Solar home water heater performance requirements

Update Time:2018/8/9

Solar water heating systems must be safe, reliable, require no operator intervention for normal operation, be visually unobtrusive, and be designed and installed in accordance with all applicable codes.  Design and size the system so that solar energy supplies approximately the percent of the annualized hot water demand (“Required Solar Fraction”) specified in Table 1, below.  


Table 1:  Percent of annualized hot water demand to be met by solar hot water heating system in each location covered in this solicitation:



Required Solar Fraction

Gallons per Day Demand

Hot Water Delivery Temperature

Avg. Main Water Temperature (F)