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Old 10-14-2015, 09:15 PM   #1
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Water heater bypass valve

I have a 1996 National Sea Breeze, I want to winterize it myself but I can't locate the bypass valve for the water heater. If there is not a bypass can someone give me a hint on how to winterize my coach? THANKS

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Old 10-14-2015, 09:27 PM   #2
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If you remove the drain plug from the water heater, then open the hot faucet at the kitchen sink, you should drain most all the water from the tank. When the water has stopped draining, you can install a cap like this on your city water female connection. While buying the blow out plug, you could also order a water heater winterizing kit and install it for the future if you can't locate one already installed.


Using an air compressor set at no more than about 40 psi, you can go from faucet to faucet opening the cold until you get air, close it, then open the hot. Do this at each sink, shower, and the toilet, including the sprayer. (if equipped) Don't forget the outside shower. Repeat to see if any water has run back to a low spot and needs a second blow out. Add RV anti-freeze to each trap. If you have an ice maker or washer hook up, blow them out also. After you have blown out all plumbing, open all low point drains and remove or loosen the water heater drain plug.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 10-14-2015, 09:37 PM   #3
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the bypass valve is usually at the back of the w/h on my 5th wheel I have to take a draw out and reach in. if it does not have a bypass there are kits you can buy. without a bypass you could opt to fill the w/h with antifreeze about 6to 10 gal lee
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Old 10-15-2015, 12:32 AM   #4
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Thanks, and thanks for this great site.
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Old 10-15-2015, 08:52 PM   #5
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I have a 1997 National Tropical and my W/H bypass valve is under the fridge. I have to remove a couple of drawers to get to it.

Jim Anderson
1997 Tropical
Jeep Liberty
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Old 10-15-2015, 11:48 PM   #6
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Originally Posted by Gary23 View Post
I have a 1996 National Sea Breeze, I want to winterize it myself but I can't locate the bypass valve for the water heater. If there is not a bypass can someone give me a hint on how to winterize my coach? THANKS
Ask in the National RV Owners Forum.
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No one knows your motor home better then someone owns one like it.
BTW, my bypass valve is in the wet bay left rear of motor home.

1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat 6.0 Diesel Crew Cab DRW, 4X4, B&W Custom Truck Bed, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000, 1994 36ft Avion 5er, GVWR 13,700
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heat, heater, water, water heater

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