which offer superior thermal resistance compared to standard HVAC actuators

the "H" designation typically refers to specific packaging or internal manufacturer codes but does not affect technical performance or installation

the CTRD-101 allows for a clean "drop-in" rebuild of the feeder valve

and Sears furnace models

Lochinvar & A.O. Smith 100163258 Bypass Assembly 30067439-890 which offer superior thermal resistanceThe Lochinvar & A. O. Smith 100163258 Bypass Assembly is a critical OEM component engineered for precision flow regulation in high performance hydronic systems. Designed specifically for EnergyRite Residential Pool Heaters (models ERN ERL 152 through 402, Non ASME), this bypass valve kit ensures optimal heat exchanger protection by maintaining the correct balance between bypass and through flow water. As a direct replacement for the obsolete Lochinvar