About: http://webisa.webdatacommons.org/3633440

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Although there have been some advances in storage heater designs and materials, especially in insulation, the increases in energy efficiency (about 15 percent) in the past 20 years have not been as dramatic as with other appliances.
http://www.w3.org/ns/prov#wasQuotedFrom	motherearthnews.com