{"id":8897,"date":"2026-01-26T15:59:52","date_gmt":"2026-01-26T14:59:52","guid":{"rendered":"https:\/\/uws-technologie.de\/top-10-mistakes-when-filling-the-heating-system-with-water-and-how-to-avoid-them-in-the-long-term\/"},"modified":"2026-01-26T15:59:52","modified_gmt":"2026-01-26T14:59:52","slug":"top-10-mistakes-when-filling-the-heating-system-with-water-and-how-to-avoid-them-in-the-long-term","status":"publish","type":"post","link":"https:\/\/uws-technologie.de\/en\/top-10-mistakes-when-filling-the-heating-system-with-water-and-how-to-avoid-them-in-the-long-term\/","title":{"rendered":"Top 10 mistakes when filling the heating system with water \u2013 and how to avoid them in the long term"},"content":{"rendered":"

Filling the heating system with water is not a minor step \u2013 it is the starting point for the entire system life cycle<\/strong>.
\nNevertheless, it is often carried out under time pressure, simplified, or done “as usual.”.<\/p>\n

The problem with this is that
\nerrors in filling do not have a short-term effect \u2013 they have an impact for years.<\/strong><\/p>\n

Below you will find the ten most common mistakes when filling heating water \u2013 with detailed explanations and clear solutions from practice.<\/p>\n

1. Filling with untreated tap water without subsequent treatment<\/h3>\n

Tap water is a high-quality foodstuff, but it is not a suitable operating medium for heating systems<\/strong>.
\nIt contains hardness minerals, dissolved salts, and ions, the composition of which varies greatly from region to region and is not tailored to the requirements of technical systems.<\/p>\n

In practice, filling with drinking water is not unusual at first.
\nHowever, it becomes critical if this water is not then specifically treated<\/strong>.<\/p>\n

This is because untreated tap water:<\/p>\n