Is the boiler made of RVS?
No, it's not. The boiler in the Stratus No.2 is made of solid brass. The quality of a brass boiler is much higher than for instance boilers made of aluminum.
How often do I need to descale a Cumulus No.3 or Stratus No.2? And how do I do?
We recommend that you descale your steamer every 20th refill of the tank. You can either use a universal descaler, we offer this in our webshop, or white, distilled vinegar. It's also great for other appliances like the coffeemaker etc.
See this video for how to descale [39 sek].
Or read this guide:
For white distilled vinegar: