Open 24/7 · 7 days a week info@btdplumbingheating.co.uk 07920 042880 HomeAboutServices Service Areas Our WorkReviewsContact07920 042880 Even, silent, efficient heat # Wet underfloor heating,designed and commissioned to run right New-build zones, extensions and full retrofit underfloor heating, designed around your flooring build-up, plumbed with the correct pipework, balanced at the manifold and commissioned properly. Request a Free Quote 07920 042880 18 years' experience · Manifold-balanced · Compatible with oil and gas boilers - Home - Services - Underfloor Heating - 18 years Experience - £2m cover Public liability - Pressure & flow Pipework tested - Fully valid Warranty - Free Written quote Overview ## A straight explanation of what we do, and why it matters Done well, wet underfloor heating is the quietest, most comfortable, most efficient way to heat a room. Done badly, it's a permanent, unfixable disappointment sealed under a tiled floor. Back to home What it isDesign, installation and commissioning of wet (hydronic) underfloor heating, single-zone extensions, multi-zone whole-house systems, retrofits over existing floors and new-build slabs. Manifolds, actuators, thermostats, zoning and boiler integration. Who it's forHomeowners across Marlborough, Calne, Royal Wootton Bassett, Swindon, Broad Town, Wroughton and the wider rural Wiltshire area, kitchen and utility extensions, full ground-floor retrofits, new-builds and barn conversions. When you need itWhen you're extending, refitting a kitchen or bathroom, replacing floors or building new. Also the right moment when a room is stubbornly cold and radiators can't be sized properly for the wall space available. Why professional mattersUnderfloor delivers a lower, more even flow temperature to a much larger emitting surface than a radiator ever can, which means condensing boilers stay in the condensing band for far more of the year. That's where the efficiency comes from. But it only works when the design, pipe spacing, insulation, screed and controls are all right. The cost of leaving it ## What happens when it's ignored Underfloor heating that doesn't work is often the most expensive DIY story we hear. Risks & escalations - Wrong pipe spacing gives cold stripes across the room, visible on a thermal camera, permanent to fix. - No or poor insulation under the pipework sends most of the heat downwards into the ground. - Wrong screed depth or type gives thermal lag so long the system can't respond to weather changes. - Undersized manifold or missing balancing valves leaves the far-corner room cold forever. - Direct connection to a boiler running 70°C+ flow temperature will crack most types of screed. A blending valve isn't optional. Common mistakes - Buying an underfloor 'kit' online and hoping the tiling team lays it right. - Skipping the pressure test before screeding. A pin-prick puncture found after the tiles are down is a nightmare. - Using room stats intended for radiators with actuators that never quite match. Poor comfort and constant cycling. - Adding underfloor to an existing high-temperature system without a proper blending set. Either the underfloor overheats and cracks the screed or the radiators run cold. It's a system that rewards proper design and installation, and punishes shortcuts, permanently. Our process ## A clear, five-step system, no surprises - Step 1 Design and heat-loss calculation Per-room heat loss, pipe spacing and loop lengths designed to deliver the required output at low flow temperature. - Step 2 Manifold and control selection Right number of ports for your zones, correct actuators, thermostats and, where needed, weather-compensating controls. - Step 3 Pipework installation and pressure test PE-RT / PE-Xa pipe pinned or clipped to spec, tails brought back cleanly to the manifold, pressure-tested before screed goes down. - Step 4 Screed compatibility and warm-up schedule Correct screed depth, cure time and initial warm-up schedule to avoid cracking | coordinated with your builder or tiler. - Step 5 Commissioning and balance Each loop balanced individually at the manifold, controls set up, walk-through with you, everything written up. The benefits ## Concrete outcomes, not vague promises Even, quiet warmth No radiators to work around, no visible plumbing, no cold spots | one big radiator across the whole floor. Efficient with modern boilers Low flow temperatures keep condensing boilers in their condensing band far more of the year | real fuel savings. Room-by-room control Multi-zone control means the kitchen, utility and bathroom can each run to their own schedule and temperature. Wall space back Freeing walls of radiators and pipework opens up kitchen, bathroom and living-room design options. Pressure tested before screed Every loop hydraulically tested and left under pressure while screed