Control You Can Count OnThese immersion-type controllers from Resideo combine high limit protection with low limit and circulator control in forced hydronic heating systems, including domestic hot water service. The controllers provide multizone control by using a separate circulator and relay for each zone. Mount it directly to boiler.

• Immersion-type controllers that combine high limit protection with low limit and circulator control in forced hydronic heating systemsProvide multi-zone control by using a separate circulator and R845 relay for each zoneInclude diaphragm powerhead and micro switch assembly that respond to temperature changes in boiler waterMount directly to boilerSelect models include large transformers and extra terminals for supplying power to low voltage zone valvesRequire 24 VAC thermostat with heat anticipator set at 0.2 A (plus current draw of gas valve on L8124E)