An Unvented or unflued gas heater vents combustion by-products (
[ [http://www.health.nsw.gov.au/factsheets/environmental/gas_heaters_fs.html Unflued gas heaters Factsheet - NSW Department of Health ] ]
References
Wikimedia Foundation. 2010.
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
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
