Solar Hot Water System Calculator
Use the FEMP solar hot water calculator to estimate what size of solar system will work best for your Federal facility and how much it will cost.
The Energy Independence and Security Act (EISA) of 2007 Section 523 requires new Federal buildings and major renovations to meet 30% of hot water demand using solar hot water equipment if it is life-cycle cost effective. This tool can help meet that goal.
Follow the steps below to calculate approximate solar hot water system size and cost needed to meet the Energy Independence and Security Act (EISA) of 2007 Section 523 solar hot water requirement for new Federal construction and major renovations.
Based on the data provided, the results for your facility includes the following. Note that these outputs do not include available incentives or rebates.
|Amount of Water Usage|
|Number of person(s)|
|Cold Water Temperature||(°F)(Tcold)|
|How Water Temperature||(°F)(Thot)|
|Water Heater Fuel Type|
|Water Heater Efficiency|
|Average Fuel Price|
|Annual Energy Savings||kWh/year|
|Annual Cost Savings||$
based on $/$
|Annual Greenhouse Gas Reduction||lbs. of CO2|