Joint Appendix JA16 provides the eligibility criteria for energy efficiency measures for solar pool heating systems, sizing for heat pump pool heaters (HPPH), and on-site renewable energy or recovery energy.

Solar pool heating systems shall be certified and rated by the Solar Rating and Certification Corporation (ICC-SRCC), the International Association of Plumbing and Mechanical Officials, Research and Testing (IAPMO R&T), or by a listing agency that is approved by the Executive Director.

Solar thermal collectors shall be listed and labeled in accordance with Table 110.4-A. The installed system shall meet the following eligibility criteria:

The system shall be installed according to manufacturer’s instructions.

The system shall be installed in the exact configuration for which it was rated. The system shall have the same collector(s), piping, pump, vacuum relief valve, controls, and other components used to establish the rated condition.

A heat pump pool heater (HPPH) shall be sized using the HPPH manufacturer’s specifications. The following sizing provisions shall be applicable if the HPPH manufacturer’s specifications do not include information on HPPH sizing:

Determine desired pool temperature in °F.

Determine average temperature for the coldest month of pool use in °F.

Determine temperature rise in °F by subtracting the average temperature for the coldest month from the desired pool temperature.

Calculate the pool volume in gallons.

Calculate the time needed for the HPPH to achieve the 10 °F degree rise in hours. This shall not exceed 17.5 hours.

Use Equation JA16-1 to determine the Btu/h output requirement of the HPPH.

Where:

Qout is the output heating capacity of the HPPH

Vp is the pool volume in gallons

8.33 is the weight of a gallon of water at 62°F in pounds per gallon

ΔT is the pool temperature rise in °F, and shall not exceed 10°F

t is the time needed for the HPPH to achieve the 10 °F degree rise in hours and shall not exceed 17.5 hours

The mechanical engineer shall provide documentation that a on-site renewable source and/or on-site recovery source provides at least 60 percent of the calculated annual energy consumption of the pool and/or spa heater. The documentation shall be submitted together with the Certificate of Installation for the pool and/or spa heater.