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Heatstore expansion\feed tank overflow problem
shellards
Posts: 1 Newbie
I have an underfloor heating system based on a heat store which indirectly heats hot water which passes through a coil in the tank.
My problem is that the overflow for the feed and expansion tank above the heat store has recently started to run. The ballcock shut off in the feed/expansion tank is fine. I have checked the immersion thermostat on the heat store which is also fine. From my observation the additional water is coming from the feed pipe as distinct from the vent pipe which arches into the top of the tank. It is my understanding that this would happen normally as the water in the tank heats and expands; however the amount of water entering the header tank would appear to be excessive.
The system has run without evident problems for several years. This problem has emerged in recent months and overflow appears to be happening with increasing frequency.
Overflow is undoubtedly related to the cycling of the boiler and is most evident when the central heating pump is not cycling - i.e. when water is specifically being heated for hot water and heat is not being diffused by circulation in the central heating system.
Post Script: I am pretty sure now that the problem is arising from a leak in the heat exchange coil which provides hot water to the taps. I think this is leaking into the heat store. Guess I'll have to replace the whole tank. Any other suggestions?
My problem is that the overflow for the feed and expansion tank above the heat store has recently started to run. The ballcock shut off in the feed/expansion tank is fine. I have checked the immersion thermostat on the heat store which is also fine. From my observation the additional water is coming from the feed pipe as distinct from the vent pipe which arches into the top of the tank. It is my understanding that this would happen normally as the water in the tank heats and expands; however the amount of water entering the header tank would appear to be excessive.
The system has run without evident problems for several years. This problem has emerged in recent months and overflow appears to be happening with increasing frequency.
Overflow is undoubtedly related to the cycling of the boiler and is most evident when the central heating pump is not cycling - i.e. when water is specifically being heated for hot water and heat is not being diffused by circulation in the central heating system.
Post Script: I am pretty sure now that the problem is arising from a leak in the heat exchange coil which provides hot water to the taps. I think this is leaking into the heat store. Guess I'll have to replace the whole tank. Any other suggestions?
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