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Khite
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| Joined: | Wed Aug 27th, 2008 |
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Posted: Wed Aug 27th, 2008 08:57 pm |
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So I have one of these state censible 510e Water heaters. Recently it started discharging Water from the relief valve every night while I am in bed. It is on a timer, but I cant understand why it would start doing this all of a sudden.
Any suggestions?
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eleent
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| Joined: | Sat Sep 11th, 2004 |
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Posted: Wed Aug 27th, 2008 11:39 pm |
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Hello: It is fairly unlikely the heater is attempting to inturrept your sleep  The relief valve operates with too much pressure or too much heat. When it goes off, check and see if the discharged water is quite hot. If so, we need to find out why. If not, the pressure is out of whack and we need to find out why. In any event it really is the nature of plumbing to sit quietly for years then do stuff all of a sudden 
Yours, Larry
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Khite
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Posted: Thu Aug 28th, 2008 12:47 pm |
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The water is quite warm - even by the time I get to it.
Any suggestions on how to eliminate this - not sure how much city water I lose every time this goes off, but I think my water bill will feel it.
I didnt think it was trying to interrupt my sleep, but rather be sneaky about the time it decited to go off
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energyexpert
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Posted: Thu Aug 28th, 2008 01:58 pm |
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Do you have an expansion tank? With a timer on your heater you start with most of the water being cold. As you heat it it expands. If you did not have a timer the WH would come on several times a day and heat (and expand) just a little; pressure would not build too much. But after you go to bed the timer comes on, no water is being used so the pressure builds.
Are you on time of use rates? If not how many hours a day (24 hours) is the timer set to run? Rewiring the power supply to 120 volts (vs 240) would give you the same hot water as being wired at 240 and the timer set "on" for 6 hours/day. Rewiring to 120 volts would probably eliminate the need for an expansion tank.
David
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energyexpert
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Posted: Thu Aug 28th, 2008 02:00 pm |
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Forgot to add: If you rewire to 120 volts you would just bypass the timer.
David
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Khite
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Posted: Thu Aug 28th, 2008 02:03 pm |
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| Thanks David, I will give that a try!
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eleent
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Posted: Thu Aug 28th, 2008 03:48 pm |
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Hello: The best humor is indistinguishable from the truth. Water always obeys the laws of physics, likely for this very reason I'm agreeing with Dave that an expansion tank is good to consider. If you put a pressure gauge on the tank drain valve and sat up all night to watch it, (or got one that has a separate red needle to record the high point) you would know for sure whether that pressure is the culprit. If it is, putting an expansion tank in the cold line could curtail the nightly escapades. Does that seem censible?
Yours, Larry
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