The Honeywell Resideo L4006A1827/B is an aquastat that has a 100 to 240°F (38 to 116°C) temperature range.  It features a large control point scale with an external adjustment screw allowing easy temperature setting.  UL-recognized, AGA, and CSA-certified.

The aquastat controller is designed to regulate and limit the high or low temperatures of liquids found in boilers, storage tanks, and various other applications. This unit is built with an enclosed micro snap-acting switch that activates based on temperature increase towards the set point.

The L4006A1827/B can be installed and mounted horizontally. The remote bulb can also be utilized for sensing air temperature in ducts and outdoor environments.  The 107408 heat conductive compound and Q615A1004 splash-proof enclosure accessories are also available.