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Propane- and kerosene-fueled heaters are prodigious heat producers. But because of their open flames, the risk of carbon-monoxide poisoning, and the hazard associated with handling the fuel, it's best not to use them indoors, except in areas with good ventilation.
We tested two propane models, the Mr. Heater Tough Buddy MH18B, $140, and the Charmglow Blue Flame Heater With Thermostat CGL300TB, $200, and two that use kerosene, the DynaGlo Radiant RMC-55R7 $100, and the DuraHeat Portable DH2304, $125. None fared well in our safety tests and all produced a small but measurable level of CO and emitted particulates, though not enough to be a serious hazard. The propane models have a low-oxygen shutoff valve; the kerosene heaters, a ...