Carterton, Oxfordshire, serving Witney, Oxford & the Cotswolds admin@pinnacle-plumbing.co.ukMon–Fri 8:30–5 · Sat & Sun emergency call-outs only AboutServicesGeneral Plumbing Repairs & MaintenanceEmergency Plumber & Call-OutsBoiler Installation & ReplacementBoiler Servicing & Gas SafetyBoiler Repairs & BreakdownsCentral Heating & Underfloor HeatingBathroom Renovations & InstallationsAir Source Heat Pumps & RenewablesLandlord Gas Safety Certificates (CP12)Estate & Letting Agent SupportNew Build & Development PlumbingRadiator & Valve Work Something not listed? Just ask — we take on most plumbing & heating work. View all → AreasWitneyCartertonOxfordOxfordshireAbingdonBicesterCotswoldsWoodstockMoreton-in-Marsh We also work outside these areas, including larger projects further afield. View all → Our WorkReviewsContact01865 306381Get a Free Quote New Boilers From £2,000 — 7+ years warranty, free fixed-price quote Get my quote Home/Services/Central HeatingCentral Heating · Witney, Oxford & Oxfordshire # Central Heating & UnderfloorHeating in Witney, Oxford& the Cotswolds. System upgrades, radiator installs, cylinder swaps, chemical cleans and wet underfloor heating designed and installed to work as one system, not a boiler stuck on top of tired pipework. Get a Free QuoteCall 01865 306381 Whole-system design, not just swapsWet UFH for extensions & new buildsFull chemical clean on every install Gas Safe Registered Every gas engineer individually qualified 10+ Years Company directors in the trade Growing Team Engineers on the road across Oxfordshire Up to 10-Yr Warranty On approved boiler installs £5m Public Liability Fully insured on every job What we do ## Central Heating, explained properly. What it is Central heating covers everything downstream of the boiler: pipework, radiators, valves, controls, cylinders and, increasingly in Oxfordshire renovations, wet underfloor heating loops. We design, upgrade, clean and service the whole system. Who it's for Homeowners renovating, extending or futureproofing their heating; landlords rebalancing tired systems; and property owners planning a heat pump switch who need the emitters sized for lower flow temperatures. When you need it When rooms won't warm evenly, when radiators are cold at the bottom, when you're extending or converting a loft, when you're preparing for a heat pump, or when your system is over 20 years old and full of magnetite sludge. Why a qualified team matters Modern heating design is a hydraulic and thermal calculation, not guesswork. Undersized emitters, poorly balanced systems, and blocked pipework waste gas and shorten boiler life. Done properly, the whole property warms faster on less fuel. What happens if it's left ## The cost of ignoring it. The commonest heating complaint in Oxfordshire is 'the boiler is fine, but the house never warms evenly', and that is almost always a system problem, not a boiler problem. ### Sludged pipework Magnetite build-up throttles flow, cooks pumps, blocks heat exchangers and can void a new boiler's warranty inside a year. ### Cold radiators upstairs Poor balancing and airlocks starve upper-floor rads. Adding more inhibitor doesn't fix it, proper commissioning does. ### Under-sized emitters Radiators sized for an old 80°C system won't keep a room warm on a heat pump running at 45°C. Undersized emitters trap you on gas forever. ### High running costs A badly balanced system runs the pump on max, the boiler at high fire, and still delivers uneven heat. You pay for the inefficiency every month. ### Common mistakes we see - •Adding a new boiler onto a system that's never been flushed - •Replacing radiators like-for-like without recalculating room heat loss - •Skipping the magnetic filter, the single cheapest lifetime protection - •Ignoring cold-at-bottom radiators (a classic sludge warning sign) - •Fitting underfloor heating without a manifold-level balancing plan Our process ## How we run the job. - 01 ### Heat loss survey Room-by-room heat loss calc, the basis for correctly sized radiators, cylinder, UFH loops and pipework. - 02 ### Design & fixed-price quote System schematic, emitter sizing, control strategy, cylinder sizing where relevant. Priced in writing. - 03 ### Install & upgrade New pipework where needed, new emitters, cylinder, controls, manifolds for UFH. Existing kit preserved where sound. - 04 ### Chemical clean & fill Full flush, magnetic filter, Fernox F1 inhibitor. Heavily contaminated systems get an extended clean. - 05 ### Commission & balance Every radiator balanced with lockshields, TRVs set, controls paired, UFH loop flow rates set at the manifold. Handover documented. Benefits ## What you actually get. ### Even, comfortable heat Every room reaches setpoint at roughly the same rate, no more running the whole house hot to warm one bedroom. ### Lower gas usage Correct sizing and balancing lets the boiler modulate down. Modulation is where the efficiency lives. ### Longer boiler life Clean, balanced systems don't destroy pumps, diverters or heat exchangers. Your investment lasts. ### Heat-pump-ready design We can design emitters and pipework now that will work later on a low-temperature heat pump, no rip-and-replace. ### Quiet operation Correctly