Solar Energy Solutions

Make Your Home a Solar House with Solar Panels and Solar Hot Water Heaters.

Water Heating Spreadsheet

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 spreadsheet 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 (BTUH)

Heat loss through insulation (BTUH)

Gas

Electric

Overall Efficiency

Conversion Efficiency

0.98

BTUH

Power Into Water Heater

BTUH

Cost
$

/Therm

Utility Rates $

/KwH

$

Yearly Water Heating Cost

$

Solar?

Solar Water Heater Cost: $

Percentage Solar:

years

Payback Time for Solar System

years


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