Quote Originally Posted by Rambozo View Post
True, but you have to be careful of how the argon solenoid is switched. If it's switched by a relay you can probably see the contact rating on it and make sure that you don't exceed that with two solenoids. But if it's solid state switching, it might not have that much extra current available, in which case you might need to add a relay to switch one or both solenoids. The last thing you want to do is fry the solid state device that switches the solenoid. Some solenoid valves can draw a fair amount of current.
I could, but why? Seems to me I'd want it running before and longer than the gas, to draw remaining heat from the head and circulate the water for best heat transfer.