Unvented cylinder repair
Unvented cylinder repair service
Fix faults fast and keep your unvented cylinder safe, reliable, and efficient with expert repairs from our trusted G3-certified team, protecting your hot water supply and your system’s warranty.
Our 4-step unvented cylinder repair
Diagnosis
We begin with a full inspection of your cylinder to identify faults, pressure issues, or safety concerns. No guesswork, clear expert diagnosis from the start.
Compliance checks
Before any repair begins, we carry out G3-compliant safety checks to ensure your system is operating within legal and manufacturer standards.
Repair
Our qualified team carry out all repairs using top quality parts, whether it's a faulty valve, thermostat, immersion heater, or pressure issue.
Final check
Once the repair is complete, we test the entire system to confirm it's running safely and efficiently. We’ll also offer advice to help prevent future breakdowns.
8 times out of 10 we'll fix it on the first visit
Over 80% of hot water cylinder repairs are fixed on the first visit thanks to our expert engineers, fully stocked vans, and years of experience, saving you time, stress, and money.
Always the best deals from our partners
Extended warranty & 0% interest free credit
If you need a new cylinder, our MAX accreditation lets us offer extended warranties from leading partners with 0% interest finance options, making your hot water upgrade easier and more affordable.
Can't find the answer? Please get in touch
This could be due to a faulty immersion heater, thermostat, motorised valve, or an issue with the expansion vessel or pressure. A qualified engineer can quickly diagnose and repair the problem.
No. Unvented systems are pressurised and must only be worked on by a G3-certified engineer. DIY repairs can be dangerous and may invalidate your building insurance or warranty.
Most common faults can be repaired within 1–2 hours on the first visit. However, if specialist parts are needed, it may take longer depending on availability and system complexity.
Not necessarily. Many issues, like failed thermostats, valves, or expansion vessels, can be repaired. A full replacement is only recommended if the cylinder is damaged or corroded internally.
Costs vary depending on the fault and any parts needed. As every issue is different, we can’t give a repair price before inspection, but we’ll always provide a clear quote first.