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Old 08-13-2016, 07:07 PM   #1
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How to fill the water heater

We just purchased a Flagstaff T21QBHW A frame camper. I was wondering how I can tell if the water heater is filled. Can I just open the hot water spigot and know that the tank is full when water without air comes out? Does the hot water tank fill from either city water or the water storage tank?
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Old 08-13-2016, 07:15 PM   #2
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We just purchased a Flagstaff T21QBHW A frame camper. I was wondering how I can tell if the water heater is filled. Can I just open the hot water spigot and know that the tank is full when water without air comes out? Does the hot water tank fill from either city water or the water storage tank?
Make sure bypass valves are in the right position and open the pressure relief valve until water comes out.
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Old 08-13-2016, 07:19 PM   #3
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Some great info on hot water heates. Scroll down to see about the valves Old Coot referenced.
I have two on mine, one to allow water into the heater (bottom valve), one for hot water from the heater (TOP valve) and just before these valves is a pipe that connects the cold to the hot water lines. This allows the water heater to be bypassed.
Suburban's electric switch and much more
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Old 08-14-2016, 02:20 PM   #4
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Thanks! I looked at my setup and it appears to be the same arrangment. Mine also has two small valves in hot and cold lines going through the floor that probably go to the outside shower. I'll have to check that. Looks to me that I should be able to open the sink hot water spigot, with the city water or the pump turned on, and wait until water with no air comes out. Didn't see any easy way to drain the hot water tank. Is there a way?
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Old 08-14-2016, 02:27 PM   #5
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The anode rod. Looks like a large nut (I believe 1 1/16") at the bottom of the water heater tank, stand off to the side, unscrew and pull the anode rod. And I say stand to the side, water will come out a good three feet. Also, that anode rod can fly out so be careful.


When winterizing the trailer in the winter, drain the hot water heater tank, then turn the valves to bypass the tank and then add the anti-freeze. That way you are not winterizing the hot water tank and using a bunch of anti freeze. If the tank is drained no hard will come to it.
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Old 08-14-2016, 02:34 PM   #6
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You need to drain it by removing the outside panel and take out the anode (if you have one) or remove the plug. Make sure the heating element is turned off, the water has cooled and release the pressure valve. Stand to the side when you remove the anode as the water will gush out. You may want to get a hot water tank rinse attachment for your garden hose for rinsing out the mineral deposits out the tank and check the anode for corrosion. I always carry a spare anode. You may not need to replace it but one to two times a year (if that) based on how often you camp and the quality of the water in the parks.

Edit: It appears that f5moab was responding at the same time I was so his post beat me out! His pictures are very helpful
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Old 08-14-2016, 03:02 PM   #7
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Thanks for your posts. They help a lot. Are replacement anodes easy to come by?
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Old 08-14-2016, 03:33 PM   #8
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This is another option, but you'll need an adapter to fit the larger hole in your heater.
Camco RV Water Heater Anode Rod w/ Drain - 1/2" Diameter x 4-1/2" Long Camco Accessories and Parts CAM11533
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Old 08-14-2016, 03:51 PM   #9
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Thanks for your posts. They help a lot. Are replacement anodes easy to come by?
You can get anode rods at any RV place or Home Depot/Lowes/Menards, etc.
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Old 08-14-2016, 04:03 PM   #10
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Don't forget to turn off all city water faucets and your water pump first. (Don't ask)
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