--- title: "Boiler Servicing in Corby & Northants | Gas Safe | Reactive" description: "Annual boiler service in Corby, Kettering & Northants — fixed-price. Keeps your warranty valid, cuts gas bills, landlord CP12 certificates issued same day." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How often should I service my boiler?", "acceptedAnswer": { "@type": "Answer", "text": "Annually, without exception. Manufacturer warranties almost universally require it; Gas Safe and OFTEC both recommend it; landlord regulations mandate it on rental properties. Skip a year and you're rolling the dice on warranty and safety." } }, { "@type": "Question", "name": "How long does a service take?", "acceptedAnswer": { "@type": "Answer", "text": "Standard combi service: 45–60 minutes. System or regular boiler with cylinder: 60–90 minutes. Landlord CP12 with multiple appliances: usually within an hour." } }, { "@type": "Question", "name": "Do you do landlord CP12 certificates?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — same day, digital + paper copy provided. We work directly with several letting agents in Corby and Kettering. Multiple property portfolios discounted." } }, { "@type": "Question", "name": "Is a service the same as a safety check?", "acceptedAnswer": { "@type": "Answer", "text": "Related but not identical. A safety check is a subset (gas tightness, flue, combustion). A full service includes the safety check plus internal cleaning, condensate trap, expansion vessel, controls test and written record. Always book the full service for warranty validity." } }, { "@type": "Question", "name": "Will you service a boiler you didn't install?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — most of the boilers we service were installed by someone else. Worcester, Vaillant, Ideal, Baxi, Glow-worm, Vokera, Potterton — all welcome." } }, { "@type": "Question", "name": "Do you do oil boiler servicing?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — Our engineers are OFTEC registered for oil. Process is different from gas (nozzle change, electrode reset, smoke test) but priced similarly." } }, { "@type": "Question", "name": "Will you remind me when next service is due?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — automatic reminder sent 4 weeks before your annual due date. You can also book directly online or by phone whenever suits." } }, { "@type": "Question", "name": "What if you find a fault during the service?", "acceptedAnswer": { "@type": "Answer", "text": "We'll point it out, give you a written quote for repair, and let you decide. We never proceed with extra work without your sign-off, and we never inflate a service into 'urgent repairs' to win extra invoice." } } ] }, { "@context": "https://schema.org", "@type": "Service", "@id": "https://reactiveplumbing.co.uk/boiler-servicing#service", "name": "Boiler Servicing in Corby & Northants", "serviceType": "Boiler Servicing in Corby & Northants", "description": "Annual boiler service in Corby, Kettering & Northants — fixed-price. Keeps your warranty valid, cuts gas bills, landlord CP12 certificates issued same day.", "url": "https://reactiveplumbing.co.uk/boiler-servicing", "provider": { "@id": "https://reactiveplumbing.co.uk/#localbusiness" }, "areaServed": [ { "@type": "City", "name": "Corby" }, { "@type": "City", "name": "Kettering" }, { "@type": "City", "name": "Desborough" }, { "@type": "City", "name": "Rothwell" }, { "@type": "City", "name": "Oundle" }, { "@type": "City", "name": "Market Harborough" }, { "@type": "City", "name": "Wellingborough" }, { "@type": "City", "name": "Oakham" }, { "@type": "City", "name": "Stamford" }, { "@type": "City", "name": "Peterborough" } ], "offers": [ { "@type": "Offer", "name": "Standard combi service", "priceCurrency": "GBP", "priceSpecification": { "@type": "PriceSpecification", "price": "Fixed price", "priceCurrency": "GBP" }, "description": "Full Gas Safe service, flue gas analysis, written record, sticker, digital copy emailed." }, { "@type": "Offer", "name": "System or regular boiler service", "priceCurrency": "GBP", "priceSpecification": { "@type": "PriceSpecification", "price": "Fixed price", "priceCurrency": "GBP" }, "description": "All of the above plus expansion vessel, PRV and unvented cylinder G3 check where applicable." }, { "@type": "Offer", "name": "Landlord CP12 + service", "priceCurrency": "GBP", "priceSpecification": { "@type": "PriceSpecification", "price": "Fixed price", "priceCurrency": "GBP" }, "description": "Full