This contactor is built to withstand high cycle rates and harsh electrical environments

and 851S make-up water feeders

whereas this is an automatic furnace limit designed for temperature regulation

air dryers

Resideo L4006A2007 Aquastat Controller 322055-301 This contactor is built toFor veteran hydronic technicians and commercial installers, the Resideo L4006A2007 Aquastat Controller provides reliable high or low limit regulation for boilers and storage tanks. This specialized immersion temperature controller is designed for precision, featuring SPST contacts that break on temperature rise to ensure system safety and operational consistency. With an operating temperature range from 100 to 240 degrees Fahrenheit, this unit manages