I have a Vaillant ecotec plus 637 boiler installed about 5 yrs ago as a S plan plus unvented installation.
Question I have is the room stat is 1.5C below the set level (20C) but the boiler flow temperature is around 42C when the target is set at 60C. The boiler is oversized and I set the power to 14KW which has worked over the years. I was expecting the boiler to continue to fire up until either target flow or room temperature stat levels reached. This doesn't seem to be happening. Is this normal?
Question I have is the room stat is 1.5C below the set level (20C) but the boiler flow temperature is around 42C when the target is set at 60C. The boiler is oversized and I set the power to 14KW which has worked over the years. I was expecting the boiler to continue to fire up until either target flow or room temperature stat levels reached. This doesn't seem to be happening. Is this normal?