--- title: "Hot Water Cylinder Repair Bolton & Manchester | Conroy" description: "G3 unvented & vented hot water cylinder repair across Bolton & Manchester. PRV, thermostat, anode and immersion faults. Call 07863 789484." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "LocalBusiness", "@id": "https://conroyplumbingandheating.co.uk/#business", "name": "Conroy Plumbing & Heating", "description": "Trusted plumbing & heating engineers with 25+ years experience across Bolton, Manchester & Lancashire.", "url": "https://conroyplumbingandheating.co.uk", "telephone": "+447863789484", "email": "conroy.phr@gmail.com", "image": "https://conroyplumbingandheating.co.uk/logo.png", "logo": "https://conroyplumbingandheating.co.uk/logo.png", "priceRange": "££", "currenciesAccepted": "GBP", "paymentAccepted": "Cash, Bank Transfer, Card", "founder": { "@type": "Person", "@id": "https://conroyplumbingandheating.co.uk/#phil-conroy", "name": "Phil Conroy", "jobTitle": "Gas Safe Registered Plumbing & Heating Engineer", "hasCredential": { "@type": "EducationalOccupationalCredential", "credentialCategory": "Gas Safe Register", "identifier": "962497", "recognizedBy": { "@type": 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A constantly discharging PRV means either the valve has failed or the expansion vessel needs re-pressurising. Both are straightforward repairs." } }, { "@type": "Question", "name": "Do you service Megaflo and Joule cylinders?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — we service all major unvented cylinder brands. Statutory annual servicing is required to maintain manufacturer warranty." } }, { "@type": "Question", "name": "How long does an unvented cylinder service take?", "acceptedAnswer": { "@type": "Answer", "text": "Typically 60-90 minutes. We check pressure, expansion vessel charge, PRV operation, immersions, thermostats, anode condition and discharge pipework." } }, { "@type": "Question", "name": "Can a leaking cylinder be repaired?", "acceptedAnswer": { "@type": "Answer", "text": "Leaks from joints, valves or immersions can be repaired. Leaks from the cylinder body itself usually mean replacement — we'll be straight with you on diagnosis." } }, { "@type": "Question", "name": "What does G3 qualified mean?", "acceptedAnswer": { "@type": "Answer", "text": "G3 is the legal qualification required to work on unvented hot water cylinders. Without it, any work carried out is technically illegal and may invalidate insurance." } } ] }, { "@context": "https://schema.org", "@type": "Service", "name": "Hot Water Cylinder Repair", "description": "G3 qualified vented and unvented cylinder repair across Bolton and Manchester. 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G3 qualified. [Get a Free Quote](/contact)[07863 789484](tel:07863789484) G3 qualified • All cylinder brands • Same-day service available 25+ Years Experience G3 Unvented Qualification All Major Brands Gas Safe Registration Same-Day Service ## Cylinder Faults — Diagnosed and Fixed Properly A hot water cylinder is a sealed, often pressurised vessel under significant thermal and mechanical stress. When something fails — a leaking PRV, a failed thermostat, a tripped immersion or weeping joint — it needs a competent G3 qualified engineer, not a generalist plumber. We diagnose and repair vented and unvented cylinders of every major brand: Megaflo, Joule, Telford, Heatrae Sadia, OSO and others. Most faults are repaired on the first visit; the few that need parts (a specific brand's PRV or thermostat) are usually resolved within 48 hours. Statutory annual servicing of unvented cylinders is also available — required by G3 to maintain manufacturer warranty and ensure ongoing safety. ## Real Work Examples ![Hot water cylinder repair installed by Conroy Plumbing & Heating in Bolton](/images/work-10.jpg) ![Hot water cylinder repair completed by Phil Conroy in Greater Manchester](/images/work-11.jpg) ![Hot water cylinder repair carried out by our Gas Safe engineer in Lancashire](/images/work-12.jpg) ## Common Cylinder Faults Worth Acting On Cylinder faults can range from inconvenient (no hot water from one