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/Efficiency Checks Efficiency Checks # Boiler & HeatingEfficiency Checksin Watford A straight, independent report on how well your boiler and heating system are actually running — with practical, prioritised recommendations for lowering bills without wasting money on the wrong upgrades. 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 Diagnostic experience £0 Call-out fee £5m Public liability 12 mo Workmanship guarantee 4.9★ 156 Google reviews ## What efficiency checks actually covers ### What it is A whole-system efficiency assessment: combustion analysis, gas rate check, system water quality reading, radiator balance survey, controls audit and expansion vessel check. You get a written report and prioritised recommendations. ### Who it's for Homeowners with rising gas bills, anyone thinking about a new boiler who wants an honest 'do I actually need one?' second opinion, and buyers wanting an independent view of a heating system pre-purchase. ### When you need it Whenever gas bills feel wrong for the size of the home, before committing to a new boiler quote, at the start of a house purchase, or as part of preparing to install smart controls or a heat pump in future. ### Why professional help matters Most 'upgrade' quotes assume you need the most expensive option. A proper efficiency check tells you what would actually move the needle — sometimes a service and a rebalance, sometimes a new boiler, occasionally nothing at all. ## The cost of leaving it Guessing at heating efficiency is expensive both ways: either you overspend on kit you didn't need, or you underspend and keep burning gas you didn't have to. ### What can go wrong - An incorrectly set gas rate can waste 5–15% of gas or produce dangerous combustion — invisibly, until it's measured. - Systems full of magnetite can knock 20% off effective heat output while the boiler works harder to compensate. - A tired pump or failing motorised valve can cost more in gas over a winter than replacing it would. - Fitting smart controls to a badly balanced system reduces the savings you should see from them. ### Common mistakes we see - Believing every 'your boiler is beyond repair' verdict without a second opinion. - Assuming smart controls alone will fix a system that's badly balanced or full of sludge. - Not measuring before and after when spending money on efficiency work. - Judging efficiency by the age of the boiler alone — a well-maintained 10-year-old boiler can outperform a poorly commissioned new one. ## Our process A clear, repeatable system — the same on every job, whether you're a homeowner or a landlord with a portfolio. - 01 ### Baseline readings Combustion analysis, gas rate, system pressure and temperatures documented as they currently are. - 02 ### Water quality test System water sampled — inhibitor level, magnetite content, pH. - 03 ### System survey Every radiator temperature-tested, controls and TRVs checked, pump and valves inspected. - 04 ### Findings & recommendations Written report with prioritised actions ranked by likely payback. - 05 ### Quote (only if needed) You are under no obligation. If you'd like us to carry out any recommended work it's quoted separately, in writing. ## What you get ### Independent, honest report You'll be told what actually needs doing — including 'nothing' where that's the answer. ### Prioritised recommendations Actions ranked by likely payback so you know where to spend first. ### Real measurements Combustion analyser and water quality readings — not opinions. ### Second-opinion peace of mind Useful before agreeing to a big-ticket 'you need a new boiler' quote from elsewhere. ### House-purchase confidence Independent view of a heating system before you commit to buying a property. ### No pressure to buy work The report stands on its own. You decide what happens next. ## Recent efficiency checks work Photos from real jobs completed by Matt and the Premier Heating team. ## In detail An efficiency check is a diagnostic exercise, not a sales pitch. Here's what a proper one measures. ### Combustion and gas rate The single biggest efficiency variable most homes never check. A boiler running rich or lean, or firing at the wrong gas rate, can easily waste 5–15% of the gas going in. Fixing it usually takes an adjustment, not a new boiler. ### System water quality Magnetite (black iron oxide) in the system water reduces heat transfer, blocks radiators unevenly and knocks pump life down. A sample gives us a clear before-and-after picture and tells us whether a flush is genuinely needed or not. ### Radiator balance and heat output We temperature-test every radiator (flow vs return). Rooms that never reach temperature are almost always a balancing issue, not a boiler issue. Rebalancing is often the highest-payback fix in the whole report. ### Controls audit Old programmers and mechanical thermostats drift out of accuracy. Smart controls (Tado, Hive, Nest, Vaillant vSMART) with weather compensation and load compensation can genuinely reduce gas usage — but only worth fitting if the underlying system is healthy. ### Payback ranking Every recommendation in the report is ranked by likely payback: quick wins (rebalance, correct gas rate, replace failing TRVs), medium (flush + inhibitor, controls upgrade), and larger (new boiler, system upgrade). You always know where to spend first. ## Frequently asked questions How much does an efficiency check cost?Priced individually depending on system size and access. Every quote is written and free. There is no call-out fee. Do I have to book any work you recommend?No — you are under no obligation. The report stands on its own. Will you tell me if I don't need a new boiler?Yes, honestly. If a service, a rebalance and a filter would do the same job for a fraction of the cost, we'll say so. How long does an efficiency assessment take?Typically 1.5–2 hours on-site. The written report follows within 24 hours. Is this the same as an EPC?No — an EPC is a whole-house energy assessment done by a domestic energy assessor. This is a system-level heating efficiency assessment done by a Gas Safe engineer. Can you do this before I buy a house?Yes — pre-purchase heating assessments are one of the most useful ones we do. You'll know exactly what you're buying. Are you Gas Safe registered?Yes — Gas Safe Registration Number 212325. Matt Winn is ex-British Gas trained with 38+ years in the gas industry. 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. ## Related services - Boiler Servicing - Heating Maintenance - 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. ## Get an honest read on your heating system. Independent efficiency assessment, written report, no obligation to book any work. 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