Steam produced is always at 100 degrees Celsius BUT it's not there to heat your shower cabin or you. It is there to increase humidity to 100% or as near as possible. You will notice you can set the steam to reach up to 60 degrees but this does not mean your cabin will ever reach this and to be honest, you wouldn't want it to either. Much of the steam will condensate in the cabin, on the surfaces, and on yourself, therefore, will struggle to reach such a high temperature. Typically expect to achieve around 38-40 degrees for the most part of your steam session. 

Top Tip: The colder the cabin, the longer it will take to build up the steam due to condensation. Therefore in the colder, winter months, it may take longer to build up the steam as appose to the warmer, summer months.