Based on this product's specifications, here are some alternatives and similar models
Boiler Controller TECH ST-37nRSH for Piston Feeder, black
Summary description:
Boiler controller TECH ST-37nRSH designed for use with piston (plunger) fuel feeders. Provides control and regulation of boiler operation and feeder timing, enabling automated fuel supply and combustion management. Suited for residential and small commercial solid-fuel boiler systems requiring integration with piston-type feed mechanisms; facilitates reliable start/stop sequencing and basic safety interlocks.