tap) to genuinely dangerous (a failed PRV on an unvented cylinder can, in extreme cases, lead to vessel failure). Don't ignore the warning signs. - A constantly discharging PRV on an unvented cylinder indicates excess pressure or a failed expansion vessel - Knocking or banging from the cylinder usually means the immersion element is scaled or the anode is exhausted - Brown or rusty hot water indicates internal corrosion — the cylinder may be near failure - Hot water that runs out quickly when it used to last suggests immersion or thermostat failure - Leaks from cylinder joints usually mean failed gaskets, not necessarily a failed cylinder ## Our Process 1 ### Diagnose Full inspection — pressure, temperature, expansion vessel charge, anode condition, immersion element resistance, thermostat function. 2 ### Quote Clear fixed-price quote for the repair. Replacement quoted alongside if the cylinder is near end-of-life. 3 ### Isolate Safely Cylinder isolated, depressurised and drained safely. Mains, expansion vessel and immersions all properly handled. 4 ### Repair Failed component swapped (PRV, expansion vessel, anode, immersion, thermostat) for manufacturer or equivalent specification. 5 ### Recommission Cylinder refilled, vented, pressure-tested, temperature-checked. Discharge pipe tested. Full demonstration to you. ## Why Choose Conroy ### G3 Qualified Unvented cylinder work legally requires G3 — we're qualified, registered and competent. Don't use anyone who isn't. ### All Major Brands Megaflo, Joule, Telford, Heatrae Sadia, OSO, Range — all repaired with the right parts. ### Repair, Don't Replace Most cylinder faults are a £100-200 part, not a £1,500 new cylinder. We'll always quote both. ### Annual Servicing Statutory G3 annual service available — required to maintain warranty and ensure safety. ### Same-Day Where Possible Many faults diagnosed and repaired on the first visit with parts carried on board. ### Workmanship Guarantee All cylinder repairs guaranteed on the workmanship we carry out. ## Technical Detail ### The Pressure Relief Valve The PRV vents excess pressure to a tundish and discharge pipe outside. A constantly weeping PRV means either the valve itself has failed (replace it) or the expansion vessel has lost its charge (re-pressurise or replace). ### Expansion Vessel Maintenance Unvented cylinders need an expansion vessel to absorb the thermal expansion of hot water. The internal air bladder loses charge over time (typically every 3-5 years) and needs re-pressurising or replacing — a standard part of annual servicing. ### Sacrificial Anode The anode is a magnesium or aluminium rod inside the cylinder that corrodes preferentially to protect the steel vessel. Once exhausted (typically 5-10 years), the cylinder itself starts corroding. Anode replacement at service significantly extends cylinder life. ### Immersion Heater Failure Immersion elements scale up in hard water areas and eventually fail. Replacement is typically a 30-45 minute job once the cylinder is drained. We carry common sizes for same-day fitting. ### When to Replace, Not Repair Internal corrosion (rusty water), pinhole leaks from the cylinder body, repeated component failures, or a cylinder over 15 years old usually mean replacement is the right call. We'll always be honest about which side of the line your cylinder is on. ## Frequently Asked Questions ### My unvented cylinder is constantly dripping outside — is that normal? ### Do you service Megaflo and Joule cylinders? ### How long does an unvented cylinder service take? ### Can a leaking cylinder be repaired? ### What does G3 qualified mean? Looking for something else? Phil also covers [24/7 emergency plumbing](/services/emergency-plumbing), full [boiler installation](/services/boiler-installation) and [boiler repairs](/services/boiler-repairs), annual [boiler servicing](/services/boiler-servicing), [central heating installation](/services/central-heating-installation), [power flushing](/services/power-flushing), [leak detection](/services/leak-detection) and landlord [gas safety certificates (CP12)](/services/gas-safety-certificates). Browse