Grand Design Reflection Fifth Wheel 150 Series Owner's Manual page 150

Propane System
144
Calculating Propane Use
Your Reflection Fifth Wheel's furnace, refrigerator, water heater
and range (if applicable) may all use propane to operate. Use
the BTU rating of each appliance to determine how long your
propane supply will last. Propane consumption depends on
their individual use and the length of time operated.
Most RV gas appliances are operated intermittently. Unless
there is heavy use of hot water, the water heater consumption
of propane is minimal. During cool temperature or high wind
conditions, furnace consumption can be extremely high.
To calculate your propane supply, take the BTU ratings for your
propane appliances and divide that into the BTU availability.
Each gallon of propane (3.86 liters) produces about 91,500
BTUs (46,514 kilojoules) of heat energy.
Average Propane Consumption
Appliance
Water Heater
Refrigerator
Furnace
Range w/ Oven
Range - Rear Burner
Range - Front Burner
Average BTU
Consumption/Hr.
8,800
640-1,200
16,000 - 35,000
7,100
6,500
9,000
Kilojoules/Hr.
9,284
675-1,266
16,881 - 36,927
7,491
6,857
9,496