Shelly 1PM Gen4 vs Shelly 2PM Gen4

The Shelly 1PM Gen4 wins on value and keeps confirmed dry and wet contact modes, making it the pick for a single monitored circuit. The Shelly 2PM Gen4 is the better buy only if you need a second channel, roller-shutter cover mode or its fuller safety-protection suite.

Channel count and role. The 2PM Gen4 controls two circuits and adds interlock/cover mode for shutters and a four-way safety suite, while the 1PM Gen4 is a single-channel module. Both share 16A, energy monitoring and the same multi-protocol radios.

Yes. Both the Shelly 1PM Gen4 and Shelly 2PM Gen4 have built-in power metering, support Matter, act as a Zigbee router, and work with Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant. The 2PM simply meters two channels instead of one.

Buy the Shelly 1PM Gen4 if you want to monitor and control one circuit, such as a water heater or boiler, at a lower price, and you value its confirmed dry and wet contact modes for flexible wiring.

Buy the Shelly 2PM Gen4 if you need to control two circuits, automate roller shutters or blinds with cover mode, or want its complete four-way safety protection. It is the choice for dual-circuit and shutter setups.