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Yes there is a large storage tank fed by the rising main and a seperate much smaller tank fed by the rising main. The hot water tank has a 22mm pipe going in the bottom, this comes from the large storage tank - I guess it has two 22mm pipes in the side ( I can not see them) and one 22mm...

Can anyone help - this is a wierd one. When timer set for constant hotwater I get hot upstairs radiators and no hot water - downstairs rads stay cold. When I set timer full 24 hour heating and 24 hour hot water - I get hot radiators throughout and still no hot water. The timer is of the...