10-01-2015, 03:22 AM
mine are pressure activated, flow rate and pressure related however.....
there is a pressure microswitch that activates the gas solenoid, downstream once it senses the required pressure.
the gas valve proportions the gas / water ratio to regulate temperature controlled by the temperature knob - limited to about a 45 degree rise
there is also a overheat switch that keeps the unit from scalding its user, should the flow rate drop below the ability of the gas valve to regulate temperature rise
there is a pressure microswitch that activates the gas solenoid, downstream once it senses the required pressure.
the gas valve proportions the gas / water ratio to regulate temperature controlled by the temperature knob - limited to about a 45 degree rise
there is also a overheat switch that keeps the unit from scalding its user, should the flow rate drop below the ability of the gas valve to regulate temperature rise