Heated tables make for a more consistent playing of the cloth: it controls the level of humidity of the cloth.
In carom and 3cushion they say "it makes the table play longer and faster"
A view of our 6 carom tables, the 4 left ones are tournament pro size.
2 times model Bitalis 2001 from Breton, 1 Toulet and 1 Verhoeven.
On the left - not visible - we have seating for about 50 spectators.
Every (normal) year world famous players come play in our competition: Raymond Ceulemans and family, Ludo Dielis, Frederic Caudron, Eddy Merckx, Eddy Leppens, Dick Jaspers, Torbjorn Blohmdal, Richard Bitalis, Jeremy Bury and many more.
In Belgium, the Netherlands and France, 3cushion (inter)national competition and tournaments only use heated tables.
Heated snooker tables, I only know of a few in my country: this is not mainstream. In the UK there will be plenty.
The rumour goes that the new snooker tables to be installed in a couple of months (Rasson magnum II) will be equipped with a heating system, but will not be connected (due to all world problems the power bills in my country are now times 2 or 3 in regard to 2020)