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Posted by jcwhui on September 24, 2010 at 16:14:48:
Hi, I am a new house owner. The house has an 40+ year old boiler. When I lifted the flap of the pressure relief valve, it released lots of water (very black at the beginning). That's good. But then it didn't close, water kept coming out. I am pretty sure the valve is too old and needs to be replaced.
The old one is Watts 174A-M3, 3/4". Spec: 30 PSIG, 650,000 BTU Per Hour. (Picture: http://images.drillspot.com/pimages/313/31308_300.jpg).
Same one in the Internet costs about US$70.
A similar one I can find at local store is 335-M1, 3/4". Spec: 30 PSIG, 510,000 BTU Per Hour, costs CAD$15. (http://www.amresupply.com/images/sku/150/PartImage36150254365465996369260.jpg)
My question is: while their specs are about the same, but they look quite different. Old one is quite bulky. Can I use the new one instead of ordering the exact same one from the Net?
P.S. When the service guy came and max'ed all thermostats, the pressure went to 30, but still the valve didn't release any water. That's why I flipped it. And now I'm in trouble. :(
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