--- title: "Underfloor Heating: Marlborough, Calne & Wiltshire | BTD" description: "Wet underfloor heating design and installation across Marlborough, Calne, Swindon and rural Wiltshire. New builds, extensions and retrofits. Manifolds, controls, commissioning." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "PlumbingService", "name": "BTD Plumbing & Heating", "image": "/__l5e/assets-v1/5c2a8a57-5312-4450-b2c7-21ccea3eb146/btd-favicon.png", "url": "/", "telephone": "07920 042880", "email": "info@btdplumbingheating.co.uk", "priceRange": "££", "address": { "@type": "PostalAddress", "streetAddress": "Pye Lane", "addressLocality": "Broad Town", "addressRegion": "Wiltshire", "postalCode": "SN4 7RR", "addressCountry": "GB" }, "geo": { "@type": "GeoCoordinates", "latitude": 51.498686, "longitude": -1.8718 }, "openingHoursSpecification": [ { "@type": "OpeningHoursSpecification", "dayOfWeek": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" ], "opens": "00:00", "closes": "23:59" } ], "sameAs": [ "https://www.facebook.com/btdplumbingandheating" ], "areaServed": [ { "@type": "City", "name": "Broad Town" }, { "@type": "City", "name": "Royal Wootton Bassett" }, { "@type": "City", "name": "Broad Hinton" }, { "@type": "City", "name": "Lyneham" }, { "@type": "City", "name": "Wroughton" }, { "@type": "City", "name": "Marlborough" }, { "@type": "City", "name": "Yatesbury" }, { "@type": "City", "name": "Swindon" }, { "@type": "City", "name": "Calne" } ] }, { "@context": "https://schema.org", "@type": "WebSite", "name": "BTD Plumbing & Heating", "url": "/", "publisher": { "@type": "Organization", "name": "BTD Plumbing & Heating", "logo": "/__l5e/assets-v1/5c2a8a57-5312-4450-b2c7-21ccea3eb146/btd-favicon.png" }, "potentialAction": { "@type": "SearchAction", "target": "/services?q={search_term_string}", "query-input": "required name=search_term_string" } }, { "@context": "https://schema.org", "@type": "Organization", "name": "BTD Plumbing & Heating", "url": "/", "logo": "/__l5e/assets-v1/5c2a8a57-5312-4450-b2c7-21ccea3eb146/btd-favicon.png", "contactPoint": [ { "@type": "ContactPoint", "telephone": "07920 042880", "contactType": "customer service", "areaServed": "GB", "availableLanguage": [ "en-GB" ] } ], "sameAs": [ "https://www.facebook.com/btdplumbingandheating" ] }, { "@context": "https://schema.org", "@type": "Service", "name": "Underfloor Heating", "serviceType": "Underfloor Heating", "description": "Wet underfloor heating design and installation across Marlborough, Calne, Swindon and rural Wiltshire. New builds, extensions and retrofits. Manifolds, controls, commissioning.", "provider": { "@type": "LocalBusiness", "name": "BTD Plumbing & Heating", "telephone": "07920 042880", "email": "info@btdplumbingheating.co.uk", "address": { "@type": "PostalAddress", "streetAddress": "Pye Lane", "addressLocality": "Broad Town, Swindon", "addressRegion": "Wiltshire", "postalCode": "SN4 7RR", "addressCountry": "GB" } }, "areaServed": [ "Broad Town", "Royal Wootton Bassett", "Broad Hinton", "Lyneham", "Wroughton", "Marlborough", "Yatesbury", "Swindon", "Calne" ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much does underfloor heating cost?", "acceptedAnswer": { "@type": "Answer", "text": "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." } }, { "@type": "Question", "name": "How long does installation take?", "acceptedAnswer": { "@type": "Answer", "text": "A typical single-zone extension is 1–2 days for the underfloor plumbing itself (plus your builder's screed and floor finishing time). A full ground-floor system in an average home is 3–5 days on the plumbing side." } }, { "@type": "Question", "name": "Can I add underfloor to just one room?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: kitchens, utilities, bathrooms and extensions are the most common single-zone additions. Retrofit systems make this straightforward without lifting the ceiling below." } }, { "@type": "Question", "name": "Will it work with my existing boiler?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, in the vast majority of cases, with a correctly sized blending valve and controls. We'll confirm boiler output and pump capacity at survey." } }, { "@type": "Question", "name": "Is underfloor heating expensive to run?", "acceptedAnswer": { "@type": "Answer", "text": "No: a correctly designed system usually runs cheaper than an equivalent radiator system, because the boiler stays in its efficient condensing band." } }, { "@type": "Question", "name": "How long before I can walk on the floor?", "acceptedAnswer": { "@type": "Answer", "text": "That's a screed-cure question, usually 24–48 hours for foot traffic on a properly laid screed, longer before the underfloor is warmed up. We coordinate the warm-up schedule with the screed manufacturer's guidance." } }, { "@type": "Question", "name": "Can it be zoned with different room thermostats?