Here's Rick's first solo boiler install without a senior tech doing it. He & I engineered the swap. We even ignored the instructions and did it Dan Holohan's way of pumping away. The manual showed the pump on the return like the good old days. Purger & vent at the highest point, tank under it, fill at that point, then the pump. Would have been nice to change the manual valves on each loop but salesman didn't call for it and would have freaked if we had done it eating up his commission. Purged easily and was heating nicely.