{15 Government Federal law prohibits removal of this label adore consumer purchase. ENERGY GUIDE Portable Water Heater . Natural Gas Compote Systems LLC «80,000 BTU Model ZING ~300PM Estimated Yearly Energy Cost $206 Ee $191 Cost Range of Similar Models Maximum Gallons Per Minute of Hot Water (GPM Rating) medium « Your cast will depend on your utility rates and use. » Col range based only on models fused by natural ges with a 3.0 GPM faring.