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Old 12-16-2012, 11:37 AM   #1
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Water Heater help

I bought a new Puma t-trailer and its been nice so far. But iv notice the water heater dosnt hold hot water very long at all. You could take a good shower in my old RV, but this one only last about three minutes with hot water. I dont under stand why I get so much less hot water. It is a propane unit. Is there something about these new heaters I don't know about. Thanks for any help.
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Old 12-16-2012, 12:06 PM   #2
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Bypass valve?
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Old 12-16-2012, 12:23 PM   #3
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Check By-pass valve, make sure outside shower/faucest are closed or it will mix cold wayer into the system, make sure you water heater is filling and not air bound in head space. It it plenty hot when you first turn is on? Does the burner run alot?
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Old 12-16-2012, 12:29 PM   #4
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Size of water heater?
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Old 12-16-2012, 02:19 PM   #5
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Maybe the original tt had electric and propane.
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Old 12-16-2012, 08:33 PM   #6
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I don't have a shower out side. I have a 5 gal. heater and my old one was also a 5 gal. propane heater. Nether have or had electric. Theres no air in it that I know of. I don't think its running allot, but I think its turning on and off more then it should when its trying to heat.
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Old 12-17-2012, 09:47 AM   #7
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Check the bypass valve. Assuming single handle, move it to by-pass and back again to make sure it moves without much resistence. If you need to double check for proper operation, empty tank and leave plug out, by-pass and run pump to make sue it is being by-passed. Now reverse valve and make sure it fills quickly. When full, you can always lift the pressure relief valve to purge air. Of couse none of this is necessarily the problem.

You said it cycles while heating, which is not normal. Once hot to proper temp, it should be hours before coming on unless being used.

That said, it sounds like one of the thermoswitches are malfuctioning. The brown wire coming in is the power line. It runs to the t'stat switch first. If the tank is cool enough, it closes and sends power to the ECO switch. If the water is hot enough, the power ends there and nothing happens. When the temp drops enough, the switch closes sending power to the control board which fires up the heater. Then the above process goes again until the ECO switch opens killing the operation.

So, the problem could be either of these switches are bad. These switches come in kits and I think less than $20. I always carry extras.
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Old 12-22-2012, 06:11 AM   #8
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It runs to the t'stat switch first. If the tank is cool enough, it closes and sends power to the ECO switch. If the water is hot enough, the power ends there and nothing happens. When the temp drops enough, the switch closes sending power to the control board which fires up the heater. Then the above process goes again until the ECO switch opens killing the operation.
Under normal circumstances, the t-stat will be the only switch that opens ... at 140. Should it fail, the Energy Cut Off switch should open at 190.
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Old 12-30-2012, 04:01 PM   #9
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Check By-pass valve, make sure outside shower/faucest are closed or it will mix cold wayer into the system, make sure you water heater is filling and not air bound in head space. It it plenty hot when you first turn is on? Does the burner run alot?

I'm having virtually the same problem. I'm not familiar with the by-pass valve. What am I looking for?
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Old 12-30-2012, 04:08 PM   #10
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It sounds like it has the 120 deg. thermostat. With the lower temp thermostat you have to use more hot water than cold and run out faster. You can call the manuf. and they will send you a 140 deg.
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Old 12-30-2012, 04:09 PM   #11
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May I suggest a low flo shower head? Maybe your past unit had one. I put one in my mh and now both myself and DW can take a shower without running out. I have a 6 gal wh.
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Old 12-30-2012, 04:35 PM   #12
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fvstringpicker check this link has pictures of different types of bypass valves and locations.
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