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Thermostat choices with Taco SR502

This is a last piece in my puzzle.

2 zones:
- high temp underfloor
- low temp slab

1 primary pump, 2 secondary pumps (one with I-series setpoint mixing valve), Trinity Ti100 w/ Sentry 2100 control, Taco SR502 switching relay).

There already is one thermostat in a slab zone (it does central air heating and cooling). I am not sure if there is a thermostat that would do all in one (3 sources: central air HAC + radiant H) or I should just add on another dedicated heating only thermostat?

Second zone thermostat would do radiant only.

Any suggestions? Tekmar? Honeywell?
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