This air gap is optimized for 3/4" and 1" Watts Series 009/909

Standard 24V Operation: Compatible with most 40VA transformers and 24VAC control systems for straightforward electrical integration

The operator functions by sensing ambient air temperature to regulate the flow of the heating medium through the valve

the HC43AE234 offers a direct-fit solution that eliminates field modification guesswork and restores system head pressure to nominal levels

Laars Heating Systems R0407700 Gas Valve 322027-701 This air gap is optimizedAs a seasoned technician, you know that maintaining precise combustion control is non negotiable for high efficiency hydronic systems. The Laars Heating Systems R0407700 Gas Valve is a critical 2 Stage Natural Gas Valve engineered for specific boiler configurations, including the Laars Mini Therm and Mighty Therm series. Built for negative regulation, this direct replacement gas valve ensures the correct air to gas ratio across both firing stages,