Make sure the bottom valve is open and the bypass valve in the middle is closed.
Rv water heater bypass single valve diagram.
The single valve combines the functions of the cold water valve and the bypass valve.
When the by pass system is used it takes the cold water going.
In the last case you have a back check valve on the top water heater outlet and a single tee valve connecting the cold water line and bypass line.
Most rv manufactures today install water heater by pass systems on the rvs they sell.
Rv hot water heater bypass diagram.
Now go into your rv and find the heater from the inside.
It is a series of valves or a single lever valve that allows the water flow to be shut off from the water heater and still be pumped to the rest of the hot water piping.
If your rv has a bypass valve these two pipes will be connected directly to each other using a third pipe.
When the bypass valve is operated cold water is diverted from flowing into the water heater and instead flows.
If there is a middle pipe that connects these two lines congratulations you have just located the rvs bypass valve.
Cold water comes in at the bottom and hot water comes out of the top of the heater.
Make sure the bottom valve is open and the bypass valve in the middle is closed.
You may need to remove a cover to access it.
The water heater by pass system is used to separate the water heater from the rv s plumbing system.
It is a series of valves or a single lever valve that allows the water flow to be shut off from the water heater and still be pumped to the rest of the hot water piping.
Bypassing your water heater allows you to drain the water from it without affecting the rest of the water system.
The by pass system can be used to drain the water heater and to winterize the rv water system.