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The plumbing connecting an outdoor wood boiler to an in floor radiant heat system for a pole barn, using a mixing valve, plate heat exchanger, pressure tank, circulator pump and and supply/return manifolds. The single pump in the barn (running the two manifolds with 8 loops) is a grundfoss 15-58fc, and the two pumps on the back of the boiler are grundfoss 26-99 (one for the house and one for the barn, each feeding a 40 plate exchanger).
OWB barn loop parts list:
AMT30, Amtrol extrol expansion tank ex-30, 4.4 gallon
CLI551028A, Discal air separator, sweat
CLI521609A, Caleffi thermostatic mixing valve, sweat
HWCPE40WW1, 40 plate heat exchanger, 160K BTU
TACSR-501, TACO 1-zone switching relay for circulators.
Grundfoss 15-58FC circulator pump
The manifold was just a nine zone stainless steel jobber off of amazon.
Thermostat of your choosing, I just used an old air sensing dial type with plans on installing an in-floor sensor (empty pex line in the floor just for this) but the air type has worked well for 3 years now.
I used unions with high temp gaskets for the plate exchanger so if it ever needs cleaning it’s easy to separate from the system. You’ll also need flanges for the circ pump and all the associated pipe and fittings. The pressure tank and air separator are mounted using strut clamp system. The plate exchanger is mounted with a bracket I made out of some sheet aluminum.