Nordyne 903479 Heat Exchanger 30067439-890 the lower thermostat controls the

the lower thermostat controls the bottom element to maintain the overall tank temperature after the upper thermostat has satisfied the initial demand

preventing nuisance boiler shutdowns during normal operation

high-amperage draw motors

Housed in a durable glass-filled nylon body

Nordyne 903479 Heat Exchanger 30067439-890 the lower thermostat controls theThe Nordyne 903479 Heat Exchanger is an OEM primary heat exchanger assembly engineered for high efficiency gas furnaces and packaged systems. Constructed from rugged aluminized and stainless steel components, this assembly is designed to handle the thermal stress of recurring combustion cycles while maintaining critical airflow integrity. As a veteran grade replacement part, it serves as the core thermal transfer component, preventing combustion gases