Jim,
Don't discount your dealer knowing this information. Give them a call. Also, don't let not being able to bypass the heater from letting you go camping with it. It will be fine.
A couple minutes of sleuthing may help you locate the bypass. Find the water heater first. From the outside, there is usually a square access panel that is removable. Behind this panel is the water heater. Behind the water heater is usually the bypass valve. Transfer this exterior location to the inside and start looking there.
Jim