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Central Heating
Hot water being back flowing into Cold water tank
Anonymous user 13 April 2017 - 8.47 PM
Any advice would be extremely appreciated. I have an indirect heating system. A few days ago the large cold water tank overflow started to leak. Given that I had the ball-cock replaced 6 months ago I kinda knew it was not the problem - it was not. When the water is being heated on its own it is raising the water level in the large cold water tank up to a point where it overflows down the pipe at the roof eves. This happens over a period of a 90 mins (water is only heated for 20 mins). Having looked in the tank I can see that water is being backfilling the large cold water tank not via the open vent pipe but the pipe at the bottom of the tank where the cold water should flow to the Cylinder. When the hot water is off (not heating water) the large cold water tank level remains as it should. Any ideas why this is happening???? I have had no new taps or mixers installed and this has only happened (as far as I know) in the past few days
3 answers from MyBuilder tradespeople
before replacing your hot water cylinder you need to have the cylinder stat check if it's faulty or not working it would cause your water in the tank to overheat above the set temperature hence it rising up through the expansion pipe releasing the pressure on your copper cylinder. .
Answered
20 April 2017
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Inside you hot water cylinder is a 'heat exchanger' that has ruptured causing the problem you have described. Best call your plumber or better still a heating engineer to replace the hot water cylinder as repairs are not possible only replacement!
Answered
14 April 2017
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stat gone and overheating
Answered
3 May 2017
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