Unvented cylinder installation and repair in Chesterton

It means a safety valve is discharging, usually a failed expansion vessel or a faulty pressure reducing valve. It needs looking at rather than ignoring.

Annually. The expansion vessel charge, safety valves and immersion heater are all checked, and it keeps the manufacturer warranty valid.

Usually yes, if the incoming mains flow supports it. We flow test the main first and tell you honestly whether you will get the performance you want.

Yes, including seized elements in older cylinders, with the cylinder drained and refilled and the thermostat set correctly.

Unvented hot water cylinders store water under mains pressure, so Building Regulations Part G3 requires the installation and any work on the safety controls to be carried out by a competent, G3 registered engineer. We hold that qualification, so installations are notifiable, documented and legal.

The tundish is the open funnel in the discharge pipe, so anything running through it means a safety device has opened. Usually it is the expansion vessel losing its charge, a failed pressure reducing valve, or a passing temperature and pressure relief valve. It is not a leak to ignore, because the cylinder is telling you the pressure or temperature control has failed.

Annually. The service checks and re-charges the expansion vessel, tests the temperature and pressure relief valve and the expansion relief valve, checks the pressure reducing valve, inspects the immersion heater and thermostat, and confirms the discharge pipework is still compliant. Skipping it is how cylinders end up dumping water through the tundish.

Yes. Cylinder replacement is a job in its own right, whether you are swapping a failed unvented cylinder like for like or upgrading an old vented copper cylinder. We check the boiler output and the incoming mains flow first so the new cylinder is matched to what the house can actually supply.

Usually yes, and it is one of the biggest improvements you can make to hot water in an older house. It means removing the loft tanks, running new mains-fed pipework, and confirming the incoming mains flow rate will support your bathrooms. Where the mains is weak we would talk about an accumulator or a booster instead of promising pressure the main cannot deliver.

Yes. Megaflo installation, servicing and repairs are a regular part of our work, along with Heatrae Sadia, Telford, Gledhill, Joule and OSO cylinders. Common Megaflo repairs are expansion vessel or air gap re-charge, immersion heater replacement and relief valve renewal.

On an unvented system that usually means the pressure reducing valve or the strainer is partly blocked, or the cylinder has scaled up. On a vented gravity system, low hot water pressure is normal because it is fed from a loft tank, and the fix is either a shower pump or a conversion to a pressurised cylinder.

Yes. Immersion heater repair and replacement, expansion vessel replacement, external expansion vessels where the internal air gap can no longer be re-charged, and pressure relief valve renewal are all standard jobs. Where the cylinder itself has failed we say so rather than fitting parts to something that is finished.