Ah, you may find it is not an indirect cylinder then. the purpose of the indirect cylinder is to pass the heat from the central heating water to the domestic hot water without contaminating it.
It could well be that it is a direct cylinder that doesn't actually have a coil fitted in it just two connections to allow the water to circulate. sounds a real Heath Robinson affair.
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Dave...
Lost a few stones  and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident
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