|shop = furnace|
|Using this tag is discouraged, use shop=fireplace instead.|
|Used on these elements|
|Tools for this tag|
This tag is deprecated. A furnace is a big oven used for melting metals in British English, and it can also mean a central heating unit in American English. While some people also applied this tag for shops selling cooking stoves.
For shops selling wood, gas or electric fireplaces, use shop=fireplace. Central heating units using hot water normally have to be installed by and bought from a plumber, so consider using craft=plumber in this case.