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Posted by David on April 10, 2007 at 16:38:37:
I have a Burnham PV713WT-TBWR boiler (1998)
This problem just begin 1 month ago.
When I try to take a shower or fill the tub, the hot water comes out but then goes to warm and then cold within about 3min.
If I shut off the water for about 5 min, nothing happens to the temp in the boiler, but I regain hot water again before it drops off in another 3 min
When I look at the temp on the guage at the boiler, the water temp which started at 210 only drops to about 200 but I'm not getting any more hot water.
In that 10 deg. temp drop I see the pressure drop from about 70psi to about 50psi
nothing else is wrong. Radiator Heat comes up fast and heats rooms without any noticable problems.