it is compatible with both hydronic and forced air systems and functions as a direct 668-430 replacement and Beckett 7505P1515 alternative

It slide-fits into the gauge assembly

While specific kits vary

Always verify the part number against the equipment's schematic to ensure proper HVAC part compatibility

Reznor 201635 Heat Exchanger 30067439-890 it is compatible with bothThe Reznor 201635 Heat Exchanger is an essential OEM replacement component engineered for high performance UDAP gas fired unit heaters and UDAS separated combustion unit heaters. Specifically designed for 175,000 to 200,000 BTU models, including APD, UDBP, and UDBS series, this assembly ensures critical heat transfer efficiency in demanding commercial and industrial environments. Constructed from heavy duty aluminized steel, the Reznor 201635 provides