Should be firing up the econo-150 this Sunday/Monday for the first time. It's long over due and not being a plumber/pipe fitter by trade,it's been an interesting project. I have to drain my oil boiler to modify my pex connections. I'm figuring while the oil boiler is cold, that would be the time to bring the Econo online? That way I would avoid any cold shock to the oil boiler? Any other advice/tips or suggestions when I fire up the econo?