Gas Safe Registered 212325Mon–Fri 8am–8pm · Sat 8am–1pm contact@premier-heating.com07870 210610 HomeAboutServicesBoilers - Boiler Replacement - Boiler Repair & Breakdowns - Boiler Servicing - Emergency Call-Outs Heating Systems - Heating Maintenance - Radiator Installation - Underfloor Heating - Smart Controls Water & Bathrooms - Unvented Cylinders - Bathroom Installations - Plumbing - Powerflushing - Efficiency Checks View all services Current offerNew Boiler + Flue + Filter from £1,975 Vaillant Accredited. Up to 10-year manufacturer warranty. Free fixed-price quote, no call-out fee. Get a Free Quote Boiler QuoteAreasAll Areas - Watford - Northwood - Rickmansworth - Pinner - Bushey - Hatch End - Stanmore - Middlesex - Greater London - Radlett Our WorkReviewsContact07870 210610Request a Quote Home/Services/Boiler Replacement Boiler Replacement # Boiler Replacementin Watford &Hertfordshire A new A-rated boiler fitted properly, at a fixed price, by the same engineer who quoted you — with up to a 10-year manufacturer warranty and a written 12-month workmanship guarantee. Request a Free Quote 07870 210610 Gas Safe 212325 4.9★ · 156 Google reviews No call-out fee ### Request a Free Quote No call-out fee. Fixed prices where possible. Reply within the hour. 38+ yrs Gas experience 10 yr Vaillant warranty £1,975 From, fitted £5m Public liability 4.9★ 156 Google reviews ## What boiler replacement actually covers ### What it is A full boiler replacement covers the boiler, a new flue, a system filter, isolation valves, condensate route and all electrical connections — commissioned to manufacturer specification and notified to Building Control under our Gas Safe registration (No. 212325). ### Who it's for Homeowners with a boiler over 10 years old, anyone with rising gas bills, landlords upgrading rental properties, or households whose boiler is beyond economic repair. If a fault costs more than a third of a replacement, you're usually better off changing it. ### When you need it Ideally before winter, before you're forced into an emergency swap at short notice. Signs it's time: repeated breakdowns, low pressure that keeps returning, banging or kettling, cold radiators at the top of the house, or an F-code that keeps coming back. ### Why professional help matters Boiler swaps look simple until they aren't. A new boiler installed onto a dirty, unbalanced system will fail early and void the warranty. Every install we do includes a system flush, filter, correct gas rate, tightness test and full commissioning paperwork — not just a like-for-like swap. ## The cost of leaving it Putting off a replacement is expensive. An inefficient boiler quietly burns money every month, and a boiler on borrowed time almost always fails on the coldest weekend of the year. ### What can go wrong - An old non-condensing boiler can be 20–30% less efficient than a modern A-rated unit — that's real money on every gas bill. - A failed heat exchanger or gas valve on an older boiler is often uneconomic to repair and can leave you without heat or hot water for days waiting on parts. - Emergency replacements cost more, restrict brand choice, and rarely allow time to size the boiler properly for your home. - A boiler that hasn't been notified to Gas Safe / Building Control can jeopardise a house sale and your building insurance. ### Common mistakes we see - Choosing the cheapest quote without checking the installer is Gas Safe registered and manufacturer-accredited. - Accepting a like-for-like swap without a system flush — this alone can void a 10-year warranty. - Oversizing 'to be safe' — an oversized combi short-cycles, wastes gas and wears out faster. - Skipping a system filter and inhibitor to shave £100 off the quote, then paying for a powerflush 18 months later. ## Our process A clear, repeatable system — the same on every job, whether you're a homeowner or a landlord with a portfolio. - 01 ### Free on-site survey Matt visits, measures gas rate, checks the flue route, hot water demand and existing pipework. - 02 ### Fixed written quote Emailed the same day (or within 24 hours). Boiler brand and model, warranty length and all inclusions listed line by line. - 03 ### Install day Usually 1 day for a straight swap, 2 days for a system change. Dust sheets down, floors protected, area left cleaner than we found it. - 04 ### Commissioning & testing Gas tightness test, correct gas rate to manufacturer spec, full flue gas analysis, controls set up and every radiator balanced. - 05 ### Registration & guarantee Notified to Gas Safe and Building Control, manufacturer warranty registered in your name, Benchmark logbook completed and handed over. ## What you get ### Fixed price, no surprises The price you're quoted is the price you pay. If we hit something unexpected, we call before spending your money. ### Up to 10-year warranty Full 10 years on Vaillant as an Accredited Installer. Up to 10 years on other major brands. ### Lower bills from day one Correctly sized, correctly commissioned. Most customers see a meaningful drop in gas usage in the first billing cycle. ### Cleaner, quieter home New system filter, magnetite removed, radiators balanced — no more cold spots or kettling. ### Safe & compliant Notified under our Gas Safe registration. Building Control certificate provided. £5m public liability cover. ### One engineer, start to