Quote:
Originally Posted by DonT
that's what I do now but when the temp drop's from 25° during the day to 5° at night the water temp I have set does not keep up. that's way I'm looking at a mixing valve
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Ok, so when your heading demand increases, your system cannot satisfy the increase in demand? You are hinting at an outdoor reset or setpoint type of PID control to auto adjust your supply water temperature. Again, this works very well with a big fat slab. With a hanging pipe or staple up system, you don't have the "thermal mass flywheel" to level out the heat supplied to your zones, nor the higher thermal efficiency of direct contact conduction that heat spreaders provide.
If your floor isn't radiating enough heat, it needs to be made to do so before you start reducing your heat source. Once it can " burn you out" of your heating zones, then the duty cycle or source temperature can be lowered.
Tekmar has some awesome stuff to look at in their support section:
http://www.tekmarcontrols.com/suppor...oor-reset.html
From the linked page, just browse around the related topics to get a good picture of the how and why this stuff works.