My 7year old Burnham MPO147 boiler was absolutely fine for years. But it s tarted leaking water out of the pressure relief valve (aka T&P valve) last week. A slow trickle would start whenever the boiler would fire. I quickl y noticed the expansion tank had rusted through on the air bladder side (yi kes!) so I drained the system and replaced the expansion tank with the same make/model as the old one and refilled/purged the lines. So it's all func tional again... but, the T&P valve still leaks when the boiler fires now, o nly just less now. Since it only leaks when the boiler fires, I can't imag ine there's crud in the T&P valve keeping it open. There have been no othe r changes to the water supply or anything else. Did I somehow damage the T &P valve by causing it to leak? Any ideas or suggestions are appreciated! Regards, Theodore.
- posted
10 years ago