Pay in 4 interest-free payments of $38.50 Learn more
Ships within 48 hours · Estimated delivery Oct 25 - Oct 30
This Marley thermostat is fully compatible with manufacturer model series 3UF59 through 3UF63 and specific heater units like the DH1521D
Fabricated from high-grade rubber
but it is specifically optimized for Reznor unit heaters
making them interchangeable for HVAC service calls
McDonnell & Miller 344300 Shield Assembly Els PW 17895 This Marley thermostat is fullyThe McDonnell & Miller 344300 Shield Assembly, recognized as Model SA69 104, is a critical replacement component engineered for the 69 Series Low Water Cut Off (LWCO). Designed specifically for steam boiler applications, this assembly provides a protective surround for the float, safeguarding internal mechanisms against scale buildup and turbulent water conditions that could lead to nuisance tripping. For technicians servicing float type controls,