sized pumps and de-aerated systems run silent. No kettling, no gurgling, no banging pipes. ### Documented handover Balance settings, control layout and system schematic left with you, not in an engineer's head. Recent work ## Real central heating jobs, real Oxfordshire homes. See full portfolio The detail ## Depth, not filler. Central heating design is where most Oxfordshire homes lose the most money, and where a considered upgrade pays back fastest. ### Radiators Type 22 double-panel double-convector for most rooms, Type 21 or 11 in tight spaces, low-surface-temperature for schools/care, vertical designer rads for hallways. Sized to room heat loss, not eyeballed. ### Pipework 22mm and 15mm copper for retrofits, 22mm/16mm PEX-Al-PEX in screed for UFH, correct velocity for silent operation. ### Controls Room stat + TRVs at minimum; ideally weather compensation on modern Vaillant/Worcester boilers, and multi-zone control on larger homes. ### Cylinders Unvented stainless cylinders (Megaflo, Telford Tempest) for high-flow multi-bathroom homes; vented copper where mains pressure is poor; twin-coil for future solar or heat pump integration. ### Underfloor heating Wet UFH in screed for new builds and extensions, low-profile UFH systems for retrofit on suspended floors, thermostatic manifolds with actuators tied into zone controls. ### System cleaning & chemical flushes Chemical cleans and magnacleanse for heavily sludged systems and pre-boiler-replacement prep. Adey MagnaClean or Fernox TF1 filter fitted afterwards. ### Heat-pump readiness If a heat pump is on your 5-year plan, we oversize emitters now, use larger pipework and pick a cylinder with a heat-pump-ready coil, so the future swap is straightforward. ### Residential vs. commercial / new build For developers and commercial jobs we work from architect drawings, size to Part L, and coordinate with electricians and floor screeders on programme. See our New Build page. FAQs ## Straight answers. ### How much does a heating system upgrade cost? Highly variable, a radiator + valve swap-round starts a few hundred pounds; a full-house system upgrade with new boiler, cylinder, controls and UFH runs into five figures. Every quote is fixed price after a proper survey. ### Does my system need cleaning? Not always. If your system is under 10 years old and has a filter, a standard chemical clean is often enough. Heavily sludged older systems need a deeper clean, we'll tell you honestly which applies. ### Can I add underfloor heating to an existing home? Yes, low-profile retrofit UFH systems fit on top of suspended floors with minimal build-up. For extensions, wet UFH in screed is usually the right answer. ### Will underfloor heating work with my boiler? Yes, with a manifold, blending valve and correct controls to drop the flow temperature. We size it as part of the design. ### How long does a system upgrade take? A rad-and-valve rebalance is a day. A full-system + boiler upgrade is typically 3–5 days. UFH installs depend on floor area and construction; we programme it honestly. ### Do you handle listed / stone properties? Yes. We route pipework to preserve elevations, use compatible finishes, and can work with heritage consultants on listed jobs. ### Will this work with a future heat pump? If you tell us that's the plan, we'll design the system for it: oversized emitters, adequate pipework, heat-pump-ready cylinder. That saves the whole cost of a rip-out later. ### Do you offer finance? Yes, Klarna is available for larger heating projects. We'll walk you through options when we quote. ## Related services All services Boiler Installation New A-rated boilers installed by Vaillant and Worcester Bosch approved engineers. Learn more Heat Pumps Air source heat pumps designed and installed by an experienced heat pump team, using Vaillant, Mitsubishi and Samsung equipment we are approved to install. Learn more Radiators & Valves Radiator swap-outs, upgrades to larger emitters, designer verticals, TRV installations, lockshield balancing and cold-radiator diagnostics, done properly so the whole system works better, not just the new rad. Learn more Ready when you are ## Get a fixed-price quote for central heating in Witney, Oxford. Free, no-obligation quote in writing. Gas Safe registered, fully insured to £5m. Local team, real engineers, no call centres. Get a Free QuoteCall 01865 306381 Gas Safe RegisteredManufacturer Approved£5m Public Liability Gas Safe registered plumbing & heating engineers serving Oxfordshire and the Cotswolds since 2020. - ### Services General Plumbing Repairs - Emergency Plumber - Boiler Installation - Boiler Servicing - Boiler Repairs - Central Heating - Bathroom Renovations - Air Source Heat Pumps ### Areas - Plumber in Witney - Plumber in Carterton - Plumber in Oxford - Plumber in Oxfordshire - Plumber in Abingdon - Plumber in Bicester - Plumber in Cotswolds - Plumber in Woodstock - Plumber in Moreton-in-Marsh ### Contact - 01865 306381 - admin@pinnacle-plumbing.co.uk - Carterton, OxfordshireMonday – Friday8:30 AM – 5:00 PM Saturday & SundayEmergency call-outs only © 2026 Pinnacle Plumbing & Heating Direct Ltd. All rights reserved. Privacy policyTerms & conditionsGas Safe · £5m PL Call NowFree Quote