Review on Natural Gas Heater: Mr. Heater Vent-Free 20,000 BTU Blue Flame - Multi-Size Option by Robert Jackson
Good Quality, Not Great Without Venting
This is supposed to be usable without venting but even with a nearby door partially open the fumes gave us a headache. Works better sitting inside an empty fireplace with the flue at least partially open, but then much of the heat goes up the chimney.
- Automatic low oxygen shut-off system (ODS). CSA Certified. Use - Supplemental heat in cold rooms, Additions, Sun rooms, Cabins
- May damage or stain walls over time
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