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Could any one help with this one, 1) im changing my CH system to a sealed/unvented system from a conventional tank system. could someone post me a drawing/schematic of a sealed system denoting pressure valves/pumps/boiler/rads etc 2) im also changing my HW system to a sealed/unvented...

Dear All, Does any one know where i can buy a coil for the gas solinoid, for my glowworm 70b (or potterton Puma 80e, its the same solenoid coil), it is part of the gas control valve, and is the smaller of the two solenods, it has two long screws clamping it to the rest of the solinoid unit...