and specific series of Lochinvar Copper-Fin boilers

this is an OEM part for the Nordyne family of brands

Stable Performance: Utilizes a 10K ohm Type II thermistor to deliver precise temperature data back to the controller

Precision Regulation: Factory-calibrated 3

this specific part is designed for the single pin or clipless configuration

McDonnell & Miller 53-HD Control 30067439-890 and specific series of LochinvarUpgrade or restore your boiler's mechanical water feeder with the McDonnell & Miller 53 HD Head Mechanism. Designed specifically for low pressure steam and hot water boilers, this heavy duty Series 53 replacement part (Part Number 137000) provides proportional feed action to maintain safe water levels in systems larger than 5,000 sq. ft. As a head mechanism only, this unit allows for a direct swap onto your existing float chamber without needing to