A5.207.3 Service Water-Heating Systems and Equipment
Equipment shall meet the applicable requirements of the Appliance Efficiency Regulations as required by Section A5.210.1, subject to the following:
- If more than one standard is listed in the Appliance Efficiency Regulations, the equipment shall meet all the standards listed; and
- If more than one test method is listed in the Appliance Efficiency Regulations, the equipment shall comply with the applicable standard when tested with each test method; and
- Where equipment can serve more than one function, such as both heating and cooling or both space heating and water heating, it shall comply with all the requirements applicable to each function; and
- Where a requirement is for equipment rated at its "maximum rated capacity" or "minimum rated capacity," the capacity shall be as provided for and allowed by the controls, during steady-state operation.
Unfired service water heater storage tanks and backup tanks for solar water-heating systems shall have:
- External insulation with an installed R-value of at least R-12; or
- Internal and external insulation with a combined R-value of at least R-16; or
- The heat loss of the tank surface based on an 80°F water-air temperature difference shall be less than 6.5 Btu per hour per square foot.
Any newly constructed building constructed by the State shall derive its service water heating from a system that provides at least 60 percent of the energy needed for service water heating from site solar energy or recovered energy.
Exception: Buildings for which the state architect determines that service water heating from site solar energy or recovered energy is economically or physically infeasible.