The Northwest Energy Efficiency Alliance (NEEA) contracted with Ecotope, Inc. and Cascade Engineering Services, Inc. to conduct a laboratory assessment of the Sanden model # GES- 15QTA heat pump water heater (HPWH) for northern climate installations. The testing plan included observing heat pump efficiency atlower ambient temperatures (30° F, 50° F, and 67° F); conducting the standard 24-hour and 1-hour rating tests; measuring noise output levels; quantifying the number of efficient showersdelivered at 50° F ambient; and measuring airflow across the evaporator coil under different ducting regimes. Overall, the results suggest the GES is an extremely efficient heat pump water heater and suitable for nearly all applications in the Pacific Northwest.
