--- title: "Combi Boiler Servicing in Stockport & Greater Manchester | Swainson Gas" description: "Specialist combi boiler servicing across Stockport. Full strip-down, combustion analysis and written report. Gas Safe #9663, from £98 inc. 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Full strip-down, combustion analysis and written report. Gas Safe #9663, from £98 inc. VAT.", "provider": { "@type": "LocalBusiness", "name": "Swainson Gas Services Ltd", "telephone": "07442 536165", "address": { "@type": "PostalAddress", "addressLocality": "Stockport", "addressCountry": "GB" } }, "areaServed": [ "Hazel Grove", "Stockport", "Bramhall", "Cheadle Hulme", "Poynton", "Marple", "High Lane" ], "url": "/services/combi-boiler-servicing" }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much is a combi boiler service?", "acceptedAnswer": { "@type": "Answer", "text": "Basic combi service from £98 inc. VAT; full strip-down service £155 + parts inc. VAT. The full service is recommended for combis over five years old." } }, { "@type": "Question", "name": "How long does a combi service take?", "acceptedAnswer": { "@type": "Answer", "text": "Usually 60–90 minutes. Older combis, or ones that haven't been serviced for a couple of years, take longer because more cleaning is involved." } }, { "@type": "Question", "name": "My combi loses pressure, can you fix that at service?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Falling pressure is usually one of three things: an expansion vessel that's lost pre-charge, an auto air vent leaking, or a small system leak. We'll identify which at the service." } }, { "@type": "Question", "name": "Do you service my brand of combi?", "acceptedAnswer": { "@type": "Answer", "text": "Worcester Bosch, Vaillant, Ideal, Baxi, Main, Potterton and Glow-worm all covered. Ring and ask about anything else, most are supported." } }, { "@type": "Question", "name": "Will servicing keep my warranty valid?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, a Gas Safe registered service logged annually is what nearly every manufacturer requires. You'll receive a written record for your warranty file." } }, { "@type": "Question", "name": "Can I book a combi service and a landlord CP12 together?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, and it's the most cost-effective way to do both. Booked on the same visit." } }, { "@type": "Question", "name": "What if you find a fault during the service?", "acceptedAnswer": { "@type": "Answer", "text": "We stop, explain, quote, and only proceed with your approval. Diagnostics are included in the service fee; parts and repair labour are quoted separately." } }, { "@type": "Question", "name": "How do I book?", "acceptedAnswer": { "@type": "Answer", "text": "Call the mobile on 07442 536165, or use the callback form on the contact page." } } ] } ] --- Based in Stockport [info@swainsongas.co.uk](mailto:info@swainsongas.co.uk)Gas Safe registered #9663 Open 7am – 6pm, 7 days [](https://www.facebook.com/people/Swainson-Gas-Services/61563360904402/)[](https://www.instagram.com/swainsongas/)[](https://x.com/swainsongas) [![Swainson Gas Services](/__l5e/assets-v1/2f3afd23-ed83-4d5d-a90b-6d75c9544dc3/swainson-logo.png)](/) [Home](/) [About](/about) [Services](/services) Our services - [Boiler Servicing & Maintenance](/services/boiler-servicing) - [Boiler Repairs & Breakdowns](/services/boiler-repairs) - [Gas Safety Checks](/services/landlord-gas-safety-check) - [Heating Controls & Radiators](/services/thermostat-heating-controls) - [Other Gas Services](/services/gas-fire-servicing) [Areas](/areas) Areas we cover [Hazel Grove](/areas/hazel-grove)[Stockport](/areas/stockport)[Poynton](/areas/poynton)[Bramhall](/areas/bramhall)[Cheadle Hulme](/areas/cheadle-hulme)[Marple](/areas/marple)[High