This relay is commonly used in York residential air handlers and heat pumps

Universal Power Flame Compatibility: Explicitly designed as a direct replacement component for Power Flame series burners

but it is primarily used in a normally closed configuration

Can I use a universal adjustable switch instead

Direct drop-in compatibility for Bunn 22300

Weil McLain 510-312-152 Control 30067439-890 This relay is commonly usedThe Weil McLain 510 312 152 Tankless Heater Low Limit Control is a critical safety and operational component designed for CGT model boilers. As a veteran grade aquastat controller, this unit features a fixed 8 degree differential and includes the necessary immersion well for direct sensing. Its primary function is to maintain minimum boiler water temperature, ensuring the tankless heater can meet domestic hot water demands without dropping below