Miles wrote:
OK I'm no expert but I will try to describe this problem as best I can:

The central heating system in our house is a fully-pumped, open-vented
Y-plan system. Now it should be possible to have either the central
heating or the hot water on separately, shouldn't it? The problem we are
experiencing is that the radiators start to warm up when only the hot
water is on.


pluber brother in law : "there's a lot of heat to dissipate, it's got to go somewhere"

hth

RT