I have a 28 year old two-speed grundfos super 4 pump which has recently started making a noise and becoming hot. The central heating has been off over most of the summer. I had the boiler thermostat turned right down as this still heated the hot water satisfactorily(convection).
I have now turned up the boiler thermostat
as I thought I was maybe overworking the pump. It is still heating up and making a noise. Any causes for this, or is it most likely time for a new pump? Is this type of pump still available?
I have now turned up the boiler thermostat
as I thought I was maybe overworking the pump. It is still heating up and making a noise. Any causes for this, or is it most likely time for a new pump? Is this type of pump still available?