Resideo L4006E1117 Aquastat Controller 321702-401 Professional-grade climate control begins with

Professional-grade climate control begins with the Peco Controls TB155-048

it offers the exact calibration required for the closed-loop safety circuits found in modern gas heating systems

allowing for versatile tuning across various heating and cooling stages

sensitive diaphragm that maintains accuracy even at extremely low pressures

Resideo L4006E1117 Aquastat Controller 321702-401 Professional-grade climate control begins withThe Resideo L4006E1117 Aquastat Controller is a professional grade high limit manual reset immersion device engineered for precision liquid temperature regulation in hydronic systems, boilers, and storage tanks. Featuring an SPST switch that reliably breaks the circuit on temperature rise, this controller is a critical safety component to prevent equipment overheating. The unit is equipped with a 3 8" x 2 7 8" copper bulb and a 1 1 2" capillary,