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Old 09-15-2012, 05:18 PM   #1
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Water heater use

We have a new RV with a DSI gas / electric water heater. To ensure there is water in the tank prior to starting the water heater, is it enough to just run a hot tap (with water pump on) until water flows fairly easily without a lot of sputtering? Or should I do something with pressure relief valve also? Thanks!
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Old 09-15-2012, 05:55 PM   #2
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Quote:
Originally Posted by paulmlac
We have a new RV with a DSI gas / electric water heater. To ensure there is water in the tank prior to starting the water heater, is it enough to just run a hot tap (with water pump on) until water flows fairly easily without a lot of sputtering? Or should I do something with pressure relief valve also? Thanks!
Do through pressure relief valve while filing tank
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Old 09-15-2012, 06:46 PM   #3
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How long would I hold up the valve and let water flow out? Thanks!
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Old 09-15-2012, 07:06 PM   #4
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To add a little to Turbo's post. It is always a good idea to get a little water out of the pressure relief valve when filling your tank. A little air up near the top isn't bad, but it is possible to have water at the faucets and still not have water in the water heater. That could happen if you still have the bypass valves set for winterization. Getting some water out of the pressure relief valve is a way to make certain the tank is full.

Just a little dab will do ya.
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Old 09-16-2012, 04:54 PM   #5
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For the heater tank, it draws water from the fresh tank or city water hookup?
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Old 09-16-2012, 05:43 PM   #6
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For the heater tank, it draws water from the fresh tank or city water hookup?
Which ever water supply you are using. The city water supply typically connects with the camper water pipes near the onboard water pump outlet.
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Old 09-16-2012, 07:11 PM   #7
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How long would I hold up the valve and let water flow out? Thanks!
Just move the lever for the pressure relief valve a little. Water should dribble out right away when the hot water tank is full.

Don't flip the lever trying to fully open the valve. This is a pressure relieve valve not an on off valve. If you keep playing with this valve, the seal will probably go bad and end up with a leak/drip and then it's time for replacement.
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Old 09-16-2012, 08:31 PM   #8
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Good advice here! If the PR valve dribbles, you're safe.
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Old 09-16-2012, 10:15 PM   #9
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Thanks for the advice. In playing with the pressure relief valve this weekend, I noticed the following:

- When I had the water pump on, hot water tap off, & lifted the valve, no water came out from the valve

- When I had the water pump off, hot water tap on, & lifted the valve, water came out from the valve

Not sure if that's normal or correct but that's what it was doing.
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Old 09-17-2012, 12:40 AM   #10
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Which ever water supply you are using. The city water supply typically connects with the camper water pipes near the onboard water pump outlet.

Thank you.
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