We are looking for programmable setback thermostats for our radiant
hot water heating system in our building.
Freeze control is the real driving requirement, as the rads are on
outside cold wall of the units, and have a tendancy to freeze solid
with the resulant mess in winter.
To prevent that, a program that temporarily cycles the heat on is
needed (for instance 1 out of every 30 minutes), in addition to the
normal freeze control program that is based on ambient air temp. The
heater control is a normally closed (NC) circuit, where an open
circuit causes the valve to open and hot water to circulate.
Can anyone point me to programmable thermostats with all of these
Any help much appreciated.
Cross posted to alt.hvac