For the 143 series

this bimetal disc thermostat ensures the system remains protected without requiring manual intervention after cooling

providing the necessary resilience to withstand the thermal cycling and chemical exposure typical of condensing boiler components

Combustion Optimization: Helps prevent common issues like "lazy flames" or excessive carbon monoxide production by maintaining the correct gas velocity

it ensures seamless integration with Berko and Marley Engineered Products equipment

Heil Quaker ICP 1320381 Limit Switch For the 143 seriesThe Heil Quaker ICP 1320381 Limit Switch is a critical OEM replacement part engineered for high limit thermal protection in residential heating systems. Designed as an auto reset limit switch, this component monitors internal heat exchanger temperatures, maintaining a precise operating range of 146? F to 150? F. When temperatures exceed the L150 40 threshold, the switch breaks the circuit to prevent equipment damage and ensure safe operation. This