Open 24/7 · 7 days a week info@btdplumbingheating.co.uk 07920 042880 HomeAboutServices Service Areas Our WorkReviewsContact07920 042880 Whole-system heating # Central heating design,installed and upgraded properly New central heating systems, full radiator upgrades, cylinder replacements and control retrofits, designed around your home, installed to last, priced clearly in writing. Request a Free Quote 07920 042880 Gas Safe & OFTEC registered · 18 years' experience · Written quote before work - Home - Services - Central Heating Systems - 529962 Gas Safe reg. - C11108 OFTEC reg. - 18 years Experience - £2m cover Public liability - Free Written quote Overview ## A straight explanation of what we do, and why it matters A central heating system that runs quietly, warms every room evenly and doesn't bankrupt you on fuel isn't luck; it's design. Sized correctly, plumbed cleanly, controlled properly. Back to home What it isFull central heating design, installation and upgrades, new systems, radiator changes, cylinder replacements, control retrofits, zoning, and moving from vented to sealed systems. Oil and gas. Who it's forHomeowners upgrading or extending across Broad Town, Royal Wootton Bassett, Marlborough, Calne, Swindon and the wider rural Wiltshire area, whether adding radiators for an extension, replacing a tired old system, or moving from a solid-fuel or immersion-only setup. When you need itWhen cold rooms have become a family argument, when a new extension needs adding to the system, when the existing pipework is undersized, when radiators are the ugly old sort, or when the whole setup is simply overdue. Why professional mattersA well-designed heating system pays back every day it runs, in comfort, in fuel savings and in the boiler breakdowns that never happen. A tacked-together one costs quietly, every day, for years. The cost of leaving it ## What happens when it's ignored Cold rooms and high fuel bills aren't 'just how the house is'. They're a system problem, and system problems have solutions. Risks & escalations - Undersized radiators leave rooms cold, drive up thermostat demand and make the boiler run harder for longer. - Old, sludged pipework blocks flow and starves upstairs radiators. Long-term, it wrecks new boilers. - Poor controls leave you paying to heat empty rooms at night. - Vented systems in loft tanks can freeze, overflow and cause thousands of pounds of ceiling damage in a cold snap. - Undersized cylinders leave a family with hot water for one shower and lukewarm for the next. Common mistakes - Adding an extension onto the existing system without checking flow rates and radiator sizing. - Assuming a bigger boiler will fix cold radiators. Usually it's the radiators, the pipework or the flow, not the output. - DIY'ing radiator swaps and inheriting an air-locked, half-drained mess. - Leaving 20-year-old TRVs on a new system. Half won't be sealing; most won't be responding to temperature properly. The good news: most heating problems have a diagnosable, fixable cause. We'll walk the system with you and tell you exactly what's going on. Our process ## A clear, five-step system, no surprises - Step 1 System survey Walk the property, room by room. Radiator sizes, pipework routes, boiler output, controls, cylinder capacity, cold-spot analysis. - Step 2 Heat-loss design Proper heat-loss calculations for each room drive radiator sizing, boiler output and flow-temperature design. - Step 3 Written quote & options A clear breakdown | options for radiator style, controls, cylinder type and boiler pairing | with a fixed installation price. - Step 4 Clean install Pipework routed neatly, joints cleaned, filters and inhibitor fitted, system pressure-tested and flushed before commissioning. - Step 5 Commissioning and balance Every radiator individually balanced for even flow, controls set up properly, walk-through with you, warranty registered. The benefits ## Concrete outcomes, not vague promises Warm rooms, evenly Correctly sized radiators and a balanced system mean the boiler works less and the rooms feel better. Real fuel savings Modern controls, sensible flow temperatures and TRVs typically cut heating fuel by 15–25%. Longer boiler life Clean system water, magnetic filter, correct inhibitor | the three things that keep a modern boiler alive. Tidy pipework Runs planned, boxed and finished properly | not left dangling and 'we'll come back to that'. Warranty protected Every install carried out to manufacturer specification and Building Regs, with paperwork on file. One engineer Design, install, commission and after-sales | all Ben. Nothing lost in handoffs. 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. ### Radiator design | the part most people skip A well-designed heating system starts at the radiators, not the boiler. Every room's heat loss depends on external walls, ceiling type, floor construction, window area and desired temperature. Correctly sized radiators warm the space at a sensible flow temperature (55–65°C in most modern systems), letting the boiler modulate and condense properly. Undersized radiators force higher flow temperatures, which stops condensing boilers from condensing, and immediately costs you double-digit percentage points of efficiency. We size radiators room by room, not by rule of thumb. ### Sealed vs vented systems Most modern installations are sealed, pressurised with an expansion vessel, no loft tanks. Cleaner, safer, no risk of loft-tank overflow. Vented systems (with a feed-and-expansion tank) are still valid on older regular-boiler set-ups, and we service and repair plenty. Converting from vented to sealed at the same time as a new boiler is a common upgrade and often makes long-term sense, but not always. We'll advise honestly at survey. ### Cylinders | vented, unvented and G3 Unvented cylinders (mains-pressure hot water, no loft tank) deliver strong, balanced hot water to multiple outlets simultaneously, ideal for family homes with two or three bathrooms. They require G3 unvented-competent installation, annual safety checks and specific discharge pipework, all of which we're qualified for and hold current registration on. Vented cylinders remain a solid, low-maintenance option where mains pressure is poor or a loft tank is easy to keep. ### Controls, zoning and modern efficiency The biggest efficiency wins in most Wiltshire homes come from controls, not the boiler. Zoning heating so that upstairs and downstairs can run to different times and temperatures typically saves 10–20% of heating fuel. TRVs on every radiator (bar the one in the room with the thermostat) prevent overheating. Weather compensation reduces the boiler flow temperature on mild days, unlocking more condensing hours. Smart thermostats give useful holiday control and per-zone scheduling. All of it can be added to an existing system in a day or two, no full replacement required. ### Extensions, additions and system rebalancing Adding radiators to an existing system without recalculating flow rates and rebalancing is a common cause of cold upstairs radiators. When you extend a heating system we survey the whole thing, not just the new bits, and rebalance every radiator on completion. A ten-minute job that most 'add-a-radiator' installers skip and everyone lives with for years. 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 a new central heating system cost?Every property is different, number of radiators, cylinder or combi, pipework accessibility and controls all shift the price. We survey, then quote in writing. Free, no obligation. How long does a new heating system take to install? Can I add a radiator to my existing system? Do you install unvented cylinders? Can you zone my heating between upstairs and downstairs? Do I need a power flush before upgrading? Do you replace old radiators? Can you install underfloor heating instead of / alongside radiators? Do you cover my area? Is there a guarantee? Free written quote · no pressure ## Cold rooms or a tired old heating system? Let's fix it properly. Book a free survey and get a written, honest quote. No sales patter, no upsell, no obligation, just a straight answer. - Gas Safe 529962 - OFTEC C11108 - 18 years' experience 07920 042880Request a Free Quote Related services ## Often booked alongside Central Heating Systems All services Underfloor Heating Power Flushing 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