--- title: "Oil Boiler Servicing: Broad Town, Marlborough & Swindon | BTD" description: "OFTEC-registered oil boiler service across Broad Town, Royal Wootton Bassett, Marlborough and Swindon. From £115 plus parts. Free written quote, Gas Safe & OFTEC C11108." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "PlumbingService", "name": "BTD Plumbing & Heating", "image": "/__l5e/assets-v1/5c2a8a57-5312-4450-b2c7-21ccea3eb146/btd-favicon.png", "url": "/", "telephone": "07920 042880", "email": "info@btdplumbingheating.co.uk", "priceRange": "££", "address": { "@type": "PostalAddress", "streetAddress": "Pye Lane", "addressLocality": "Broad Town", "addressRegion": "Wiltshire", "postalCode": "SN4 7RR", "addressCountry": "GB" }, "geo": { "@type": "GeoCoordinates", "latitude": 51.498686, "longitude": -1.8718 }, "openingHoursSpecification": [ { "@type": "OpeningHoursSpecification", "dayOfWeek": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" ], "opens": "00:00", "closes": "23:59" } ], "sameAs": [ "https://www.facebook.com/btdplumbingandheating" ], "areaServed": [ { "@type": "City", "name": "Broad Town" }, { "@type": "City", "name": "Royal Wootton Bassett" }, { "@type": "City", "name": "Broad Hinton" }, { "@type": "City", "name": "Lyneham" }, { "@type": "City", "name": "Wroughton" }, { "@type": "City", "name": "Marlborough" }, { "@type": "City", "name": "Yatesbury" }, { "@type": "City", "name": "Swindon" }, { "@type": "City", "name": "Calne" } ] }, { "@context": "https://schema.org", "@type": "WebSite", "name": "BTD Plumbing & Heating", "url": "/", "publisher": { "@type": "Organization", "name": "BTD Plumbing & Heating", "logo": "/__l5e/assets-v1/5c2a8a57-5312-4450-b2c7-21ccea3eb146/btd-favicon.png" }, "potentialAction": { "@type": "SearchAction", "target": "/services?q={search_term_string}", "query-input": "required name=search_term_string" } }, { "@context": "https://schema.org", "@type": "Organization", "name": "BTD Plumbing & Heating", "url": "/", "logo": "/__l5e/assets-v1/5c2a8a57-5312-4450-b2c7-21ccea3eb146/btd-favicon.png", "contactPoint": [ { "@type": "ContactPoint", "telephone": "07920 042880", "contactType": "customer service", "areaServed": "GB", "availableLanguage": [ "en-GB" ] } ], "sameAs": [ "https://www.facebook.com/btdplumbingandheating" ] }, { "@context": "https://schema.org", "@type": "Service", "name": "Oil Boiler Servicing", "serviceType": "Oil Boiler Servicing", "description": "OFTEC-registered oil boiler service across Broad Town, Royal Wootton Bassett, Marlborough and Swindon. 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Written quotes are free." } }, { "@type": "Question", "name": "How long does a service take?", "acceptedAnswer": { "@type": "Answer", "text": "Between 60 and 90 minutes for most domestic boilers. Older or heavily sooted units, and boilers that haven't been serviced for several years, can take longer, we'll tell you before we start, not after." } }, { "@type": "Question", "name": "How often should an oil boiler be serviced?", "acceptedAnswer": { "@type": "Answer", "text": "Every 12 months. That's the requirement of every UK manufacturer's warranty and every landlord insurance policy we've seen." } }, { "@type": "Question", "name": "Do you service oil boilers you didn't install?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, every day. Most of the boilers we service were installed years before we ever met the owner." } }, { "@type": "Question", "name": "Are you OFTEC registered?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: OFTEC business registration C11108, technician registration 28212, with 18 years on the tools." } }, { "@type": "Question", "name": "Will my warranty still be valid?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. All work is carried out to manufacturer specification and OFTEC standards, and you'll receive a written service report to keep on file." } }, { "@type": "Question", "name": "What if you find a fault during the service?", "acceptedAnswer": { "@type": "Answer", "text": "We'll show you the issue, explain what's causing it and give you a clear price to fix it. 