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Will a Tankless water heater work for Radiant Floor system? Are they reliable and will they last? This video explains my experience with a Tankless Water Heater heating a 3200 sq ft building with 12 ft sidewalls , 4700 ft of 1/2" pex in the COLD Minnesota weather. Find out if it will work!!
My heater is a Takagi T-H3M 120,000 BTU Condensing Modulating Tankless Water Heater. I overpaid for a rebranded one by 40% so hopefully this will let you not make the same mistake I did! I am no way compensated by Takagi for this, it is my experience so far with this heater.
Pole Barn Garage/Shop is 3200 Sq Ft with 12' interior height. I have it set at 57 degrees inside for both zones. Zone 1 has about 3500 ft of 1/2" Pex. Zone 2 has about 1200 ft of 1/2 Pex. Running 1/2 GPM in most loops ( Loops by wall run .75 GPM as more heat loss)