Repair-first fault finding
Unvented hot water cylinder repairs.
No hot water, dripping tundish, low pressure, leaks, valve and immersion faults on Megaflo and all the major unvented cylinders, diagnosed at the cause and fixed properly by G3-qualified engineers across Wetherby, Leeds, Harrogate, York and surrounding areas.
Faults we repair
Find the cause. Fix it once.
Unvented cylinders are pressurised and protected by safety controls, so the right approach is methodical: identify the cause rather than swapping parts until the symptom disappears. If your cylinder is a Megaflo specifically, see our dedicated Megaflo repairs page. New here? Start with our common faults guide.
No hot water
Immersion heaters, thermostats, programmers, wiring and safety cut-outs tested in order, and we explain why it failed, not just what failed.
Tundish discharge
Dripping or running tundish traced to expansion, incoming pressure or safety valve causes so the discharge doesn't simply return.
Low or odd pressure
Inlet controls, strainers and pressure reducing valves inspected for restriction or failure, with readings taken, not guessed.
Leaks
Connections, valves, expansion vessels, immersion bosses and pipework assessed carefully, with repair options explained before any work.
Immersion & controls
Failed elements, faulty thermostats, tripping cut-outs and programmer issues, including faults that have been misdiagnosed before.
Valves & expansion
Pressure reducing valves, temperature and pressure relief valves, expansion vessels and recharges: the heart of a healthy unvented system.
Before the visit
Two minutes of photos can save you a call-out.
Photos usually tell us the cylinder make, age and which components are involved, so we can give honest advice up front and arrive with the right parts first time.
1. The cylinder data label
Tells us the make, model and capacity, and which parts fit.
2. The tundish & discharge pipe
A photo of any drip helps us judge urgency honestly.
3. The valve set & expansion vessel
The pipework around the top of the cylinder tells the real story.
4. Any leak or staining
Plus a wider shot of the cupboard so we can see access.
Brands we work on
All the major unvented cylinder brands.
Megaflo (Heatrae Sadia), Gledhill, OSO, Santon, Telford, Range Tribune, Ariston, Joule, Vaillant and similar unvented cylinders, repaired and serviced with the correct parts and settings for each system.
Why G3 matters here
- Unvented cylinders store hot water at mains pressure. The G3 qualification exists because mistakes on these systems are dangerous. It's the legal benchmark for installing and working on them. Always ask for it; we'll happily show ours.
Misdiagnosed before?
- A good share of our repair visits follow someone else's parts-swapping. Thirty years of fault finding means awkward, intermittent and "we've had three plumbers" faults are familiar territory.
Honest about replacement
- If a cylinder genuinely isn't worth repairing, we'll show you why, explain your options and give you a straight price, never a scare story. And because we install too, the same engineer can supply and fit the new one.
Recent work
Two thermostats, an element and a scale reducer.
A recent repair on a Santon Premier Plus unvented cylinder: two new thermostats and a new immersion element fitted, plus a scale reducer to give the new element a fighting chance in hard water. Tested, cover back on, and the cupboard left as we found it.
Get your hot water sorted.
Call for urgent faults, or WhatsApp photos for a fast first diagnosis, often before we've even been out.
Book a repair
Tell us what the cylinder is doing.
Covering Wetherby, Leeds, Harrogate, York, Tadcaster, Knaresborough and nearby villages.
No call-out fee. You only pay from when we arrive. Please note: diagnostic work is chargeable, and in the rare case we're unable to complete a repair, a diagnostic fee will still apply.