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From £115 plus parts. Free written quote, Gas Safe & OFTEC C11108.", "provider": { "@type": "LocalBusiness", "name": "BTD Plumbing & Heating", "telephone": "07920 042880", "email": "info@btdplumbingheating.co.uk", "address": { "@type": "PostalAddress", "streetAddress": "Pye Lane", "addressLocality": "Broad Town, Swindon", "addressRegion": "Wiltshire", "postalCode": "SN4 7RR", "addressCountry": "GB" } }, "areaServed": [ "Broad Town", "Royal Wootton Bassett", "Broad Hinton", "Lyneham", "Wroughton", "Marlborough", "Yatesbury", "Swindon", "Calne" ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much does an oil boiler service cost?", "acceptedAnswer": { "@type": "Answer", "text": "Services start from £115. If parts are needed on top, nozzle (always replaced), flexi hoses, fuel filter, gaskets, those are added at cost and shown separately on the invoice. 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Most of the boilers we service were installed years before we ever met the owner." } }, { "@type": "Question", "name": "Are you OFTEC registered?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: OFTEC business registration C11108, technician registration 28212, with 18 years on the tools." } }, { "@type": "Question", "name": "Will my warranty still be valid?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. All work is carried out to manufacturer specification and OFTEC standards, and you'll receive a written service report to keep on file." } }, { "@type": "Question", "name": "What if you find a fault during the service?", "acceptedAnswer": { "@type": "Answer", "text": "We'll show you the issue, explain what's causing it and give you a clear price to fix it. Nothing gets replaced without your say-so." } }, { "@type": "Question", "name": "Do you cover my area?", "acceptedAnswer": { "@type": "Answer", "text": "We regularly service oil boilers across Broad Town, Royal Wootton Bassett, Broad Hinton, Lyneham, Wroughton, Marlborough, Yatesbury, Swindon and Calne. Just outside? Call us, we'll happily tell you either way." } }, { "@type": "Question", "name": "Can you service my oil tank at the same time?", "acceptedAnswer": { "@type": "Answer", "text": "Every service includes a visual tank, fire-valve and fuel line check. If the tank itself needs attention, we can quote for a repair, replacement or relocation on the same visit." } }, { "@type": "Question", "name": "Can I get an emergency service if my boiler has failed?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: emergency call-outs are available. Give us a ring and we'll be straight with you about how quickly we can be there." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://btdplumbingheating.co.uk" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://btdplumbingheating.co.uk/services" }, { "@type": "ListItem", "position": 3, "name": "Oil Boiler Servicing", "item": "https://btdplumbingheating.co.uk/services/oil-boiler-servicing" } ] } ] --- Open 24/7 · 7 days a week [info@btdplumbingheating.co.uk](mailto:info@btdplumbingheating.co.uk) [07920 042880](tel:07920042880)[](https://www.facebook.com/btdplumbingandheating) [![BTD Plumbing & Heating](/__l5e/assets-v1/61f32ae6-1a6e-43c3-b1ad-85dbc02e87a2/btd-logo.png) ](/) [Home](/)[About](/about) [Services](/services) [Service Areas](/areas) [Our Work](/our-work)[Reviews](/reviews)[Contact](/contact) [07920 042880](tel:07920042880) [](tel:07920042880) ![Green floor-standing oil boiler installed in a utility room with insulated copper flow and return pipework, system filter and flue](/__l5e/assets-v1/eefd2c9f-b2f4-4cf7-bb66-5a8f2dd94adb/oil-boiler-servicing.jpg) Oil-fired heating specialists # OFTEC oil boiler servicing across Broad Town & rural Wiltshire Keep your oil boiler running cleaner, safer and cheaper to run, a full OFTEC service by a specialist who has done it every winter for eighteen years, from £115 plus parts. [Request a Free Quote](#quote) [07920 042880](tel:07920042880) OFTEC