Based on the following passage, homeowners with what type of heating system should be particularly concerned with carbon monoxide? Carbon monoxide is a colorless, odorless gas that can seep into a home or building through a faulty heating system. It often arises from burning of fossil fuels. Experts estimate that roughly 200 people die each year due to carbon monoxide poisoning in the home. To reduce risk of carbon monoxide poisoning, all buildings should be equipped with carbon monoxide detectors, just as all buildings should also have smoke detectors to prevent deaths due to fire.

solar-powered heater

gas furnace

electric heater

geothermal boiler system