We are upgrading the iStill 500! The power management will see a significant performance increase, and is upgraded from 18 kWh to a maximum of 21 kWh. An increase of 17%, resulting in faster heat-up and production times. How much faster? Well, up to 17% faster!
As of today, all orders received for the iStill 500 will be for the new, upgraded, 21 kWh version with the redesigned boiler.
Two of our iStills 500 on the island of Scilly …
The iStill Blog 
Well, the units of power (kW) are changed to energy (kWh), the still delivers power, and in time that is energy.