service plus same-day issue of Landlord Gas Safety Record (CP12). Multiple appliances priced on request." } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://reactiveplumbing.co.uk" }, { "@type": "ListItem", "position": 2, "name": "Heating & Gas Services", "item": "https://reactiveplumbing.co.uk/heating-gas-services" }, { "@type": "ListItem", "position": 3, "name": "Boiler Servicing in Corby & Northants", "item": "https://reactiveplumbing.co.uk/boiler-servicing" } ] }, { "@context": "https://schema.org", "@type": "Person", "name": "Carl Eddershaw", "jobTitle": "Director & Lead Engineer", "worksFor": { "@id": "https://reactiveplumbing.co.uk/#localbusiness" }, "knowsAbout": [ "Gas Safe Registered", "Worcester Accredited Servicer", "Vaillant Service approved", "OFTEC for oil boilers", "Unvented Cylinder G3 Certified" ] } ] --- Gas Safe Registered · OFTEC Registered · Checkatrade Verified 9 Rutherford Court, Corby NN17 4SJ [info@reactiveph.co.uk](mailto:info@reactiveph.co.uk) [![Reactive Gas Heating & Plumbing logo](/__l5e/assets-v1/51d713a4-18a4-4b5f-96fb-2fcce169e56c/reactive-logo.png)](/) ServicesAreasGuides[About](/about)[Our Work](/our-work)[Plans](/maintenance-plans)[Reviews](/reviews)[Contact](/contact) [24/7 Call 07915 906262 ](tel:+447915906262)[Fixed Boiler Quote](/boiler-quote) 1. [Home](/) 2. [Heating & Gas Services](/heating-gas-services) 3. Annual Boiler Servicing Heating & Gas Services # Annual Boiler Servicing in Corbyfixed-price — keeps your warranty valid landlord CP12 certificates included An annual service is the cheapest insurance you'll ever buy for your heating system. Keeps your manufacturer warranty valid, reduces gas consumption, catches small problems before they become winter breakdowns. Booked at a time that suits you. [Enquire Now](/contact) [Call 07915 906262](tel:+447915906262) - Fixed-price service - Gas Safe registered - Landlord CP12 same day - Worcester Accredited Servicer Fixed Standard combi service price 10+ Manufacturer checks performed Same day CP12 issued 100% Gas Safe registered Boiler servicing — combi, system, regular, LPG & oil ## What an annual service actually does — and why your warranty depends on it An annual boiler service is a 45–60 minute thorough inspection: visual check of casing and combustion chamber, flue gas analysis to confirm clean combustion, gas pressure check at the inlet and burner, condensate trap clean, system pressure check, expansion vessel check, electrical safety check, controls test, and a written service record. Almost every domestic boiler manufacturer requires annual servicing as a condition of the warranty — Worcester, Vaillant, Ideal, Baxi, Glow-worm, Viessmann all specify it. Skip a year, and the warranty can be voided. Service annually with a Gas Safe engineer, and you keep the warranty live for its full 5–12 year term. On top of warranty validity, a service genuinely reduces gas consumption. A boiler running with a partially-blocked flue, dirty heat exchanger or out-of-spec gas pressure burns more fuel for the same heat output. Annual service typically cuts gas use by 5–10% versus an unmaintained boiler. What happens if you wait ## Skipped services kill warranties — and find faults the hard way We've seen 4-year-old boilers with rejected warranty claims because the owner couldn't produce annual service records. The boiler was fine; the paperwork wasn't — and a repair that should have been free under warranty became a chargeable bill. Carbon monoxide is the other reason to service. A blocked flue or cracked heat exchanger can leak CO into the home — colourless, odourless, and lethal at the right concentration. Annual flue gas analysis catches it. - Manufacturer warranty void after a missed service — repair bills back on you - Gas Safe certification gap for landlords — fines and prosecution risk - CO leak from blocked flue or cracked heat exchanger — silent risk - Inefficient combustion = 5–10% higher gas bills - Small faults (worn condensate trap, dirty filter) compounding into failures - Insurance refusal on heating-related water damage with no service history Our process ## From first call to job done — exactly what to expect 1. 01 ### Visual inspection Casing, flue terminal, condensate, gas connections, electrical isolation, pipework, controls all visually checked. 2. 02 ### Combustion test Flue gas analyser used at the flue. CO, CO2 and ratio recorded against manufacturer spec. 3. 03 ### Internal checks Casing removed, burner condition checked, heat exchanger inspected, condensate trap cleaned, electrical safety tested. 