How much water would you use for an average shower in your RV? I see some water heaters are 6 gallon, some 10 some 12, etc. Als,o what is the water heater bypass I see on some campers, and what is it for? I assume it is a valve arrangement.
If you take a Navy shower, you can get by on 2 gal. or less. We have a 10 gal. water heater and have never run out of hot water.
The bypass does just what it sounds like, bypasses the fresh water inlet directly to the outlet, so you can drain the water heater without draining all the water lines. It may be a single valve or two separate valves.