The Resideo L4080B1352 Immersion Type Aquastat Controller is intended for accurate temperature control in hydronic heating systems. This surface-mounted controller attaches via the case's base and provides precise temperature control between 100°F and 200°F. It is ideal for use in boilers, water heaters, and other HVAC equipment that requires dependable temperature management. https://www.partshnc.com/l4080b1352-resideo-100200f-1-12-3-insul-8fdif