Quiet Switching</br>Heat only</br>2 wires</br>Mercury Free</br>Compatible with central gas or oil heating</br></br>Product Description</br></br>The Honeywell CT50K1002 Standard Heat Only Manual Thermostat can be used with Central Gas or Oil Heating systems. Features: Quiet Switching?? Heat Only?? 2 Wires and Mercury Free.</br><br/>http://www.amazon.com/gp/product/B000KFCLCK