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: every loop can be zoned independently. Kitchen, utility and bathroom running to their own schedules is the norm." } }, { "@type": "Question", "name": "Is it OK to tile / put wood flooring on top?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: porcelain and stone tile are the most efficient. Engineered wood is compatible if the manufacturer confirms it. Solid timber floorboards are generally not recommended over UFH." } }, { "@type": "Question", "name": "What if there's a leak in the pipework?", "acceptedAnswer": { "@type": "Answer", "text": "Continuous pipe loops with no joints under the screed mean leaks are very rare. Every loop is pressure-tested before screed goes down and left under pressure during the cure, punctures caught before they're buried." } }, { "@type": "Question", "name": "Do you cover my area?", "acceptedAnswer": { "@type": "Answer", "text": "Marlborough, Calne, Royal Wootton Bassett, Swindon, Broad Town, Wroughton, Lyneham, Broad Hinton, Yatesbury and surrounding villages." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://btdplumbingheating.co.uk" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://btdplumbingheating.co.uk/services" }, { "@type": "ListItem", "position": 3, "name": "Underfloor Heating", "item": "https://btdplumbingheating.co.uk/services/underfloor-heating" } ] } ] --- Open 24/7 · 7 days a week [info@btdplumbingheating.co.uk](mailto:info@btdplumbingheating.co.uk) [07920 042880](tel:07920042880)[](https://www.facebook.com/btdplumbingandheating) [![BTD Plumbing & Heating](/__l5e/assets-v1/61f32ae6-1a6e-43c3-b1ad-85dbc02e87a2/btd-logo.png) ](/) [Home](/)[About](/about) [Services](/services) [Service Areas](/areas) [Our Work](/our-work)[Reviews](/reviews)[Contact](/contact) [07920 042880](tel:07920042880) [](tel:07920042880) ![Copper pipework being brazed in situ beneath floor joists during an underfloor heating first-fix](/__l5e/assets-v1/587a680c-2e52-45e7-82ce-55e5fc590cb7/work-25.jpg) 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](#quote) [07920 042880](tel:07920042880) 18 years' experience · Manifold-balanced · Compatible with oil and gas boilers 1. [Home](/) 2. [Services](/services) 3. 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 is Design, 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 for Homeowners 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 it When 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 matters Underfloor 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 1. 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. 2. Step 2 Manifold and control selection Right number of ports for your zones, correct actuators, thermostats and, where needed, weather-compensating controls. 3. 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. 4. 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. 5. 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](tel:07920042880) 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? ![Zoned central heating manifold with low-loss header and multiple circulator pumps installed by BTD](/__l5e/assets-v1/fd044ba2-ab75-43f3-b2a9-47d21fc77e28/work-11.jpg) 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 042880](tel:07920042880)[Request a Free Quote]() Related services ## Often booked alongside Underfloor Heating [All services](/services) [ Central Heating Systems ](/services/heating)[ Oil Boiler Installation ](/services/oil-boiler-installation)[ Gas Boiler Installation ](/services/gas-boiler-installation) ![BTD Plumbing & Heating](/__l5e/assets-v1/61f32ae6-1a6e-43c3-b1ad-85dbc02e87a2/btd-logo.png) Oil-fired heating specialists and fully qualified gas engineers, serving Broad Town and rural Wiltshire since 2007. [](https://www.facebook.com/btdplumbingandheating)[Leave a review](https://search.google.com/local/writereview?placeid=ChIJRZWCvZdDcUgRtf3uEv2z_ME) ### Services - [Oil Boiler Servicing](/services/oil-boiler-servicing) - [Oil Boiler Repairs](/services/oil-boiler-repairs) - [Oil Boiler Installation](/services/oil-boiler-installation) - [Gas Boiler Servicing](/services/gas-boiler-servicing) - [Gas Boiler Repairs](/services/gas-boiler-repairs) - [Gas Boiler Installation](/services/gas-boiler-installation) - [Water Softener Installation](/services/water-softener) - [Central Heating Systems](/services/heating) - [All services →](/services) ### Service Areas - [Broad Town](/areas/broad-town) - [Royal Wootton Bassett](/areas/royal-wootton-bassett) - [Broad Hinton](/areas/broad-hinton) - [Lyneham](/areas/lyneham) - [Wroughton](/areas/wroughton) - [Marlborough](/areas/marlborough) - [Yatesbury](/areas/yatesbury) - [Swindon](/areas/swindon) - [Calne](/areas/calne) ### Contact - [07920 042880](tel:07920042880) - [info@btdplumbingheating.co.uk](mailto:info@btdplumbingheating.co.uk) - Pye Lane, Broad Town, Swindon, SN4 7RR Gas Safe Reg. 529962 OFTEC Reg. 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