This 250,000 BTU heater is designed for greenhouse heating and or CO2 enrichment as well as horse stable heating. It is CSA and CE certified for use in greenhouses. It runs on Natural Gas or Liquid Propane and comes standard with a NG to LP conversion kit. The external housing, burner and combustion chamber are all made with high quality stainless steel to provide longevity. The combustion chamber is highly efficient resulting in a clean burn and ethylene content less than 0.6PPM. The HS250AG comes standard with automatic ignition and other safety features like an air flow switch, gas pressure switch, overheat monitoring, CO monitor and simple on-board diagnostics. It is designed to be suspended from the four stainless steel hanging bolts. HS250AG comes with a hook up for a local thermostat or can be set up to be managed by computer controlled thermostats. Other optional features include a delayed ignition relay so you can stagger start of multiple heaters, CO2 generator, moisture resistance starter and a remote failure alarm.