http://www.articleheaven.net en-us editorial@articlealley.com As the name suggests, ventless gas heaters are room-heating furnaces that do not let the air to vent outside a room. Ventless heaters are a hot favorite among the consumers these days, as they are much more efficient than the traditional heating systems. ... http://www.articleheaven.net/all-about-ventless-gas-heaters-1553662.html 18th May 2010