Lane](/areas/high-lane)[Sale](/areas/sale)[Didsbury](/areas/didsbury)[Offerton](/areas/offerton)[Woodley](/areas/woodley)[Bredbury](/areas/bredbury)[Romiley](/areas/romiley)[Davenport](/areas/davenport)[Heaviley](/areas/heaviley)[Gatley](/areas/gatley)[Cheadle](/areas/cheadle)[Disley](/areas/disley)[Handforth](/areas/handforth)[The Heatons](/areas/the-heatons) [Reviews](/reviews) [Contact](/contact) [Call the engineer 07442 536165 ](tel:+447442536165)[Book in now](/contact) ![Combi boiler heat exchanger internals cleaned and reassembled after service](/__l5e/assets-v1/190c5312-0e33-4132-a1dc-476d659a68e7/swainson-gas-services-boiler-servicing-heat-exchanger-after-02.jpg) [Home](/)[Services](/services)Combi Boiler Servicing Combi Boiler Servicing # Combi Boiler Servicing in Stockport & Greater Manchester Done to Manufacturer Spec. Combis are compact, complex and work hard, heating your radiators or your hot water on demand. An annual specialist service keeps efficiency high, warranty intact, and the plate heat exchanger out of the skip. [Book a service or repair](/contact) [Call 07442 536165](tel:+447442536165) **5.0** Google (36) Gas Safe #9663 Worcester · Vaillant · Ideal · Baxi · Glow-worm covered From £98 inc. VAT Gas Safe registered #9663 Family-run since 1986 12-month workmanship guarantee 5.0 ★ Google (36 reviews) What we do ## Combi Boiler Servicing, done properly. Combi boilers do two jobs: run your central heating and heat your hot water instantly, prioritising hot water when a tap is opened. That combined workload is exactly why they need attention every year. A combi that isn't serviced properly is a combi that starts to lose flow rate on the taps, drop pressure overnight, and eventually chew through a plate heat exchanger long before it should. What it is A combi service covers the same core work as any boiler service, casing off, combustion chamber cleaned, flue gas analysis, gas pressure verified, plus the combi-specific checks: expansion vessel pre-charge, secondary heat exchanger flow rate, diverter valve operation, and system pressure loss patterns. Who it's for Anyone with a wall-hung combi boiler in a house, flat or terrace. Around 80% of properties in Stockport and the surrounding streets run a combi, and every one of them benefits from being looked after by someone who works on that make daily. When you need it Annually, on the anniversary of installation or the previous service. If you've noticed hot water going lukewarm mid-shower, radiators taking longer to heat, or the pressure gauge dropping without an obvious leak, bring the service forward and we can diagnose it in the same visit. Why it matters Combis are unforgiving. Small problems compound: scale narrows a plate heat exchanger by a fraction each year, expansion vessels lose pre-charge, and the diverter valve sticks. Left un-serviced, that's a £400–£700 repair. Caught at service, it's a five-minute adjustment or a modest part. Book a service or repair ### Speak directly to the engineer. from £98 inc. VAT Recent work ## Real jobs, real results. Photographs from recent combi boiler servicing work carried out by John across Stockport and the surrounding areas. ![Boiler heat exchanger heavily sooted before a full service by Swainson Gas Services](/__l5e/assets-v1/fa25bcfa-960f-4fe5-9109-3777dcd2321d/swainson-gas-services-boiler-servicing-heat-exchanger-before-01.jpg) ![Same heat exchanger cleaned and combustion-tested after a full service in Stockport](/__l5e/assets-v1/a0d9a125-d950-4f9c-9d51-2d3f16654c7b/swainson-gas-services-boiler-servicing-heat-exchanger-after-01.jpg) ![Burner assembly fouled with combustion debris before annual service](/__l5e/assets-v1/344d7897-b45d-48a8-bed3-b644422ff42a/swainson-gas-services-boiler-servicing-burner-assembly-before-01.jpg) ![Burner assembly stripped and cleaned by John Swainson after