C11108 · Technician 28212 · 18 years' experience · Free written quote 1. [Home](/) 2. [Services](/services) 3. Oil Boiler Servicing - £115 Service from - C11108 OFTEC business - 28212 OFTEC technician - 18 years Experience - Free Written quote Overview ## A straight explanation of what we do, and why it matters An annual oil boiler service is the single most important thing you can do to keep your heating reliable, efficient and safe. It's a proper stripped-down clean, combustion analysis and parts check, not a five-minute look and a signature. [Back to home](/) What it is A full OFTEC-standard service covers the burner and combustion head, nozzle, electrodes, photocell, fuel pump pressure, flue integrity, boiler casing seals, safety controls and combustion gas analysis. Everything is cleaned, tested against manufacturer settings and recorded on your service report. Who it's for Any home, farm building, holiday let or workshop across Broad Town, Royal Wootton Bassett, Marlborough, Calne, Wroughton and the surrounding villages running an oil-fired boiler: Worcester, Grant, Firebird, Warmflow, Trianco, Mistral, Boulter, HRM and every other UK brand. When you need it Every 12 months. The best time is late summer or early autumn, get it done before the first cold snap and you avoid the queue that forms the moment heating season starts. If your boiler is stalling, sooting up, running noisy or the smell of oil is stronger than usual, don't wait for the anniversary. Why professional matters Oil combustion is fussy. A dirty nozzle, worn electrodes or a partially blocked flue quietly waste fuel, foul the heat exchanger and shorten the life of the boiler. A proper service pays for itself in efficiency and in the breakdowns that never happen. ![Grant UK G1 Approved Installer badge](/__l5e/assets-v1/ead0d224-79ca-42b0-bc45-7d793e4cddbd/grant-g1-installer.jpg) Manufacturer accredited ## Grant UK G1 Approved Oil Boiler Installer We're a Grant UK G1 Approved Installer, recognised by Grant for our installation standards, technical expertise and commitment to ongoing manufacturer training. Every Grant oil boiler we fit is installed in accordance with the manufacturer's recommendations, giving you the performance, reliability and efficiency the unit was designed to deliver. Choosing a G1 Approved Installer also means eligible Grant boilers can qualify for Grant's extended manufacturer guarantees, giving you added peace of mind and long-term protection on your new heating investment. - New installations & replacements - Annual servicing & maintenance - Extended manufacturer guarantees on eligible models - Installed to Grant UK's exact specifications The cost of leaving it ## What happens when it's ignored The cost of skipping a service isn't the service; it's what happens when the boiler finally protests, usually on the coldest weekend of the year. Risks & escalations - Sooting inside the heat exchanger drops efficiency fast; you burn more oil for the same warmth. - A worn nozzle or fuel pump running out of spec can produce unburnt fuel, smoke and sooty deposits that eventually shut the boiler down on lockout. - Blocked flueways and failed seals can allow combustion gases to spill back into the plant room, a genuine safety issue, not a paperwork one. - Manufacturer warranties are conditional on annual servicing. Miss one and a big-ticket claim can be refused outright. - Deferred servicing turns a £115 job into a callout, parts bill and, in the worst cases, a new boiler two winters earlier than needed. Common mistakes - Assuming a boiler that 'still fires up' is fine. Efficiency losses are invisible until you compare fuel bills year on year. - Booking a 'service' with a general handyman who isn't OFTEC registered, combustion analysis and nozzle sizing are not guesswork. - Leaving it until December. Every oil engineer in Wiltshire is booked solid the moment the frost arrives. - Skipping the fuel filter and tank check. Dirty oil is the number one cause of avoidable breakdowns. Booked once a year, in daylight, on your timetable, an oil service is one of the quietest bits of home maintenance you'll ever pay for. Skipped for two, it's one of the loudest. Our process ## A clear, five-step system, no surprises 1. Step 1 Pre-service checks Visual inspection of the boiler, flue, oil line, isolation valves and tank. Confirm previous service history and any faults you've noticed. 