The Honeywell Home T874J1010 HydroHeat Thermostat is a hydronic (hot-water) heating thermostat designed to control boiler temperature in residential heating systems. It regulates the boiler water temperature to maintain steady comfort and improve energy efficiency in hydro-heat installations. Identified as model T874J1010 within Honeywell Home's HydroHeat family, this unit serves as a dedicated control for hydronic heating applications.
