressure-tested at 6 bar before screed or overlay boards go down.
- 04
Screed / overlay
For traditional screed we hand over to your screeder with the system pressurised (so any damage is spotted immediately). For overlay retrofits we lay the panels ourselves.
- 05
Commissioning & controls
Manifold flow rates balanced, blending valve set, individual zone thermostats programmed, and a warm-up schedule handed over so you don't crack the floor on first use.
What you get
Even, silent heat
No cold spots, no rattling radiators, no wasted wall space. The floor is the emitter.
Lower running costs
Underfloor runs at much lower flow temperatures (35–45°C) than radiators (60–75°C) — that's real money off the gas or electricity bill.
Heat-pump ready
The only heating type that pairs perfectly with an air-source heat pump. Fit UFH now and you're set up for a heat pump upgrade later.
Fully zoned control
Every room on its own thermostat, so the kitchen doesn't cook while the utility room sits at 21°C.
Frees up wall space
No radiators means real freedom for kitchen layouts, extensions and open-plan living.
Pressure-tested before screed
6-bar pressure test held on the system so any pipework issue is found before the screed covers it.
Recent underfloor heating work
Photos from real jobs completed by Matt and the Premier Heating team.
In detail
We install wet UFH in three main formats: clipped into insulation for traditional wet screed pours, stapled to insulation boards for a floating screed, and low-profile overlay boards for retrofits over existing floors.
New build & extension (in-screed)
The classic approach: high-density PIR insulation across the slab, pipework clipped at 150–200mm centres, then a wet sand/cement or liquid anhydrite screed poured over the top. Gives excellent output and thermal mass — the floor stores heat and releases it slowly. Best suited to well-insulated new builds and extensions.
Retrofit (low-profile overlay)
For an existing property where you don't want to lose ceiling height, low-profile grooved insulation boards (18–20mm) sit on the existing floor with pipework routed into pre-formed channels. Tile or engineered wood goes straight over the top. Ideal for kitchens and bathrooms being re-fitted anyway.
Manifolds, blending valves and controls
Every system we install has a proper manifold with individual loop isolators, flow gauges, air vents and drain-offs — so future maintenance is possible on one loop at a time. A blending valve mixes the boiler flow down to the correct UFH setpoint. Controls are typically per-room stats wired back to a central wiring centre driving zone actuators on the manifold.
Boiler compatibility and weather compensation
UFH works with combi, system and regular boilers. On modern condensing boilers we set up weather compensation so the boiler modulates flow temperature down as outdoor temperature rises — meaning the boiler condenses (its most efficient mode) most of the year. Vaillant vSMART and similar smart controls make this straightforward.
Heat-pump ready design
If you're considering an air-source heat pump in the next few years, we can design the UFH loops, insulation and flow temperatures around the lower operating temperatures a heat pump needs — so when the heat pump goes in, you don't have to redesign the emitters.
Frequently asked questions
How much does underfloor heating cost?
Cost depends on floor area, insulation type, screed vs overlay, and controls. As a rough guide, retrofit low-profile UFH in a kitchen typically starts around £2,500–£4,500 for a mid-sized room; in-screed new-build UFH is usually costed per square metre. Every quote is written, fixed and free.
Can I have underfloor heating in one room only?
Yes. Single-room retrofits (kitchen, bathroom, en-suite, garden room) are common — we use low-profile overlay boards over the existing floor and hook the loop into your existing boiler through a small wall-mounted single-zone controller.
Does underfloor heating work with a combi boiler?
Yes. We fit a blending valve to reduce the boiler flow temperature to the correct UFH setpoint. Most modern condensing combis run happily this way — and often more efficiently than they do heating radiators.
Can I have carpet or wood over underfloor heating?
Yes — but with limits. Tile and stone are ideal (best heat transfer). Engineered wood is fine. Solid wood is possible but needs careful spec. Carpet is OK only if the combined tog of underlay + carpet stays under 2.5, otherwise output collapses.
Is it worth fitting underfloor heating now if I'll move to a heat pump later?
Absolutely — this is one of the best reasons to fit UFH. A heat pump works most efficiently at low flow temperatures, which is exactly what UFH needs. Fitting UFH now future-proofs you for a heat pump upgrade with no emitter re-work.
How long does an underfloor heating install take?
A single-room retrofit is typically 2–3 days plus flooring reinstatement. A full new-build or extension install is 1–2 weeks depending on floor area and complexity.
Do you cover my area?
Yes — we cover Watford, Northwood, Rickmansworth, Pinner, Bushey, Hatch End, Stanmore, Middlesex and Greater London. If you're nearby but not listed, please call.
Related services
Areas we cover
Based in Watford, serving Hertfordshire and Greater London.
Need something not listed? Get in touch.
Design your underfloor heating system.
Room-by-room heat loss, proper zoning, pressure-tested pipework and a 12-month workmanship guarantee.