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The Mr. Heater MH9BX is a radiant propane heater that runs on a 1 lb cylinder and puts out 4,000 to 9,000 BTU, enough for a large tent or a small enclosed space up to about 225 square feet. It lights with a pilot knob and push button, has a fold-down handle and a swivel regulator that can be adapted to a remote tank with a hose and filter. Three safety shut-offs cover tip-over, pilot outage and low oxygen. It is a simple, proven design that owners like for quick heat in tents, garages and job sites; rivals in the same class add little beyond similar BTU output, and some add a fan or battery ignition.
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Owners treat it as a reliable workhorse for tents, garages and emergency heat, and the safety shut-offs come up often as a reason to trust it. Complaints center on propane use and on the unit cutting out in cold or at altitude.
This is a portable radiant propane heater with an output of 4,000 to 9,000 BTU. It heats spaces up to 225 square feet and is approved for outdoor use. It burns clean and is nearly 100 percent efficient. It can also heat enclosed spaces such as large tents.
The heater connects directly to a 1 lb. propane cylinder. A swivel-out regulator lets you switch from a disposable cylinder to a remote gas supply if you add a hose and filter. A fold-down handle keeps the footprint compact.
To light it, turn the knob to pilot and push. The built-in Piezo sparking mechanism lights the pilot. An Oxygen Depletion Sensor and a tip-over switch shut the heater off automatically. It also shuts off if the pilot light goes out. Above 7,000 feet above sea level, the heater may shut off.
