Unvented Cylinder Servicing & Repair in North Devon

An unvented cylinder is why you can run the kitchen tap without turning someone's shower cold, and why there's no tank sat in your loft. They're good things. They also store a lot of hot water under mains pressure, which is why the law says only a G3-qualified engineer touches them, and why they want looking at once a year.

I hold that qualification, and I service and repair them across Barnstaple and all of North Devon. Not sure whether yours is unvented? Ring me and describe what's in the airing cupboard: I can usually tell you over the phone.

You'll get an answer. Ring or message during the working day and you'll hear back the same day; evenings and weekends, it'll be the next working day. And if it isn't a job for me, I'll tell you that and point you at someone who can help, rather than going quiet on you.

When you book, I'll confirm it and give you a two-hour window rather than a whole day sat at home waiting. On the morning you get a text with a tracking link, so you can see where I've got to instead of wondering. Traffic and the job before yours are real, so it's a window rather than a promise to the minute, but if it slips you'll hear it from me first.

I'll cover up where I'm working, clear up after myself, and run the boiler through a full cycle before I go. You get the house back as you left it, minus the fault.

The paperwork comes on the day, not a fortnight later: a written record of what I checked, what I tested and what I found. Gas safety certificates go over by email the same day, which is what a letting agent, an insurer or a buyer's solicitor will ask you for.

Parts I fit are guaranteed for 12 months, and that covers the labour to put it right as well as the part. What it doesn't cover is the rest of a boiler I didn't supply, boilers over 10 years old, or damage caused by sludge and scale in the system. If any of that applies to yours, I'll tell you before the work, not after it.

An unvented cylinder stores hot water at mains pressure: unlike a traditional vented cylinder, which relies on a cold water tank in the loft to create gravity-fed pressure. The main practical difference is shower and tap pressure: unvented systems deliver consistent mains-pressure hot water everywhere in the house simultaneously.

Common brands in North Devon homes: Megaflo (by Heatrae Sadia), Vaillant uniSTOR, Ariston, Gledhill, Albion, and OSO.

These systems work at significantly higher pressures than vented systems. That's why the installation, servicing, and repair of unvented cylinders is regulated. A poorly maintained system can build dangerous pressure levels. Annual servicing isn't a recommendation; it's a safety and legal requirement.

An annual service checks every safety device and component that keeps the system operating safely:

After the service, I'll issue a written service record. If any component needs replacing, I'll tell you before touching it.

Unvented cylinder repair for leaking relief valves, failed expansion vessels, immersion faults and hot water pressure that has dropped off.

Megaflo service and repair. Megaflo is the most common unvented cylinder in North Devon, and I am G3 qualified to service and repair it along with the other main brands.

Hot water cylinder repair covering cylinders, coils, thermostats and controls, including immersion heater replacement with the thermostat and stat pocket where those need doing at the same time.

Expansion vessel replacement on boilers and unvented cylinders, with the system repressurised properly afterwards rather than left to the next person.