Key Benefits for the Contractor: OEM Compatibility: Exact fit for Lochinvar Knight KHN and WH series models

this is a 1-pole unit with a shunt

Simplified Installation: Standardized dimensions allow for quick swap-outs during emergency service calls

The HVAC auxiliary switch provides a secondary set of contacts that change state with the main poles

Laars Heating Systems RXD7198 Control Board 320734-701 Key Benefits for the Contractor:The Laars Heating Systems RXD7198 Control Board is a critical OEM replacement part engineered for precise thermal management and system logic within high efficiency hydronic systems. Specifically designed for the Laars NeoTherm NTH150 210 series, this HVAC control board integrates advanced microprocessor logic to regulate combustion air flow, ignition sequences, and variable firing rates. For contractors performing boiler control board replacement,