The Resideo L4006A1017 Aquastat Controller is a rugged, immersion-type temperature control device ideal for regulating liquid temperatures in boilers, storage tanks, and similar systems. It features a wide operating range of 100 °F to 240 °F with a 5 °F to 30 °F adjustable differential, giving you precise control over how the system responds to temperature changes. The controller uses... https://www.partshnc.com/l4006a1017-resideo-aquastat100240f-5-30fdifwwel