2. Step 2 Strip-down and clean Remove the burner, clean the combustion head, baffles and heat exchanger, replace the nozzle, check electrodes, photocell and fuel pump filter. 3. Step 3 Combustion analysis Fire the boiler and take a full flue gas analysis, CO, CO2, oxygen, smoke number and efficiency, and adjust to manufacturer spec. 4. Step 4 Safety and controls test Verify overheat stat, flame failure lockout, thermostat operation, expansion vessel pressure and, on sealed systems, PRV integrity. 5. Step 5 Report, warranty & sign-off Complete a written service report, hand over any parts replaced, log the visit against your warranty and book in next year if you'd like. The benefits ## Concrete outcomes, not vague promises Lower fuel bills A correctly tuned burner runs at the efficiency the manufacturer promised | not the 8–15% below it that sooted-up boilers drift to. Warranty protected Serviced to OFTEC standard, on time, with paperwork. Your manufacturer warranty stays fully valid. Fewer breakdowns Nine out of ten winter callouts come from boilers that missed their last service. A £115 visit prevents most of them. Cleaner combustion Analyser-verified CO, CO2 and smoke | safer for you and easier on the heat exchanger. Boiler lasts longer Regular servicing routinely adds years to an oil boiler's working life. Neglect halves it. Genuine OFTEC service Not a 'check-over'. A full strip, clean, tune and test carried out by an OFTEC-registered technician. In detail ## The technical stuff, explained straight Where the theory meets the van. Materials, methods, brand differences and the specific situations we deal with week in, week out across Wiltshire. ### What actually happens during an OFTEC service The nozzle is the smallest and most-abused part on the boiler, a precision-machined atomiser that turns oil into a fine mist for combustion. It wears every hour it runs. Standard practice is to replace it every service and match it to the size, angle and spray pattern listed by the manufacturer for that boiler and burner combination. Electrodes are cleaned and re-gapped, the photocell is polished, the fuel pump filter is renewed and pump pressure is checked with a gauge. The combustion head is stripped, baffles pulled, heat exchanger vacuumed and internal seals inspected. Once rebuilt, the boiler is fired and an electronic flue gas analyser is used to record CO, CO2, oxygen, smoke number, flue temperature and net efficiency. Those readings, not a hunch, dictate any adjustments to air, pressure or nozzle sizing. ### Servicing by boiler brand We service every UK oil boiler brand, Worcester Bosch Greenstar Danesmoor, Grant Vortex, Firebird Enviroblue, Warmflow, Trianco TRO/TRG, Mistral, Boulter Camray, HRM Wallstar and older Riello-burnered models. Each has its own quirks: Grant Vortex boilers need particular attention to the baffle set and combustion chamber liner; Worcester Danesmoors reward careful fuel line servicing; Firebird kit is sensitive to nozzle sizing. Eighteen years' experience across the full range means the right settings and the right spare parts go on the van before we arrive. ### Kerosene, gas-oil and biofuel considerations The overwhelming majority of Wiltshire homes run on 28-second kerosene. Some older agricultural and commercial buildings still run 35-second gas oil. HVO (hydrotreated vegetable oil) is becoming available for suitably converted burners. We can service and adjust all three, and advise on whether your current burner is HVO-compatible or would need a conversion kit if you're considering the switch. ### Tank, fuel line and filter | the parts most services skip A boiler is only as clean as the oil feeding it. Every service