That looks real clean!
Is it solder or propress?
Oh yay! another oil appliance with a barometric damper.
All propress, the extra cost of fittings is nothing compared to the time we save. We are pro-pressing everything we do now, even most of our gas piping.
Besides that, pretty straight up MPO, we love the IQ series, with the outdoor reset option card the fuel savings are unreal. They sell themselves.
We also put barometric dampers on most of our equipment. Seems to be the normal here in Connecticut. Helps for overdraft conditions.