I've been trying to RTFM when it comes to the subject of automated propane but I'm confused because the threads out there seem to be scattered with various people chiming in on various things and not knowing much about gas I am lost.
Although its nice, it seems the most expensive part of the system is actually the safety valve and spark system. I'm wondering if that is necessary if one would just watch it?
the 12v output from the PID is the signal that goes to and controls the SSR which is just a fancy electronic switch. You also need a 12 volt source to operate the solenoid. The 12 volt source going to your solenoid valve will be switched on and off by the SSR which is controlled by the PID therefore controlling temperature.

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