Hi guys
This might be a really silly question but I have a gem superior 95 boiler in the house.
There is a green switch on it which says HW on one side and HWCH on the other side.
Just wondering what is this for,its currently set at the HW.
Just a guess but I'd say they stand for Hot Water and Hot Water +Central Heating. The HW would heat the tank for a shower and the HWCH will send water to the radiators.