![]() ![]() This rise in water levels can then lead to the feed and expansion tank overflowing. Over time, this coil can become perforated, meaning there's hole in the coil which allows water for the central heating into the domestic hot water being stored in the cylinder. As the hot water passes through the coil at the top, its heat is transferred to the domestic hot water, warming it further, before it exits at the bottom of the coil – known as the flow and return. Within the cylinder is a coil that hot water for the central heating system passes through. Hot water cylinders store hot water for domestic use from taps and showers. If your system has an ABV yet hot water is still making its way to the header tank then it might be set too high. To avoid this, heating systems should have an Automatic Bypass Valve (ABV) which allows the hot water to circulate even when the valves are closed. This can mean that the pump is attempting to do this when the valves are closed and the only place for the hot water to go is up to the header tank. Most modern boilers have this important feature which prevents heat from building on the heat exchanger. Pump over run is when the boiler continues to pump for a few minutes after the central heating or domestic hot water is turned off. Ball valve needs repairing or replacing.There are many reasons why the header tank is overflowing: It's possible for the cold feed and open vent pipes to be a single pipe in some cases. Connection to the mains water supply via a ball valve. ![]() They're located at the highest point of the heating system, usually in the loft, alongside the larger cold water storage tank.Īs well as the tank that stores the water, header tanks are made up of: The role of the header tank is to supply water to the central heating system and also maintain the level of water, which expands when heated. The header tank, otherwise known as the feed and expansion tank or cistern, is an essential part of an open vented central heating system with a regular boiler. ![]()
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