![]() Let us know if you can observe any of the conditions I’ve suggested. If so, this may suggest that there is a leak in the heating coil within the tank and needs fairly urgent attention. If you notice the copper cylinder overflow pipe leaking, the usual culprits are the copper cylinder coil or your thermostat setting. The washer is usually submerged in water, and it wears out quickly. The overflow pipe of the hot water or copper cylinder connects to the cold water tank and allows for the expansion of the cylinder as the water is heated. If it does, this may suggest that hot water is being sent up this overflow, being dumped into the header tank and then flowing out of the overflow from the loft. The overflow pipe can leak due to a worn-out washer. This is the cylinder with the little lift switch usually mounted atop the tank with the drain line attached. If you can reach this vertical pipe a couple of feet higher than the tank, it shouldn’t feel as hot as where it exits the tank. 2 Answers Sorted by: 4 Since your question says hot water, not steam escaping from overflow, my first thought would be to check for a faulty high pressure relief valve. Normally this pipe will run out of the top, then turn horizontally, with the hot water tap running, this pipe will be hot to the touch (please be careful you don’t burn your hand if you have any sensory deprivation) if you follow this pipe, very soon you will find a tee joint, to a copper pipe that runs directly upwards into the loft. If you can get easy access to your hot water cylinder, (the tank that’s quite possibly located in the airing cupboard) turn on a hot tap, then go to the hot water cylinder and see if you can locate the pipe that runs directly out of the top of it. Something else that you may be able to check, with the boiler running and hot water set to ‘on’. The dripping relief pipe youre noticing is probably experiencing normal thermal expansion, but it could also have a faulty valve. ![]()
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