A heat pump water heater (HPWH), uses electricity not to generate heat directly but to transfer heat from one place to another. This makes it the most energy-efficient type of water heater on the market.

Due to their high energy efficiency, heat pump water heaters have a carbon footprint 50% lower than conventional electric tanks and 66% lower than natural gas tanks. Because of their efficiency, they can often reduce utility bills, particularly if replacing electric resistance water heaters.

Mountain West primarily installs AO Smith and LG Heat Pump Water Heaters.