The Heat Transfer Products Munchkin R2 (Revision 2) is a discontinued modulating condensing boiler with an efficiency of 95.1% AFUE. The Munchkin R2 boiler replaced HTP’s R1 boiler, and changes in the unit included extra latches on the cover, adjustable feet, a condensation vent on the left side of the unit, and a straight air channel on the burner. It also featured extra wires for better compatibility with HTP’s Vision III boiler management controller, which provides system monitoring and can communicate with one to eight modulating Munchkin boilers. The Munchkin R2 series is a later revision of the HTP Munchkin boiler series.
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