|shop = furnace|
|Using this tag is discouraged, use shop=fireplace instead.|
|Used on these elements|
|Tools for this tag|
This feature has been labeled as deprecated. The recommended replacement is: shop=fireplace.|
The reason is documented in Deprecated features. You are still free to continue to use or interpret this tag as you see fit since OpenStreetMap does not have “banned features”. Under no circumstances should you (semi-)automatically change “deprecated” tags to something else in the database on a large scale without conforming to the Automated Edits code of conduct. Any such change will be reverted.
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.