service](/__l5e/assets-v1/cb8bdefe-e670-4bdc-8d1d-acb106e3e60a/swainson-gas-services-boiler-servicing-burner-assembly-after-01.jpg) What happens if it's ignored ## The cost of putting it off. Combis fail in predictable ways when they're not looked after. Every one of the problems below is one we regularly correct in properties that had 'a service last year' from someone who didn't actually open the boiler. ### Falling hot water flow rate Scale silently coats the plate heat exchanger, hot water takes longer, and the shower drops from strong to disappointing. Left long enough, the exchanger is a full replacement. ### Overnight pressure loss A tired expansion vessel or leaking auto air vent shows up as pressure that drops every few days. Un-diagnosed, it eventually locks the boiler out completely. ### Sticking diverter valve The valve that switches between heating and hot water sticks. You get heating but lukewarm water, or hot water but no heating. Common. Preventable at service. ### Voided warranty Every major brand, Worcester Bosch, Vaillant, Ideal, Baxi, requires an annual service. Skip it and the free repair becomes a paid one. Common mistakes we see - Booking the cheapest combi service you can find and not checking whether a flue gas analyser was actually used. - Ignoring gradual hot water performance loss because it 'still works'. - Topping the boiler pressure up week after week rather than getting the underlying leak or expansion vessel diagnosed. Our process ## A clear five-step system. No guessing, no meter-running. Every job follows the same repeatable process, that's how the result stays consistent. 1. 01 ### System check System pressure, expansion vessel pre-charge and pump operation confirmed before we open the casing. 2. 02 ### Combustion strip-down Burner, heat exchanger and injectors cleaned. Combustion chamber inspected for scoring or scale. 3. 03 ### Flue gas analysis Analyser readings taken at low and high fire, the only accurate way to confirm a combi is burning cleanly. 4. 04 ### Water-side checks Diverter valve tested, plate heat exchanger flow rate assessed, sensors verified against manufacturer values. 5. 05 ### Sign-off & report Full written record, workmanship guarantee, and a plain-English summary of anything to keep an eye on. Why it's worth doing ## What you actually get. ### Full-strength showers Keeping the plate heat exchanger clean protects hot water flow rate long-term. ### Stable pressure A properly re-pressurised expansion vessel stops the weekly top-up cycle. ### Warranty protected Annual service logged means the manufacturer can't decline a claim on a technicality. ### Efficient gas burn Combustion-tested boilers hit their SEDBUK efficiency band; neglected ones don't. ### Fewer winter no-heats The mid-January breakdown is almost always something a summer service caught early. ### One engineer, every time The same person services your boiler, remembers its quirks, and returns if it ever fails. In depth ## The detail that matters. Combi boilers all share the same DNA but each brand has its own service quirks. Servicing without brand-specific knowledge is why so many combis get a 'service' one year and a breakdown call-out the next. ### Worcester Bosch Greenstar 30i, 4000, and 8000-series combis all covered. Common service points: expansion vessel pre-charge, condensate trap flush, plate heat exchanger inspection. Genuine Worcester parts fitted where required for warranty compliance. ### Vaillant ecoTEC ecoTEC Plus and ecoTEC Pro models covered. Frequent service issues include diverter valve wear, pressure sensor drift, and expansion vessel pre-charge loss, all addressed at annual service. ### Ideal, Baxi & Glow-worm Ideal Logic and Vogue, Baxi 800/600, Glow-worm Energy and Ultimate, all serviced to manufacturer schedule. Particular attention to Ideal's condensate