Vent-free, propane-fueled space heaters are incredibly efficient. In fact, based on manufacturers’ data, they’re 99.9 percent efficient.
These heaters also include a smart-safety feature called an oxygen depletion sensor.
This device protects against the dangers of carbon monoxide by automatically turning
off the heater if oxygen levels drop below specified thresholds. Some models also offer thermostats and heat distribution blowers for more efficient operation.
Don’t Heat up the Environment.
Mother Nature also prefers propane-fueled space heaters. They produce fewer air pollutants and greenhouse gas emissions than space heaters using fuel oil.