meaning the necessary thermal or pressure-sensing leads are typically attached or calibrated for this specific PCB

offering a secure termination point that meets code requirements

Key Benefits Precision Control: The modulating valve design provides smooth water flow regulation to prevent thermal overshoot

Key Benefits: Direct OEM Replacement: Drop-in compatibility for HD46AE121

always verify your specific boiler's operating range against the 50 PSI maximum threshold before installation

Lennox 13U52 Heat Exchanger 318973-401 meaning the necessary thermal orThe Lennox 13U52 Heat Exchanger Assembly is a precision engineered 240K BTU aluminum heat exchanger designed for high capacity thermal transfer in demanding light commercial and residential HVAC applications. As a genuine OEM Lennox replacement part, this assembly (part number 613927 09) ensures a perfect physical and pressure drop match for KGA, KGB, LGH, and LGM series units. The corrosion resistant aluminum construction provides superior thermal