I have continued to look into the Manifold idea. Unfortunately, I can't find any that are rated for more than 2.3 gpm out of each line. The Manifold itself is rated for a total of 15 to 18gpm. I am assuming, 2.3gpm to a furnace probably isn't enough. Thoughts?
Second question: The dual loop idea. Is there calculators I can use to determine if my pipe diameter, distance from burner, and devices will pull too much temperature, thus sending the water back to the OWB to cool? The information is 150ft x 1 1/4inch from burner to house, 50ft x 1 1/4inch from wall to furnace (160K BTU Water/Air Exchanger), 10 ft x 1 from furnace to water heater (Brazed Plate Exchanger 5 inch x 12 inch x 20 plate, 97K BTU), 50 ft to wall, then 150ft back to burner.
Lastly- Is there any issue/advantage/disadvantage of going from a 1 1/4 supply and return line, down to the 1 inch for the heat exchange devices? Or is it best to utilize a 1 inch supply and return line to match the equipment?
Thanks!
~Nick