Your Aqua-Hot will use about 1/2 gallon of diesel fuel per hour when the diesel burner is running. You will have noted that the diesel burner does not run all of the time.
Coach owners report usage in the 1-2 gallon per day range. This of course depends on how cold it is outside and how warm you want it inside.
Manuals for your unit are available on the Aqua-Hot website. If you post which model number you have, I can direct you to which manual to use.
- Roger Berke -