Thermostat for unheated zone

TomS

I have hot water baseboard heat. I am going to add another zone to a room that is presently unheated and will be infrequently used during the winter. I know that there is a thermostat that will circulate water on a timed basis just to keep the pipes from freezing but forgot the name of it. Can anybody help?

TomS

In answer to my own question I found the device. It is called Thermguard.
http://www.bearmountaindesign.com/