water heater blanket savings calculations
How your savings are calculated
Step 1 determine heat loss without heater blanket140 hot water temp - 70 ambient air temp = 70 °F difference in water temp and surrounding air 16 water heater R value + 0.6 R value of air film = 16.6 total R value of insulation (37.5 sq ft surface area of water heater x 70 difference in water temp) / 16.6 total R value = 158.1 BTU/hr heat loss |
Step 2 determine heat loss with heater blanket140 hot water temp - 70 ambient air temp = 70 °F difference in water temp and surrounding air 16 water heater R value + 0.6 R value of air film + 6.7 water heater blanker R value = 23.3 total R value of insulation |
Step 3 determine heat loss savings158.1 BTU/hr without blanket - 23.3 BTU/hr with blanket = 134.8 BTU/hr savings with blanket 134.8 BTU/hr / 3,412 BTU/kWh = 0.0395 kW |
Step 4 determine total kWh saved0.0395 kW x 24 hours = 0.948 kWh per day 0.948 kWh per day x 365 days = 346 kWh per year 346 kWh per day x 15 years = 5,190 lifetime kWh |
Step 5 determine money saved0.948 kWh per day x $0.118 per kWh = $0.112 savings per day 346 kWh per year x $0.118 per kWh = $40.83 savings per year 5,190 lifetime kWh x $0.118 per kWh = $612.42 lifetime savings |