The Wt8840 Series Is The Water Heater Control For Trade Use To Replace Wv8840 Valves Used In Aosmith And Bradford White Water Heaters. It Is Designed For Use In Standing Pilot Applications Using An Immersion Well For Water Temperature Sensing. An Included Integrated Ntc Temperature Sensor Reads Water Temperature Within The Appliance Up To 221 F (105 C). Made in United States. Manufactured by Honeywell.