I'm putting some more insulation in the loft including the pipework. Over both the cold water storage tank and the central heating expansion tank is an expansion pipe. A previous attempt has been made to insulate the cold water one but not the central heating one.
Do either of them actually need insulating? My understanding is that normally there will be no flow of water there anyway.
They need insulating up to the level of water in the tank, and then a bit higher to protect against conduction along the copper. They need the thicker grade insulation to protect pipes with no flow (as do all the pipes associated with the tanks). I would run it up to the top of the loop, or at least 12" above the tank water level, whichever is lower.
That makes sense. I was confusing 'no flow' with 'empty' when I was trying to get my head round this!
Thanks
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