Resideo - Honeywell Home L4006B1155 Aquastat Controller

Aquastat Controller by Resideo - Honeywell Home L4006B1155 delivers reliable boiler control for residential systems. Designed for direct horizontal or vertical immersion wells, it uses a copper sensing bulb and a 3-inch capillary to monitor temperatures from 100 to 240°F, with a maximum rating of 150°F. Ideal for boiler and storage-tank applications.

Built for durability and safety, this unit features SPST contacts with break-on-temperature-rise and robust load ratings. It supports 8 A at 120V AC / 5.1 A at 240V AC (full load) and 48 A / 30.6 A (locked rotor), plus 0.25 A at 0.25–12 V DC. Connections include a 3/4 inch conduit and screw terminals; UL-listed, CSA and AGA approved.

The sensing bulb is filled with toluene or silicone oil. The differential is adjustable from 5–30°F. Dimensions measure 2" W x 2-1/8" D x 5-5/8" H, with pressure ratings of 200 psi on the capillary bulb and 255 psi in the immersion well. Includes factory stop at 240°F and a heat-conductive compound.

• Immersion options: Direct horizontal/vertical well for boiler and storage-tank systems.
• Sensing assembly: Copper bulb (3/8" Ø x 2-7/8" L) with 3" capillary; oil-filled.
• Temperature control: Adjustable differential 5–30°F; range 100–240°F; max 150°F.
• Electrical and connections: SPST contact; screw terminals; 3/4" conduit; UL-listed, CSA, AGA approved.