cures | leaks caught before they're buried. Boiler integrated properly Blending valve, correct flow temperature, controls integrated with existing radiators. Not a bolt-on. In detail ## The technical stuff, explained straight Where the theory meets the van. Materials, methods, brand differences and the specific situations we deal with week in, week out across Wiltshire. ### Screed builds vs low-profile retrofit systems New-build and extension jobs typically use a sand-and-cement or liquid screed poured over pipework laid on insulation. That builds a substantial thermal mass, slow to warm but very stable once running. Retrofit systems (aluminium spreader plates, or low-profile pipe-in-panel products laid over existing floors) allow underfloor heating to be added to a room without lifting the floor structure, thinner build-up, faster response, slightly higher flow temperatures required. We'll advise on which is right for your build-up at survey. ### Manifolds, blending and controls The manifold is the brain of an underfloor system. Each loop connects individually with a flow meter (for balancing) and an actuator (driven by that zone's thermostat). A blending valve mixes hot flow from the boiler with cooler return water to hold the underfloor flow temperature at the correct, low value (typically 35–45°C). Get the blending wrong and either the floor is cold or the screed is at risk. Controls range from simple room thermostats up to weather-compensating multi-zone systems that talk to modern boilers. ### Underfloor with oil boilers Modern condensing oil boilers integrate cleanly with wet underfloor heating via a blending set. The low flow temperature and constant modest demand actually keeps a condensing oil boiler running efficiently through the shoulder months when a radiator-only system would short-cycle. A very common upgrade in Wiltshire is a new oil boiler paired with new ground-floor underfloor heating, done together, one visit, one warranty. ### Underfloor with gas boilers Same story, gas side. Modulating condensing gas boilers deliver excellent performance at underfloor flow temperatures. Where an existing gas system has both radiators (upstairs) and underfloor (downstairs), we install a two-temperature manifold or a two-port zoning arrangement so each side runs at its correct temperature, a common source of comfort problems when done as a botched retrofit. ### New build, extension and retrofit differences New build: full design freedom, correct insulation depth, proper screed. New extension: coordinate with builder for insulation and screed thickness; brought back to a new or extended manifold. Retrofit: low-profile panels or spreader-plate systems suit existing joisted or solid floors; expect slightly higher flow temperatures than a full slab system, and take insulation seriously, otherwise you're heating the floor void. We'll be honest at survey about what a specific room can realistically deliver. FAQs ## The questions we're asked most Can't see yours? Give us a ring; we don't do sales scripts. Call 07920 042880 How much does underfloor heating cost?Depends on floor area, zones, boiler integration and whether it's new build, extension or retrofit. We survey then quote in writing. Free, no obligation. How long does installation take? Can I add underfloor to just one room? Will it work with my existing boiler? Is underfloor heating expensive to run? How long before I can walk on the floor? Can it be zoned with different room thermostats? Is it OK to tile / put wood flooring on top? What if there's a leak in the pipework? Do you cover my area? Free written quote · no pressure ## Thinking about underfloor heating? Get it designed properly. Book a free survey. We'll walk the room with you, talk build-ups honestly and quote in writing. - Gas Safe 529962 - OFTEC C11108 - 18 years' experience 07920 042880Request a Free Quote Related services ## Often booked alongside Underfloor Heating All services Central Heating Systems Oil Boiler Installation Gas Boiler Installation Oil-fired heating specialists and fully qualified gas engineers, serving Broad Town and rural Wiltshire since 2007. Leave a review ### Services - Oil Boiler Servicing - Oil Boiler Repairs - Oil Boiler Installation - Gas Boiler Servicing - Gas Boiler Repairs - Gas Boiler Installation - Water Softener Installation - Central Heating Systems - All services → ### Service Areas - Broad Town - Royal Wootton Bassett - Broad Hinton - Lyneham - Wroughton - Marlborough - Yatesbury - Swindon - Calne ### Contact - 07920 042880 - info@btdplumbingheating.co.uk - Pye Lane, Broad Town, Swindon, SN4 7RRGas Safe Reg. 529962 OFTEC Reg. C11108 · Tech. 28212 City & Guilds Qualified Grant UK G1 Approved Installer © 2026 BTD Plumbing & Heating. All rights reserved. AboutContactPrivacyTermsCookiesOpen 24/7 · Mon–Sun Call NowRequest Quote