finish Matt (or Matt and his son) quotes, installs and commissions. No subcontractors, no handovers. ## Recent boiler replacement work Photos from real jobs completed by Matt and the Premier Heating team. ## In detail We fit all major boiler brands — combi, system and regular (heat-only). As an Accredited Vaillant installer we can register the full manufacturer 10-year warranty in your name. ### Combi vs system vs regular A combi suits most 1–3 bathroom homes with a single shower running at a time and no need for a cylinder. A system boiler with an unvented cylinder is the right call for larger homes, multiple bathrooms or households that want strong flow at two showers at once. Regular (heat-only) boilers make sense where you're keeping a cold-water tank and cylinder for a specific reason. We size on hot water demand and radiator heat loss — not on the sticker of the old boiler. ### Vaillant Accredited installation Vaillant only allows their Accredited Installers to register the full 10-year manufacturer warranty. That covers parts and labour on the boiler for a decade, provided it's serviced annually. It's a genuinely different product from the shorter warranties available through non-accredited fitters. ### System flush and filter as standard Every replacement includes a hot chemical flush (or a full powerflush where the system needs it), a magnetic system filter (usually Adey or Fernox) and a fresh dose of inhibitor. This protects the new heat exchanger, keeps efficiency high and is a manufacturer requirement for the long warranties. ### Flue routing and controls We cover horizontal, vertical and plume-management flue kits, and can move the boiler location where the current position causes noise, plume or access issues. Smart controls (Tado, Hive, Nest, Vaillant vSMART) can be added at install for weather compensation and load compensation, which further cuts gas usage. ### Landlords and portfolios For landlords we can bundle the replacement with a CP12 landlord safety certificate and set up an annual service schedule. We're used to working around tenants and can coordinate access directly. ## Frequently asked questions How much does a new boiler cost, fitted?Our new boiler + flue + system filter installations start from £1,975 fitted. The exact price depends on the boiler brand and model, whether you're changing type (e.g. system-to-combi) and the flue route. Every quote is fixed, written and free. How long does a boiler replacement take?A straight combi-for-combi swap in the same location is usually done in a day. Converting from a system boiler to a combi, or relocating the boiler, is typically 1.5–2 days. We'll tell you which on the survey. What warranty do I get?Up to 10 years' manufacturer warranty on all major brands, and the full 10-year Vaillant warranty as an Accredited Installer. On top of that, all of our workmanship is guaranteed for 12 months. Do I need a powerflush before a new boiler?Not always. Every install includes at minimum a hot chemical flush and a new magnetic filter. If the system water is heavily contaminated we'll recommend a full powerflush — priced separately — to protect your new warranty. Do you take a deposit?No deposit is required on most installs. Payment can be by card, cash or bank transfer on completion. 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. Will you register the boiler and notify Building Control?Yes. Every install is notified under our Gas Safe registration (No. 212325) and the manufacturer warranty is registered in your name. You'll receive a Benchmark logbook and Building Control certificate. Can I keep my old thermostat or should I upgrade?You can keep a working thermostat, but modern smart controls (Tado, Hive, Nest, Vaillant vSMART) with weather/load compensation can noticeably reduce gas usage. We'll price both options on the quote. ## Related services - Boiler Servicing - Powerflushing - Smart Controls ## Areas we cover Based in Watford, serving Hertfordshire and Greater London. Watford Northwood Rickmansworth Pinner Bushey Hatch End Stanmore Middlesex Greater London Need something not listed? Get in touch. ## Ready for a warmer home and lower bills? Free on-site quote, fixed price, no call-out fee. Matt personally answers every enquiry. Request a Free Quote 07870 210610 Gas Safe 212325 4.9★ · 156 Google reviews 12-month workmanship guarantee 07870 210610Free Quote Family-run boiler and heating specialists serving Watford and Hertfordshire for over 38 years. Ex-British Gas trained. Gas Safe Registered. Vaillant Accredited. Gas Safe 212325 - ServicesBoiler Replacement - Boiler Breakdowns - Boiler Servicing - Heating Maintenance - Radiator Installation - Emergency Call Outs - Efficiency Checks - Smart Controls - Powerflushing - Unvented Cylinders - Bathroom Installations - Underfloor Heating - Plumbing Areas - Watford - Northwood - Rickmansworth - Pinner - Middlesex - Bushey - Hatch End - Stanmore - London Contact - 205 Prestwick Rd,Watford WD19 6EJ - 07870 210610 - contact@premier-heating.comOpening Hours Mon–Fri · 8am–8pm Saturday · 8am–1pm Sunday · Closed © 2026 Premier Heating. All rights reserved. AboutOur WorkReviewsContactPrivacyTermsCookies Family-run · Ex-British Gas trained · £5m PL Call NowGet a Quote We use essential cookies to run this site, plus optional ones to measure traffic. Cookie policy AcceptReject