Our Glowworm Energysaver has started to kettle noticeably just before the boiler thermostat kicks in and switches it off. Turning the thermostat down does not seem to make much of difference unless it is set so low that the output temp is only 65 degrees (in which case it takes hours to heat a tank of hot water).
I guess it could be a partially blocked heat exchanger allowing some paths through the exchanger to boil before the return temperature rises high enough to trigger the thermostat?
Either way, can we continue using the boiler in this condition? Will it cause issues for the rest of the system (all new rads and pipework fitted this summer)?
I was hoping to get a few more months out of the boiler before replacing with a viessmann or WB but I am starting to suspect its days are numbered.
iep
I guess it could be a partially blocked heat exchanger allowing some paths through the exchanger to boil before the return temperature rises high enough to trigger the thermostat?
Either way, can we continue using the boiler in this condition? Will it cause issues for the rest of the system (all new rads and pipework fitted this summer)?
I was hoping to get a few more months out of the boiler before replacing with a viessmann or WB but I am starting to suspect its days are numbered.
iep