140 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 blanket
140 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 savings
158.1 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 saved
0.0395 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 saved
0.948 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
Savings calculations are presented as an example of potential savings; actual savings may vary based on use, utility rates and other factors.
Calculations are based on national averages and assumptions and may be adjusted for a more accurate estimate of individual savings.
While EnergyEarth strives to provide the most accurate information, we cannot guarantee the savings displayed.
