Hi all, I need to purchase a flat plate heat exchanger to heat my shop. The shop is 150' from the house and the plate will be in the house by the boiler. The shop has a heat load of less than 25,00 btu, and the primary load will be the infloor tubing. I also installed a 40,000 btu high temp unit heater. I understand it will be easy to supply the infloor , but how big of a plate do I need to transfer enough heat to supply the high temp unit. The shop side of the loop will be glycol filled and all underground piping and interior piping in 1-1/4"? So all of that said how big of a plate do I need and where do I buy it from? Preferably 1-1/4 inch ports?