Minime, that's a full cord, not a face cord. Could get it for $135 elsewhere but the guy who quoted $150 customs saws cabinet grade lumber for me. He's poor and we have a good working relationship. I don't mind.
VB, why the pump and check valve in the bypass? about the dumb boiler...It'll be slightly oversized for the house in case of a future addition.
Myles, the reason for having them in series is that the main circulation pump is part of the propane boiler. It has a single pump and two zone valves. Doubling up on the rest of the hardware will be a much bigger job, but if there's a compelling reason I'd like to hear it. The old oil boiler had 2 separate pumps. They're in the upstairs of the garage.
BW and Manu, just checked the prices and wood pellets are awfully tempting. Slightly more $ but much less hassle with an auto-feeder. Same with coal. Will look into those options. Thanks men.
Airhill, that's a valid concern but both boilers have/ will have pressure relief valves from the factory. If something goes wrong they will dump the water on the floor. It's covered.
Local place has the Harman SF-260
. for around $3600. Might do that for wood or coal.