I'm new to the group so I apologize if there is a FAQ for this
somewhere. For the last week or so, I've noticed a daily discharge of
water from the temperature & pressure relief valve on my gas water
heater (50 gal. RUUD Powervent). It's enough water to fully soak a
bath towel. The way my discharge line is setup the water flows across
a portion of the vinyl floor to the drain. It leaves a nice sized
puddle without laying down a towel.
Any ideas besides a bad T&P valve? What would be a ballpark estimate
for repair? (The water heater was warranty replacement in '00).
Thanks for the feedback,
Since it's intermittent, probably not a bad T & P valve.
Most common cause is thermal expansion causing a jump in
pressure. This can be caused by very high city water pressure
or by some device in the service line which acts as a check valve.
To find out for sure what's going on, you need to put a pressure
gauge on the system. Watch what it does when the heater fires
and no water is being used.
You may need an expansion tank or a combination of a pressure
reducing valve *and* an expansion tank.
More info here:
Or do a GOOGLE Groups search here for "expansion tank"
That site makes expansion tanks so what would you suppose they would
I don't know of a single house here that uses expansion tanks, guess
we don't have an active dealer in expansion tanks. On the other hand,
our T&P valves don't seem to leak either (unless they go bad which is
seldom) although our normal pressure is around 80 psi.
For the problem to develop, there must be some device in the
service line, such as a backflow preventer or reducing valve which
can create a "closed" system. For whatever reason your neighborhood
doesn't have them (I assume) so doesn't have this problem.
However, in millions of homes the problem *does* exist and needs
to be addressed. Count yourself lucky...
If the water discharge is a new development and no one had messed with
the valve prior to this new developement, then the valve is bad and
needs to be replaced. If you call a plumber that is what he will do
at a cost of about $65 to $70 in my area. Ontheotherhand, the valve
cost about $15 and if you can get to it easily you can replace it in
about 15 minutes using a pipe wrench.
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