Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Chaudière-fr#Sense
Caldaia solare-it#Sense
Bouilleur-fr#Sense
Zonneboiler-nl#Sense
Solar boiler-en#Sense
Sonnenheizkessel-de#Sense
Solkedel-da#Sense