4. 04 ### System checks System pressure, expansion vessel charge, inhibitor test, magnetic filter clean if fitted, controls tested. 5. 05 ### Documentation Written service record, sticker on boiler, digital copy emailed. CP12 issued same day for landlords. Why customers choose Reactive ## No guesswork. No upsell. Just the work, done right. - ### Keeps warranty valid Manufacturer service requirements met to the letter. Documentation accepted by Worcester, Vaillant, Ideal, Baxi. - ### Cuts gas bills 5–10% gas reduction typical on a serviced vs unserviced boiler over a heating season. - ### Catches small problems early Worn condensate trap, weak ignition, low expansion charge — fixed before they cause winter breakdowns. - ### Booked at your convenience Evening and Saturday slots available. Annual reminder sent so you never miss. - ### Landlord CP12 included Same-day Landlord Gas Safety Record (CP12) issued where applicable. Digital copy emailed. - ### Carbon monoxide check Flue gas analysis catches CO leaks early. Genuine safety value, not a sales pitch. ![Open boiler combustion chamber and burner during annual service inspection by Gas Safe engineer](/__l5e/assets-v1/20bb6542-a0f0-4f48-8177-13f7835b3333/img-006.jpeg) In detail ## What's actually in a Gas Safe boiler service — checklist by checklist A proper service is not 'a quick look'. It's a defined sequence of checks against the manufacturer's specification for that exact boiler model. Worcester, Vaillant and Ideal each publish their own service schedules; we follow them to the letter and document each step. The headline check is the flue gas analysis. A calibrated analyser samples the flue gas and reports oxygen, carbon monoxide, carbon dioxide and the ratio of CO to CO2 — known as the lambda or excess air figure. Each manufacturer specifies a target range for these values. Outside the range means dirty combustion, partial blockage, or burner wear. Beyond combustion, we check: gas inlet pressure, working pressure at the burner, expansion vessel pre-charge (a flat vessel is the #1 cause of mystery pressure loss), system inhibitor concentration, electrical safety (Class 1 earth continuity), condensate trap cleanliness, controls function (call-for-heat, hot water priority, frost protection), and the condition of all visible pipework and fittings. - ### Combi boiler service Standard 45–60 min. Plus DHW priority, plate heat exchanger flow rate, diverter check. - ### System boiler service Plus unvented cylinder G3 check (where Reactive installed it), expansion vessel + PRV. - ### Regular (heat-only) Plus open-vent / F&E tank check, pump performance test. - ### LPG service Same as gas plus tank-to-property pipework check, regulator and changeover. - ### Oil boiler (OFTEC) Different process — burner strip-down, nozzle replacement, electrode reset, smoke and combustion. - ### Landlord CP12 Statutory check for rented properties. Issued same day, digital + paper copy provided. Honest pricing ## How much does a boiler service cost in Corby & Northants? Pricing depends on boiler type and whether a CP12 landlord certificate is required. Annual servicing plans cut the per-year cost. Standard combi service Fixed price Full Gas Safe service, flue gas analysis, written record, sticker, digital copy emailed. System or regular boiler service Fixed price All of the above plus expansion vessel, PRV and unvented cylinder G3 check where applicable. Landlord CP12 + service Fixed price Full service plus same-day issue of Landlord Gas Safety Record (CP12). Multiple appliances priced on request. ### What changes the price - Boiler type (combi, system, regular, LPG, oil) - Single or multiple gas appliances - Whether CP12 landlord certificate required - Distance from Corby (Ring 1 — no travel charge) - Annual plan vs. one-off service - Magnetic filter clean if fitted (included free) Free, fixed-price quote — no obligation, no callout fee. [Get my fixed price](/contact) Areas covered ## Local cover across Northants & Rutland Servicing covers everywhere we install — Corby, Kettering, Wellingborough, Desborough, Rothwell, Oundle, Oakham, Market Harborough and the surrounding villages. Annual reminder sent automatically once you're on our service list. - [Boiler service in Corby ](/areas/corby) - [Annual boiler service Kettering ](/areas/kettering) - [Boiler servicing Oundle ](/areas/oundle) - [Landlord CP12 Market Harborough ](/areas/market-harborough) Who'll