the full list on our [services page](/services) or see [recent jobs](/our-work) and [customer reviews](/reviews). Based in Bolton, we work across [Bolton](/areas/bolton), [Manchester](/areas/manchester), [Bury](/areas/bury), [Blackburn](/areas/blackburn), [Chorley](/areas/chorley), [Wigan](/areas/wigan), [Preston](/areas/preston) and [Salford](/areas/salford). See [all areas we cover](/areas), learn more [about Phil Conroy](/about), or [get in touch for a free quote](/contact). ### Related Services - [Unvented Cylinders](/services/unvented-cylinders) - [Immersion Heater Replacement](/services/immersion-heater-replacement) - [Cold Water Tank](/services/cold-water-tank) - [Boiler Repairs](/services/boiler-repairs) ### Areas We Cover - [Bolton](/areas/bolton) - [Manchester](/areas/manchester) - [Bury](/areas/bury) - [Blackburn](/areas/blackburn) - [Darwen](/areas/darwen) - [Chorley](/areas/chorley) - [Wigan](/areas/wigan) - [Preston](/areas/preston) - [Salford](/areas/salford) - [Oldham](/areas/oldham) - [Rochdale](/areas/rochdale) - [Stockport](/areas/stockport) - [Warrington](/areas/warrington) - [Chester](/areas/chester) - [Leigh](/areas/leigh) ![Professional plumbing and heating equipment ready for installation](/images/cta-bg.jpg) ## Ready to Get This Sorted Properly? Speak directly to Phil. No call centres, no scripts — just honest advice, fair pricing, and work you can rely on. [Get a Free Quote](/contact) [Call 07863 789484](tel:07863789484) ![Conroy Plumbing & Heating](/logo.png) A trusted, family-run plumbing and heating business with over 25 years of experience serving Bolton, Manchester, and the wider Lancashire area. [](https://www.instagram.com/conroy.phr/)[](https://maps.app.goo.gl/PBieeQnZb43zAv1Y7) ### Our Services - [Emergency Plumbing](/services/emergency-plumbing) - [Boiler Installation](/services/boiler-installation) - [Boiler Repairs](/services/boiler-repairs) - [Boiler Servicing](/services/boiler-servicing) - [Central Heating](/services/central-heating-installation) - [Gas Safety Certificates](/services/gas-safety-certificates) - [Leak Detection](/services/leak-detection) - [Power Flushing](/services/power-flushing) - [Plumber](/services/plumber) - [Gas Engineer](/services/gas-engineer) - [Renewables](/services/renewables) ### Company - [About Us](/about) - [Our Work](/our-work) - [Reviews](/reviews) - [Specials](/specials) - [Blog](/blog) - [Contact](/contact) - [Privacy Policy](/privacy-policy) - [Cookie Policy](/cookie-policy) - [Terms & Conditions](/terms-conditions) - [Complaints Policy](/complaints-policy) ### Areas We Cover - [Bolton](/areas/bolton) - [Manchester](/areas/manchester) - [Blackburn](/areas/blackburn) - [Bury](/areas/bury) - [Chorley](/areas/chorley) - [Preston](/areas/preston) - [Wigan](/areas/wigan) - [Salford](/areas/salford) ### Get in Touch - [07863 789484 ](tel:07863789484) - [conroy.phr@gmail.com](mailto:conroy.phr@gmail.com) - 14 Prestbury Rd, Bolton BL1 8SA Available 24/7 for emergency callouts _\*Conroy PHR LTD is an Introducer Appointed Representative of TradeHelp for the purpose of credit broking introductions only. Our firm reference number is 1059442. TradeHelp is a trading style of TradeHelp Ltd, Marchwiel Centre, Bryn Lane, Wrexham Ind Est, LL13 9UT, registered in England (03712438), authorised and regulated by the Financial Conduct Authority (firm reference number 697812). TradeHelp are a credit broker, not a lender, and offer loans from a small panel of carefully selected lenders. TradeHelp do not offer financial advice and do not charge you for credit broking services. All loans are subject to status._ © 2026 Conroy Plumbing & Heating. All rights reserved. [Privacy Policy](/privacy-policy)[Cookie Policy](/cookie-policy)[Terms & Conditions](/terms-conditions)[Complaints Policy](/complaints-policy) [Call Now](tel:07863789484)[Free Quote](/contact) [WhatsApp us ](https://wa.me/447763993607?text=Hi%20Conroy%20Plumbing%20%26%20Heating%2C%20I'd%20like%20a%20quote%20please.) We use essential cookies to run this site, plus optional cookies from embedded forms and reviews. 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