Honeywell L4006A1009 Aquastat Controller

Honeywell L4006A1009 Aquastat Controller — a temperature control device from Honeywell designed for use in hydronic heating systems. Model L4006A1009 is commonly used to monitor and regulate boiler water temperature and can serve as a direct replacement in compatible boiler and heating equipment. Its compact form factor makes it suitable for both residential and light commercial installations where reliable temperature control is required.