Interactive Energy Calculators

Interactive Energy Calculators

Our calculators help you understand energy production and consumption in a whole new way. Use them to develop a personal profile of your own energy use.

Carbon Pollution Calculator
Electric Power Pollution Calculator
PV System Economics
Solar Water Heating
What's a Watt?

Solar Water Heating Calculator

Water heating is a major energy consumer. Although the energy consumed daily is often less than for air conditioning or heating, it is required year round, making it a good application of solar energy. Use this calculator to explore the energy usage of your water heater, and to estimate whether a solar water heater could save you money.

Water Heater Characteristics
Physical		Thermal
Diameter (feet)		Water Inlet Temperature (Degrees F)
Capacity (gallons)		Ambient Temperature (Degrees F)
Surface Area (calculated - sq ft)		Hot Water Temperature (Degrees F)
Effective R-value		Hot Water Usage (Gallons per Day)
Energy Use
		Heat Delivered in Hot Water (BTU/hr)
		Heat loss through insulation (BTU/hr)

Gas vs. Electric Water Heating
Gas		Electric
	Overall Efficiency
	Conversion Efficiency	0.98
BTU/hr	Power Into Water Heater	BTU/hr
Cost
$/Therm	Utility Rates	$/kWh
$	Yearly Water Heating Cost	$
How Does Solar Compare?
Solar Water Heater Cost: $		Percentage Solar:
years for gas	Payback Time for Solar System	years for electric

More information on solar water heating:

Fact sheet - Solar Water Heaters
Fact sheet - Solar Water Heaters for Swimming Pools
Kids fact sheet - Heat from the Sun

Return to Top of Page

Send comments, questions, and suggestions to website manager.

Window on State Government | Privacy and Security Policy | Accessibility Policy

State Energy Conservation Office (SECO)