I've been studying how to maintain and fix this boiler. The boiler started to drain out massive water out of the overflow pipe when the boiler reach the certain temp. After seeing that the TPR is the problem, and with many sites saying that it is cheap to replace and easy as using a pipe ranch. I tried to take if off, but seems to be stuck on pretty well, and it has a rubber piece that covers the end of the TPR to the tank. Can't tell if it could be screwed off.
Could it be that this model has a different way to replace the TPR, or is there just one way by screwing it off? Maybe I just need to keep tugging on it?