I am looking to move an upstairs radiator and so need to (partially at least to ground floor) drain the central heating system down. It's a system that heats up a combi tank (that also seems to double up as an electric immersion tank). The tank and boiler are both in the loft.
But I cannot find any drain off valve anywhere. And none of the radiators have drain valves either.
Does anyone have any tips on how to drain it down??