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Rinnai’s 99% efficient vent-free fan convector uses an electronically controlled modulating burner and modulating fan convector to deliver just the right amount of heat. An oxygen-depletion sensor shuts the unit down if room oxygen drops below safe levels. At full speed, the fan uses about 40 watts of electricity. It’s meant for use as a supplemental and emergency heater. Cost: $500 to $600. Rinnai, 800.621.9419, rinnai.us