water temperature card savings calculations
How your savings are calculated
Step 1 determine heat loss at current temperature37.5 sq ft x (140 hot temp - 70 ambient air temp) / (16 water heater R-value + 0.6 air film R-value) = 158.13 BTU/hr |
Step 2 determine heat loss at new temperature37.5 sq ft x (120 new hot temp - 70 ambient air temp) / (16 water heater R-value + 0.6 air film R-value) = 112.95 BTU/hr |
Step 3 determine heat loss savings158.13 current heat loss - 112.95 new heat loss = 45.18 BTU/hr heat loss savings 45.18 BTU/hr / 85% = 53.15 efficiency-adjusted savings |
Step 4 convert to kW53.15 BTU/hr / 3,412 BTU/kWh = 0.0156 kW |
Step 5 determine energy savings0.0156 kW x 24 hrs/day = 0.3744 daily kWh 0.3744 kWh/day x 365 days/year = 136.656 yearly kWh 136.656 kWh/year x 15 year lifespan = 2049.84 lifetime kWh |
Step 6 determine money savings136.656 yearly kWh x $0.118 = $16.13 yearly savings 2049.84 lifetime kWh x $0.118 = $241.88 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.