Unvented gas heater — An Unvented or unflued gas heater vents combustion by products (carbon monoxide, nitrogen dioxide and water vapour into the room). [ [http://www.health.nsw.gov.au/factsheets/environmental/gas heaters fs.html Unflued gas heaters Factsheet NSW… … Wikipedia
Kerosene heater — A kerosene heater, also known as a paraffin heater, is a portable, unvented, kerosene fueled, space heating device. In the United States they are used mainly for supplemental heat or as a source of emergency heat during a power outage. In some… … Wikipedia
Space heating — is the heating of a space, usually enclosed, such as a house or room. A space heater keeps the air and surroundings at a comfortable temperature for people or animals, or even plants in a greenhouse. Space heating generally warms a small space,… … Wikipedia
Water heating — is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have… … Wikipedia