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I would think the GPM is okay returning to the water heater? No way to tell really the flow meters are positioned on manifold where water enters the floor loops

Not the least bit embarrassed, travelling for work. Flow rates and temper differentials are all within spec as well as the loop sizing and length....I had the loop size and spacing engineered by supplier for this building with heat loss calcs. Water heater is capable of 30,000BTU and system...

So I had this system installed in my new shop last year and something seems like it is just not quite right. My shop is 26x32 10' ceilings with steel exterior 3" spray foam in the walls and 3/8" dairy plastic For the interior finish. 5" concrete floor with foundation that has 2" rigid insulation...