Rinnai P70EV-KITE 32e/HD70e Gas Control Valve - Genuine Heater Spare The gas control valve in Rinnai Infinity 32e and HD70E - its one of those parts that gets a lot of people scratching their heads. Its not even a simple on/off switch, its an electronic brain that keeps a constant eye on the gas flow to the burner and makes adjustments every time it fires up. In normal running, the PCB keeps the main solenoid valve wide open while there is a flow through the unit and the burner needs to be lit. And its a very clever system - it uses the modulating valve and three changeover solenoid valves to keep the outlet water temperature rock steady - no matter if the flow rate or water temperature changes. Thats right - it can take all those variables into account - and still get the temperature spot on. The modulating valve works by directing gas to th