includes a check of the tank sight-gauge, water content, external condition, fire-valve and remote isolation, plus a filter change on the oil line. Sludge in the tank and water at the bottom cause more nozzle failures and lockouts than the boiler itself. If your tank is over ten years old, we'll flag it and give you an honest opinion on whether it needs attention now or another season. ### Landlord oil safety certificates and holiday-let servicing Rented properties on oil aren't covered by the CP12 gas certificate, but landlords still carry a duty of care under the Housing Act, and most insurers require annual servicing on record. We issue landlord oil safety certificates (OFTEC CD/11) alongside a written service report you can file for compliance and share with tenants. FAQs ## The questions we're asked most Can't see yours? Give us a ring; we don't do sales scripts. [Call 07920 042880](tel:07920042880) How much does an oil boiler service cost? Services start from £115. If parts are needed on top, nozzle (always replaced), flexi hoses, fuel filter, gaskets, those are added at cost and shown separately on the invoice. Written quotes are free. How long does a service take? How often should an oil boiler be serviced? Do you service oil boilers you didn't install? Are you OFTEC registered? Will my warranty still be valid? What if you find a fault during the service? Do you cover my area? Can you service my oil tank at the same time? Can I get an emergency service if my boiler has failed? ![Zoned central heating manifold with low-loss header and multiple circulator pumps installed by BTD](/__l5e/assets-v1/fd044ba2-ab75-43f3-b2a9-47d21fc77e28/work-11.jpg) Free written quote · no pressure ## Book your oil boiler service before the cold catches you out. A quick call now, a free written quote, and one less thing on the list before winter. No pressure, no sales patter. - Gas Safe 529962 - OFTEC C11108 - 18 years' experience [07920 042880](tel:07920042880)[Request a Free Quote]() Related services ## Often booked alongside Oil Boiler Servicing [All services](/services) [ Oil Boiler Repairs ](/services/oil-boiler-repairs)[ Oil Boiler Installation ](/services/oil-boiler-installation)[ Power Flushing ](/services/power-flushing) ![BTD Plumbing & Heating](/__l5e/assets-v1/61f32ae6-1a6e-43c3-b1ad-85dbc02e87a2/btd-logo.png) Oil-fired heating specialists and fully qualified gas engineers, serving Broad Town and rural Wiltshire since 2007. [](https://www.facebook.com/btdplumbingandheating)[Leave a review](https://search.google.com/local/writereview?placeid=ChIJRZWCvZdDcUgRtf3uEv2z_ME) ### Services - [Oil Boiler Servicing](/services/oil-boiler-servicing) - [Oil Boiler Repairs](/services/oil-boiler-repairs) - [Oil Boiler Installation](/services/oil-boiler-installation) - [Gas Boiler Servicing](/services/gas-boiler-servicing) - [Gas Boiler Repairs](/services/gas-boiler-repairs) - [Gas Boiler Installation](/services/gas-boiler-installation) - [Water Softener Installation](/services/water-softener) - [Central Heating Systems](/services/heating) - [All services →](/services) ### Service Areas - [Broad Town](/areas/broad-town) - [Royal Wootton Bassett](/areas/royal-wootton-bassett) - [Broad Hinton](/areas/broad-hinton) - [Lyneham](/areas/lyneham) - [Wroughton](/areas/wroughton) - [Marlborough](/areas/marlborough) - [Yatesbury](/areas/yatesbury) - [Swindon](/areas/swindon) - [Calne](/areas/calne) ### Contact - [07920 042880](tel:07920042880) - [info@btdplumbingheating.co.uk](mailto:info@btdplumbingheating.co.uk) - Pye Lane, Broad Town, Swindon, SN4 7RR Gas Safe Reg. 529962 OFTEC Reg. C11108 · Tech. 28212 City & Guilds Qualified Grant UK G1 Approved Installer © 2026 BTD Plumbing & Heating. All rights reserved. [About](/about)[Contact](/contact)[Privacy](/privacy-policy)[Terms](/terms-conditions)[Cookies](/cookie-policy)Open 24/7 · Mon–Sun [Call Now](tel:07920042880)[Request Quote](/) We use essential cookies to make this site work, plus optional ones for our chat widget. See our [cookie policy](/cookie-policy). AcceptEssential only