Heat will not shut off. We have three zones. Switched main one with another and it seemed to work although the battery holders are broken and had to tape the batteries in . What thermostat would be compattible with this one?

This site should be able to help answer your question: Honeywell | Thermostat | Air Cleaners | Humidifier | Ventilation | Water System | Home Security | Gas Detector | Honeywell Thermostats (http://yourhome.honeywell.com/Home/default.htm)