DIN-rail ESPHome OpenTherm gateway connecting OpenTherm-compatible boilers to Home Assistant. Provides full bi-directional control of setpoint, modulation level, DHW temperature, hot water demand and reads boiler diagnostics (flame, fault codes, return temp, modulation). Ships with ESPHome pre-installed. Integrates with Home Assistant climate entity for smart heating control with hybrid sources like wood fireplaces, solar collectors, and gas boilers.

Wall-mounted OpenTherm thermostat for Home Assistant. It controls the boiler over OpenTherm: the schedule and weather curve run on the thermostat; boiler pressure, faults and hot water are shown on a 2.8-inch colour screen. Built-in temperature, humidity and light sensors, 24 GHz presence radar. ESPHome pre-installed, no cloud. Powered from 24 V DC.