120 V (plug-in) heat pump water heater
A 120 V heat pump water heater plugs into a standard household outlet — often a shared 15 A circuit — so it can replace a gas water heater without new wiring or panel work. The trade-off is slower recovery and usually no resistance backup.
Conventional HPWHs need a dedicated 240 V circuit, which can add significant electrician cost to a retrofit. 120 V models were designed specifically to remove that barrier for gas-to-electric swaps: plug in, connect water, done.
Because a 15 A/120 V circuit caps input power, these units rely almost entirely on the heat pump and use larger tanks or mixing valves to stretch capacity. They suit steady, moderate use better than surge-heavy households.