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Old 10-09-2012, 03:23 PM   #1
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Water heater bypass

I am winterizing my 2007 378 for the first time. I reached into the compartment for the water heater and closed the one valve I could find. However, when I removed the anode a second time (after draining the tank) just to check, I was spayed with pressurized antifreeze.Why did the tank fill? Did I miss a valve?
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Old 10-09-2012, 03:38 PM   #2
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It depends on your bypass system.

There are 1 valve systems; 2 valve systems and 3 valve systems.

I have photos of the 1 valve and 3 valve systems.

The only difference from a 2 valve and a 3 valve is there is a check valve in the line where the top valve is located.
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Old 10-09-2012, 04:41 PM   #3
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My 2009 - 378 has the 3 valve system and they are extremely hard to access
via the deck plate under the hot water tank compartment.

In the end I replaced the 4 inch deck plate with a 6 inch I obtained
from a marine supply store

Hope this helps

Gary
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Old 10-09-2012, 06:11 PM   #4
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I have the exact same and I have only 1 valve alsow. Works fine so far.
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Old 10-09-2012, 07:17 PM   #5
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When you only have the one valve the antifreeze will still go into the water heater. On the three valve you close the water in and water out and open the bypass to fill your lines with antifreeze without filling your water heater. This will save you from using gallons of antifreeze.
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Old 10-09-2012, 07:38 PM   #6
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I was able to find out that my model has only 1 valve, but there is apparently an automatic valve of some sort somewhere among the water heater connections that is supposed to complete the bypass. However, it's not reliable and is known, to Forest River and to RV techs, to jam and not prevent antifreeze from filling the water heater. I flushed the tank completely, but we'll see if it fills up again when I de-winterize. I think I'll store it down South come next October!
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Old 10-09-2012, 07:42 PM   #7
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Quote:
Originally Posted by PaulK View Post
I was able to find out that my model has only 1 valve, but there is apparently an automatic valve of some sort somewhere among the water heater connections that is supposed to complete the bypass.
In Lou's (Herk's) post #2, 2nd picture, there is a check valve where the top line comes out of the water heater. Water can come out of the tank, but the valve closes if there is no pressure in the tank, or if there is more pressure on the line than in the tank.........or least it is supposed to work that way.
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Old 10-09-2012, 09:17 PM   #8
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My last fifth wheel had the bypass with the check valve. After a number of years the valve got stuck and the antifreeze went through to the water heater. We replaced the valve and that fixed it.
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Old 10-09-2012, 11:16 PM   #9
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That is correct. In the 1 valve and 2 valve systems there is a one way check valve at the water heater outlet fitting. They do jam and so I prefer the 3 valve system. Simple and reliable.
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