About: http://webisa.webdatacommons.org/249715599

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	However, they do not require a drain and can be made of materials such as iron, steel or copper that would eventually corrode in a condensing boiler.
http://www.w3.org/ns/prov#wasQuotedFrom	issuu.com