{"id":8172,"date":"2025-12-01T08:16:42","date_gmt":"2025-12-01T07:16:42","guid":{"rendered":"https:\/\/uws-technologie.de\/heating-water-march-but-please-comply-with-the-guidelines\/"},"modified":"2025-12-01T08:16:42","modified_gmt":"2025-12-01T07:16:42","slug":"heating-water-march-but-please-comply-with-the-guidelines","status":"publish","type":"post","link":"https:\/\/uws-technologie.de\/en\/heating-water-march-but-please-comply-with-the-guidelines\/","title":{"rendered":"Heating water, march\u2014but please comply with the guidelines!"},"content":{"rendered":"

What VDI 2035 really says (and how you can safely comply with it in everyday life)<\/h2>\n

If you want to operate heating systems reliably, efficiently, and without consequential damage, you need to master the topic of heating water quality<\/strong>. This is exactly where VDI 2035 comes in. It describes the state of the art for hot water heating systems (< 100 \u00b0C) and bundles the central requirements for filling, supplementary, and circulating water<\/strong> \u2013 so that limescale<\/a>, corrosion<\/a>, sludge, and air don’t stand a chance. <\/p>\n

Important for classification:<\/strong> The currently applicable version is VDI 2035 Sheet 1 (03\/2021). It combines the topics of stone formation<\/strong> and water-side corrosion<\/strong> in one document. Sheet 3 (exhaust-side corrosion) exists separately. Many industry articles casually refer to the “new VDI 2035,” even in 2023\u20132024, but in terms of content, they refer to<\/strong> the 2021 edition<\/strong>. <\/p>\n

The 4 adjustment screws for heating water quality (short & sweet)<\/h3>\n

From practice for practice \u2013 that is crucial:<\/p>\n

    \n
  1. Reduce hardness\/lime (scale)<\/strong>
    \nTarget value for fill water:<\/strong> \u2248 0.3 \u00b0dH<\/strong> (soft to fully desalinated). This prevents limescale formation and keeps heat exchangers efficient. <\/li>\n
  2. Keep conductivity low<\/strong>
    \nFor low-salt operation<\/strong>, the guideline value in operation:<\/strong> \u2264 100 \u00b5S\/cm<\/strong> \u2013 the lower, the better against corrosion.<\/li>\n
  3. Adjust the pH value appropriately<\/strong>
    \nGeneral:<\/strong> 8.2\u201310.0<\/strong>
    \nWith aluminum components:<\/strong> 8.2\u20139.0<\/strong> (drive more carefully, otherwise aluminum will corrode). Only evaluate pH after the running-in phase (8\u201312 weeks). <\/strong><\/li>\n
  4. Avoid oxygen<\/strong>
    \nOxygen accelerates corrosion. Guideline values in practical literature: < 0.1 mg\/l<\/strong> for low-salt operation; often even stricter for salt-containing operation (< 0.02 mg\/l<\/strong>). Build\/maintain the system so that O\u2082-entry is minimal<\/strong> (diffusion-tight materials, tight screw connections, degassing). <\/li>\n<\/ol>\n

    Chemicals?<\/strong> VDI 2035 considers low-salt operation<\/strong> (demineralized water) to be the preferred method. Inhibitors & O\u2082binders<\/strong> increase conductivity and are exceptions<\/strong>, not standard.<\/p>\n

    <\/div>\"Heaty<\/div>

    Heaty Ferriline No. 2<\/h3>Complete unit for professional bypass treatment, sludge and magnetite filtration in the hot water area incl. MAGella twister
    To the product<\/a><\/div><\/div>\n

    The scope of application:<\/h3>\n