Hello all
We've just replaced our hot water cylinder for a new one. The cylinder is an indirect version replacing a primatic one. The heating coil is fed from the boiler via gravity. The first six feet of pipe from the boiler (supply and return ) is 22mm feeding into the original pipework which is 28mm. We seem to have an air lock in the cylinder heating coil and would appreciate any suggestions on how we can clear it.
Many thanks Helen