First time motorhome buyer where is the water heater bypass?

Vulcan Rider wrote:

Fifty4F100 wrote:

The bypass is in place if you wish to put antifreeze in your entire system. If you don't have or use the bypass you are using at least an extra 6 gallons of antifreeze. Not needed.

Maybe I'm missing something here but while you are pumping the pink stuff IN, if you are careful to NOT open any of the HOT faucets, at least not for very long......would that not prevent much of anything from going into the heater ??

Then drain it after everything else is charged with pink ??

At least with my coach, there's a good chance if there is a droop in the hot water line between the tank and a faucet, or the tank and the inlet outside, a hard freeze will burst the line. That's why we need to at least blow the lines out with 40 psi of air. My owners manual says it needs at least 10 gallons of antifreeze to entirely fill the lines in the system. That's got to include the hot water tank, but I have the one gate valve at the inlet and did have the check valve at the outlet side to keep antifreeze from backing into the tank. I was going to put another gate valve at the outlet last year when the check valve froze shut. Couldn't find one to fit at Lowe's. After putting it all back together, I found a box of valves on the counter at a local RV parts store. Must be an item that tends to fail over the winter season.

On a related note, a plumber friend of mine says the pex lines we have can freeze about 4 times before it has a chance to burst. Has anyone else heard that?