I've got a 2 year old ISAR HE 35 boiler which to be honest has been nothing but a problem since we've had it! The biggest problem we have at the moment is that when the hot water is run there is a large audible bang from the flue (louder outside than when inside house) much like a car back firing, and the boiler will produce hot water, but only if the taps are run slowly. When having a shower the water is hot for a while, then becomes cold, then after a while heats up again.
Any ideas folks?
Any ideas folks?