Atwood (38542 2-Stage Excalibur LP Gas Furnace with Digital Thermostat Atwood Model 2334 2-Stage Excalibur LP Gas Furnace with Digital Thermostat Designed to be energy efficient, Unique 2-Stage System: Set the temperature, turn the thermostat on automatic and let the furnace take over, During cold start-ups, the furnace operates on High Burn, High Fan for quick, quiet warm up Self Diagnostic Capability: This furnace is designed for long life but if you ever need service, it's made easier with built in self-diagnostics A flashing LED indicates low or improper voltage input, ignition failure, switches, and more for possible time and money savings Specifications: BTU input, Low: 23,000; BTU Input, High: 34,000. 12 Volt DC Amperage: low, 5.0 Amps - high, 10.5 Amps Width = 16.5 inch x Height = 7.375 inch x Depth= 18 inch, Advanced Digital Thermostat: Provides 13 heating/cooling functions