I am looking to replace my hot water tank with a larger one and possibly replace pipework from cold water tank in loft to hot water tank.
On investigation the expansion pipe from the hot water cylinder appears to tee off by the cold water tank and returns via a cavity wall to the bathroom. My query is what does this extended pipe run do if anything??
House was built in the fifties and pipework appears to be original.
Grateful for any indications.
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