This may have been asked but it is baffling me.
My boiler - very old baxi bermuda back boiler which as boiler settings 1-5 (5 max). The boiler is for the CH and HW. If I set the temp to 4 or 5 and the room thermostat is set on 25, there is very little kettling from the boiler once the room temp has been reached. But if I set the room temp to say 21 or 22, the boiler kettles extremly loud (some banging noises from the pipes as well) when the room temp is reached. But if I set the boiler temp to 2 and keep the room temp at 22, the boiler does not kettle (the only problem with this it takes longer for the rads to heat up).
Is this a case that the boiler (pump) cannot pump the water around quick enough and therefore the boiler overheats the water or is it something else.
Please please help.
My boiler - very old baxi bermuda back boiler which as boiler settings 1-5 (5 max). The boiler is for the CH and HW. If I set the temp to 4 or 5 and the room thermostat is set on 25, there is very little kettling from the boiler once the room temp has been reached. But if I set the room temp to say 21 or 22, the boiler kettles extremly loud (some banging noises from the pipes as well) when the room temp is reached. But if I set the boiler temp to 2 and keep the room temp at 22, the boiler does not kettle (the only problem with this it takes longer for the rads to heat up).
Is this a case that the boiler (pump) cannot pump the water around quick enough and therefore the boiler overheats the water or is it something else.
Please please help.