The 1801 Portable Direct Fired Heater is a great medium-sized direct fired heater. It runs on both propane and natural gas, making it easy to switch from propane tanks to natural gas lines. It has an easy shutoff function if the voltage of the machine gets too low, and you can conveniently monitor your voltage to prevent problems.

Benefits of the 1801 Direct Fired Heater include:

• Tested to ANSI standard Z83.7 (1990)
• Safe fuel shutdown if combustion air is interrupted
• Low housing temperature
• Simple lever change from propane to natural gas
• Safe monitoring of combustion, two trial electronic ignitions with 15-second pre-purge time delay and 7.5-second shutdown
• Protects heater by shutting down if the unit is being overfired
• Helps in diagnosing specific gas flow problems
• Protects heater by shutting down if the voltage is too low
• Automatically cycles the heater on/off with a 5-second fan shutdown delay
• Easy monitoring of supply voltage to ensure trouble-free operation
• Indoor and outdoor usage