If you have calcium/magnesium in your feed water this thing can help reduce the need for maintenance (descaling) of the boiler in WaterStillar Wall and WaterStillar Family.
It is 2 strong neodyme magnets that you simply push over the feed pipe to the boiler. It takes 10 sec to install and will live there for years. No energy needed.
When installed the automated flush will flush out more calcium and thereby reduce the need for manual descaling.