I am installing a new sauna stove in the basement of a house. It is a 6kW Harvia stove. It is 240V running in 1 phase.

Do I need a GFI breaker for it? It does not mention it in the installation guide I received with the stove.

Thanks

A sauna does not require GFI protection. You may have a 30 amp GFI breaker if you like, but not necessary.