traps and Baxi's fan assemblies, which are common wear points. ### Old vs new combis Pre-2005 combis (non-condensing) are still supported and serviced honestly, if a part is unavailable or the repair isn't economical, we tell you before we start rather than after we've invoiced. FAQs ## Questions we hear every week. If you have a question that isn't answered here, ring John directly on 07442 536165. ### How much is a combi boiler service? ### How long does a combi service take? ### My combi loses pressure, can you fix that at service? ### Do you service my brand of combi? ### Will servicing keep my warranty valid? ### Can I book a combi service and a landlord CP12 together? ### What if you find a fault during the service? ### How do I book? Related services ## Often booked together. [All services](/services) [ Boiler Servicing & Maintenance Boiler Servicing Learn more → ](/services/boiler-servicing)[ Boiler Repairs & Breakdowns Boiler Repairs & Breakdowns Learn more → ](/services/boiler-repairs)[ Boiler Repairs & Breakdowns Boiler Fault Diagnosis Learn more → ](/services/boiler-fault-diagnosis)[ Boiler Servicing & Maintenance Central Heating Maintenance Contracts Learn more → ](/services/central-heating-maintenance-contract) ![Swainson Gas Services vehicles ready for calls across Stockport and Hazel Grove](/__l5e/assets-v1/160943dc-12df-4f98-9e74-b100ef4b83cc/swainson-gas-services-service-vehicles-fleet.jpg) Ready when you are ## Combi due a proper service? Book John directly. Manufacturer-spec service, genuine parts where required, and the same engineer every time. [Book a service or repair](/contact) [07442 536165](tel:+447442536165) Gas Safe #9663 · 12-month workmanship guarantee · Card on the job ![Swainson Gas Services](/__l5e/assets-v1/2f3afd23-ed83-4d5d-a90b-6d75c9544dc3/swainson-logo.png) Swainson Gas Services Family run · Est. 1986 Stockport's trusted boiler repair, servicing and gas safety specialists. Nearly 40 years on the tools, one engineer, one standard. Gas Safe Registered Registration No. 9663 Services - [Boiler Repairs](/services/boiler-repairs) - [Boiler Servicing](/services/boiler-servicing) - [Landlord Gas Safety Check](/services/landlord-gas-safety-check) - [Emergency Boiler Callouts](/services/emergency-boiler-callouts) - [Central Heating Maintenance](/services/central-heating-maintenance-contract) Areas covered - [Hazel Grove](/areas/hazel-grove) - [Stockport](/areas/stockport) - [Poynton](/areas/poynton) - [Bramhall](/areas/bramhall) - [Cheadle Hulme](/areas/cheadle-hulme) - [Marple](/areas/marple) - [High Lane](/areas/high-lane) - [Sale](/areas/sale) - [Didsbury](/areas/didsbury) - [Offerton](/areas/offerton) - [Woodley](/areas/woodley) - [Bredbury](/areas/bredbury) - [Romiley](/areas/romiley) - [Davenport](/areas/davenport) - [Heaviley](/areas/heaviley) - [Gatley](/areas/gatley) - [Cheadle](/areas/cheadle) - [Disley](/areas/disley) - [Handforth](/areas/handforth) - [The Heatons](/areas/the-heatons) [See all areas & services →](/areas-we-cover) Contact - [07442 536165](tel:+447442536165) - [info@swainsongas.co.uk](mailto:info@swainsongas.co.uk) - Based in Stockport - 7 days a week, 7 AM – 6 PM [](https://www.facebook.com/people/Swainson-Gas-Services/61563360904402/)[](https://www.instagram.com/swainsongas/)[](https://x.com/swainsongas) © 2026 Swainson Gas Services Ltd. Company No. 06431538. All rights reserved. [Privacy Policy](/privacy-policy)[Terms & Conditions](/terms-conditions)[Cookie Policy](/cookie-policy)[5.0 on Google (36 reviews)](https://www.google.com/maps/place/Swainson+Gas+Services+Ltd/data=!4m2!3m1!1s0x0:0x6719107ad0de590a?sa=X&ved=1t:2428&ictx=111) [Call 07442 536165](tel:+447442536165) [Book now](/contact) We use essential cookies to run this site, and optional ones for our chat widget. See our [Cookie Policy](/cookie-policy). AcceptReject