Case Studies

Case study describing the retrofit of a hybrid gas water heater that combines a reduced capacity tankless unit with a downsized storage tank.

Case study describing benefits of and steps involved with insulating a hot water heater.

Study demonstrating the performance of multiple CO 2 heat pump water heaters utilized in a “swing tank” CHPWH system design in a 60-unit low-rise multifamily building in the Pacific Northwest.

Study focusing on the installation of a new commercial heat pump water heating system installed as a retrofit in a 100-unit, low-income senior housing building in Seattle, WA.

Case study describing a DOE Zero Energy Ready Home 2013 Housing Innovation Award Winner in Seattle, WA, that scored HERS 34 without PV.

Study focusing on the installation of a custom engineered CHPWH system in the parking garage of an apartment building in Seattle, WA.

Case study describing an effort to research, design, verify, and document a heat pump water heating system for a multifamily building using the building sewage as the heat pump’s heat source.

Case study describing how combination space and water heating systems can be used in homes with efficient thermal enclosures, decreasing energy consumption and costs.