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Old 08-30-2010, 01:27 PM   #1
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Filling the hot water heater

Based on what I've heard/read, I drain most of the water out of my camper (i.e. water tank and hot water heater) if it's going to be more that a few weeks in between trips. When I next fill with water, do I need to have a hot water faucet open for the hot water heater to fill or will it fill properly without a faucet open?


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Old 08-30-2010, 01:30 PM   #2
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Open a fauset to fill the HOT water lines and tank.
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Old 08-30-2010, 01:31 PM   #3
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It will not fill if it doesn't have a way to vent the air out, so as Mike said, open a hot water faucet to vent the air out while you fill the heater.
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Old 08-30-2010, 01:38 PM   #4
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Quote:
Originally Posted by Bama Rambler View Post
It will not fill if it doesn't have a way to vent the air out, so as Mike said, open a hot water faucet to vent the air out while you fill the heater.
Vent. That's the word I was looking for. Vent.
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Old 08-30-2010, 02:11 PM   #5
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I was told by the dealer, when doing the walk thru, that if we make sure that water is flowing from the release valve on the water heater that it's safe to turn it on. Is that correct?
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Old 08-30-2010, 02:51 PM   #6
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Release valve? He might have meant relief valve. If you deliberately opened the relief valve to vent, and then allowed water to flow out, you are ready to fire up the heater. There will still be air in the hot lines that will vent when you open hot water valves later. If the relief valve is leaking when closed, you may have a bad valve.

Either way, I never thought twice about this issue and never had a problem. I hook up water, go inside and double check all valves are closed, open the city water spigot, go back in and check for leaks as i vent the kitchen sink faucet. Good enough.
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Old 08-31-2010, 11:51 AM   #7
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Technically it a T&P relief valve (Temperature & Pressure). It'll open at either high temp or high pressure. Enough about that though!

Once the water is that high it's safe to fire it off. The burner tube and the electric element are both under water and the t-stats will be sensing correctly.
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Old 08-31-2010, 01:43 PM   #8
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dont forget to check your bypass lines!
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Old 08-31-2010, 01:50 PM   #9
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dont forget to check your bypass lines!
What exactly are bypass lines? Are you referring to other water lines that don't go to the water heater? How do you check them?
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Old 08-31-2010, 01:59 PM   #10
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You will have a cold water and hot water line connected to the water heater. If there is a pipe connecting these together, that is the bypass line. There will be valves on all 3 lines.
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