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Old 09-27-2013, 05:46 PM   #1
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Water level - does it include the water heater's 6 gallons

That's the question. When you fill up with fresh water, is a portion of that going into the water heater or is that drawn in when the heater is turned on. There's been so many times that we fill up and not long after, the gauge shows we're a lot lower than we should be. I know it could be the gauge itself (or the sensor), but wondered if it might have to do with the heater.
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Old 09-27-2013, 06:16 PM   #2
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That's the question. When you fill up with fresh water, is a portion of that going into the water heater or is that drawn in when the heater is turned on. There's been so many times that we fill up and not long after, the gauge shows we're a lot lower than we should be. I know it could be the gauge itself (or the sensor), but wondered if it might have to do with the heater.
When you fill up the fresh water tank nothing flows to the water heater or anywhere else unless you have the water pump turned on.
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Old 09-27-2013, 06:56 PM   #3
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I am not sure how Airstream counts fresh water capacity. My experience with other travel trailer mfg's is that they count the 6 gallon water heater in the capacity specification. For example if the trailer has a 20 gal fresh water tank the trailer mfg will say that the trailer has a 26 gal fresh water capacity. If the water heater is empty it will take 6 gal from the fresh water tank to fill it before you have hot water. With the water heater full and the fresh water tank full, you still only have a 20 gal usable capacity.
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Old 09-27-2013, 11:06 PM   #4
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Thanks for the replies. When you do a systems check and get a water reading though, does it also account for what's in the water heater (with or without the pump on)?
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Old 09-28-2013, 01:16 AM   #5
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Hi, let's say that your trailer's water system is empty. You fill your fresh water tank. Your gauge [if it still works ] should read full. Your water heater is still empty. Turn on your water pump and your water heater is still empty, so do not turn the water heater on. Open all water faucets [one at a time] to remove the air from the system. With a hot water valve open, water will then go into your water heater. Now that your system has purged the air out, and your water heater is full, now refill/top-off your fresh water tank and you will have as much water as possible. Airstream gives you the fresh water tank size and the water heater holds an extra 6 gallons. Never turn on your water heater when it is empty.
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Old 09-28-2013, 01:44 AM   #6
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Hi, let's say that your trailer's water system is empty. You fill your fresh water tank. Your gauge [if it still works ] should read full. Your water heater is still empty. Turn on your water pump and your water heater is still empty, so do not turn the water heater on. Open all water faucets [one at a time] to remove the air from the system. With a hot water valve open, water will then go into your water heater. Now that your system has purged the air out, and your water heater is full, now refill/top-off your fresh water tank and you will have as much water as possible. Airstream gives you the fresh water tank size and the water heater holds an extra 6 gallons. Never turn on your water heater when it is empty.
Boom!!! Now that's information my friend!! Thanks
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Old 11-13-2013, 02:28 PM   #7
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As a follow-up to the question and answers, how does the water heater tank work when connected to a city inlet hose, and no fresh water is in the fresh water tank?
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Old 11-13-2013, 02:45 PM   #8
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The plumbing system has two potential inputs: either from the fresh water tank via the water pump, or from the city water supply. So the water hear can be filled by either source, but the process for purging air from the system is the same either say, as described above.
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Old 11-13-2013, 02:50 PM   #9
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Unless you drain the WH it will stay full or at least almost full. Emptying the fresh water tank leaves the WH with water in it.
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Old 11-13-2013, 03:24 PM   #10
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The water capacities listed in the documentation does NOT include the water in the HW tank. Once the HW tank is filled, I consider it "lost" in the system. If you go boondocking and fill up your FW tank you will be able to draw on all of that water. When the FW tank is empty, you are out of water even though you still have 6 gallons in your HW tank.

When you open a HW faucet something has to push the water out. Your water pump will do this with the water in the FW tank but once it is gone you won't get anything out of the faucet. Same as when you are hooked up to city water. Open the faucet and the city water pressure will push the water through the coach.

Every spring when I de-winterize I hook up to city water to flush out the system, to fill the HW tank and to remove all the air in the lines. The HW tank is filled and remains so until I winterize in the fall.
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Old 08-05-2016, 09:40 PM   #11
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Ok maybe you can help me. I cannot seem to get the air out of the lines. The water heater has never been used (2016 22 FB Bambi) so I am trying to learn the plumbing. Sanitized the system but cannot get beyond spurting u s ING the water pump. Have talked with factory techs. They say bad pump or air leak. No water leaks. What am I missing?
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Old 08-05-2016, 09:55 PM   #12
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Ok maybe you can help me. I cannot seem to get the air out of the lines. The water heater has never been used (2016 22 FB Bambi) so I am trying to learn the plumbing. Sanitized the system but cannot get beyond spurting u s ING the water pump. Have talked with factory techs. They say bad pump or air leak. No water leaks. What am I missing?
Hook up to city water, open all faucets and turn on the pump, disconnect the city water, close all taps. Pump should be primed.

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Old 08-05-2016, 10:20 PM   #13
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I would say you have air entering the system on the suction side of the pump.
Make sure the FW tank is not empty. City water will not prime your pump.
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Old 08-06-2016, 02:16 AM   #14
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If there is a leak on the inlet side of the pump it well suck air instead of leak water. So like TG Twinkie said above use city water and test your system if it works correctly then find your suction leak that feeds the pump. It well be between the pump and the fresh water tank.
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