be doing the work ## The Reactive engineering team We personally service every boiler we install — annual service plus 12-year warranty registration on Worcester, 10-year on Vaillant. The boilers we install we still know intimately when we come back to service them. - Gas Safe Registered - Worcester Accredited Servicer - Vaillant Service approved - OFTEC for oil boilers - Unvented Cylinder G3 Certified FAQs ## Questions we actually get asked Anything not covered here? Pick up the phone — straight talk, no salesperson in the middle. [Call 07915 906262](tel:+447915906262) ### ### How often should I service my boiler? ### ### How long does a service take? ### ### Do you do landlord CP12 certificates? ### ### Is a service the same as a safety check? ### ### Will you service a boiler you didn't install? ### ### Do you do oil boiler servicing? ### ### Will you remind me when next service is due? ### ### What if you find a fault during the service? Related services [ In this category Fixed-price boiler installation ](/boiler-installation)[ In this category Same-day boiler repair ](/boiler-repair)[ In this category LPG boiler & pipework ](/lpg-engineer)[ You may also need Pre-service system flush if needed ](/power-flushing)[ Back to hub All Heating & Gas Services ](/heating-gas-services) Ready when you are ## Keep the warranty live. Book your service. Fixed-price annual service, Gas Safe certified, manufacturer warranty maintained, landlord CP12 same day. [Enquire Now](/contact) [07915 906262](tel:+447915906262) Last updated May 2026 · Reactive Gas Heating and Plumbing Services Limited · 9 Rutherford Court, Corby NN17 4SJ · Gas Safe Registered · OFTEC Registered · Checkatrade Verified [![Reactive Gas Heating & Plumbing logo](/__l5e/assets-v1/51d713a4-18a4-4b5f-96fb-2fcce169e56c/reactive-logo.png)](/) Reactive Gas Heating and Plumbing Services Limited. Plumbing, heating and gas engineers based in Corby — covering Northamptonshire, Rutland, Leicestershire and the East Midlands. [07915 906262 ](tel:+447915906262) [0800 861 1593 (freephone)](tel:+448008611593) [07488 883576](tel:+447488883576) [07342 043953](tel:+447342043953) [info@reactiveph.co.uk](mailto:info@reactiveph.co.uk) 9 Rutherford Court Corby, Northamptonshire NN17 4SJ [](https://www.facebook.com/Reactiveservices/)[](https://www.instagram.com/reactivegasheatingplumbing/) ### [Plumbing](/plumbing-services) - [Emergency Plumbing](/emergency-plumbing) - [Drain Unblocking & Drainage](/drain-unblocking) - [Leak Detection & Repair](/leak-detection-repair) - [Power Flushing](/power-flushing) ### [Heating & Gas](/heating-gas-services) - [Boiler Installation](/boiler-installation) - [Boiler Repair & Breakdown](/boiler-repair) - [Boiler Servicing](/boiler-servicing) - [LPG Installation & Servicing](/lpg-engineer) - [Oil Boiler Installation & Servicing](/oil-boiler-engineer) ### [Areas Covered](/areas) - [Corby](/areas/corby) - [Kettering](/areas/kettering) - [Desborough](/areas/desborough) - [Rothwell](/areas/rothwell) - [Oundle](/areas/oundle) - [Market Harborough](/areas/market-harborough) - [Wellingborough](/areas/wellingborough) - [Oakham](/areas/oakham) - [Stamford](/areas/stamford) - [Peterborough](/areas/peterborough) ### Company - [About our team](/about) - [Customer Reviews](/reviews) - [Recent Work](/our-work) - [Maintenance Plans](/maintenance-plans) - [Current Offers](/specials) - [Contact](/contact) - [Privacy Policy](/privacy-policy) - [Terms & Conditions](/terms-conditions) ### Opening Hours - Monday: 08:00–18:00 - Tuesday: 08:00–18:00 - Wednesday: 08:00–18:00 - Thursday: 08:00–18:00 - Friday: 08:00–18:00 - Saturday: 08:00–13:00 - Sunday: Closed - 24/7 emergency cover — call any time outside working hours ### Guides & Blog - [Combi vs System vs Regular Boilers: Which Is Right for You?](/guides/combi-vs-system-vs-regular-boilers) - [How Much Does a New Boiler Cost in 2026?](/guides/how-much-does-a-new-boiler-cost) - [8 Signs You Need a New Boiler (Not Just a Repair)](/guides/signs-you-need-a-new-boiler) - [Common Boiler Fault Codes Explained](/guides/common-boiler-fault-codes-explained) - [What to Do in a Plumbing Emergency](/guides/what-to-do-in-a-plumbing-emergency) - [How to Turn Off Your Water at the Mains](/guides/how-to-turn-off-water-at-the-mains) © 2026 Reactive Gas Heating and Plumbing Services Limited. Registered in England & Wales, company no. 13663757. Gas Safe Registered · OFTEC Registered · Checkatrade Verified [Call Now](tel:+447915906262)[Fixed Boiler Quote](/boiler-quote)