5" WC natural gas to ensure optimal burner efficiency

Excessive soot buildup can bridge the spark gap

This HVAC expansion valve flange facilitates efficient refrigerant metering

Common Questions How do I troubleshoot an HK42FZ020 board with no heat

Lochinvar & A.O. Smith 100187927 Burner Assembly 319847-401 5" WC natural gas toWhen you're servicing a failing GS(N)05040 natural gas water heater, the Lochinvar & A. O. Smith 100187927 Burner is the exact 20 inch final burner assembly required for a drop in replacement. This NAT 20" BURNER ASSY comes pre configured with a #34 orifice, ensuring the correct BTU output and manifold pressure for high efficiency operation in Lochinvar Series 400 units. Veteran techs know that burner degradation or cracked heads often lead to