By using genuine unit heater conversion components

and seat O-rings for a full rebuild

A clear carryover tube prevents unburned gas accumulation by ensuring that as soon as the first burner ignites

it maintains accurate volume control between adjustable minimum and maximum setpoints in response to a thermostat or master controller signal

While it can be mounted in any position

Robertshaw 700-434 Gas Valve 30067439-890 By using genuine unit heaterThe Robertshaw 700 434 Gas Valve is an industry standard 24V standing pilot gas valve designed for high performance heating applications. This 1 2" x 1 2" slow opening gas valve is engineered to provide soft, controlled ignition, significantly reducing burner noise and mechanical stress during startup. With a 100,000 BTU capacity and standard 3. 5" W. C. natural gas factory setting, it serves as a robust solution for central heating units, commercial