Infratech Comfort 3 Zone Analog Solid State Controller w Digital Timer h19.5 this insert fits most sizes Thermostat assures the temperature this insert fits most sizes of existing masonry and zero clearance wood burning fireplaces eliminating hot spots common with loose fill type insulations You could then control 3 Relays from 1 Solid State Dial Control Ideal when using multiple heaters to set up zones for a variety of simple or complex applications Infinite Heat Control Use Any Switch Solid State Control Packages work in conjunction with Infratech’s Analog Controllers Only Timer Analog Controllers are offered with or without Digital Timers Remote Dimming Zoning Capabilities Smart Phone Tablet Application NEMA Rating NEMA 12 Analog NEMA 4 Panel Wiring Diagrams Provided Tested Before It Leaves The Factory Assigned a UL Listing Number Panel Built Job Specific Enclosure Rating Type 1 (must be installed in a protected location) Overall Dimensions 15" (W) x 5