Remind us how many ft2 the floor will be? When we design these for boilers we are using trying to get a 20F dT and this usually meant we needed about 250' of 1/2' tube per loop. Head loss is quite reasonable and I recently did an 8 loop floor with a Alpha pump and the display goes back and forth from about 3gpm to a power consumption, when it settled somewhat down, of 12-15w. It is hard to get much better as this was the whole house.
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