The RTF deactivated this measure because of field reports of the heat pump water heaters operating inefficiently. While there were not a lot of example installations, of those that the RTF knew about, most were operating in electric resistance mode for various reasons. Once issues with the technology have been satisfactorily sorted out, and if there remains regional interest, the RTF could eventually revisit the concept of having a commercial integrated HPWH UES measure. For more background on the deactivation of this measure, please refer to the February 2025 HPWH subcommittee meeting materials and the March 2025 RTF meeting materials. The following is an archive of the deactivated measure
Archived text:
This measure requires installing an ENERGY STAR-certified HPWH with an integrated tank to serve a commercial space. It applies to both existing buildings and new construction, provided a HPWH is not mandated by local code. In addition to efficiency requirements, the ENERGY STAR specification is restricted to units with rated maximum power draw of at least 12 kW and tank volume of at most 140 gallons.
The RTF has separate UES measures for residential water heaters in commercial applications and for unitary commercial water heaters with plans to develop a measure for larger commercial split/built-up systems in the future. In all cases, there is savings uncertainty due to variations in water heater technology, water usage patterns, distribution losses, and other factors.
