\nA pH value outside the recommended range does not cause immediate problems \u2013 but it causes continuous long-term effects<\/strong>.
\nAnd that is exactly what makes it so dangerous for heating systems.<\/p>\n
The pH Value: A Key Control Parameter in Heating Systems<\/h2>\n
The pH value describes whether water behaves acidic, neutral, or alkaline.
\nIn technical systems, it has a significant influence on:<\/p>\n
- \n
- corrosion behaviour<\/li>\n
- material compatibility<\/li>\n
- the stability of chemical processes within the heating circuit<\/li>\n<\/ul>\n
Even small deviations can lead to significant long-term damage \u2013 particularly in modern systems with complex material combinations.<\/p>\n
To prevent the pH value from becoming an unknown variable, reliable and reproducible measurements are essential<\/strong>.
\nProfessional measuring devices such as the WaterBoy<\/strong> allow accurate on-site pH measurement and at the same time provide a reliable basis for documentation and evaluation.<\/p>\n<\/div>![\"WaterBoy](\"https:\/\/uws-technologie.de\/wp-content\/uploads\/Messkoffer-Set_WaterBoy-300x200.webp\")
<\/div>Messkoffer WaterBoy<\/h3>The UWS WaterBoy measuring case contains everything the HVAC specialist needs to measure data in accordance with the VDI 2035, \u00d6NORM H 5195-1 and SWKI BT 102-01 standards in two L-BOXXES.
To the product<\/a><\/div><\/div>\nWhy \u201cSlightly Off\u201d Is Not a Minor Issue<\/h3>\n
In practice, one often hears statements such as:<\/p>\n
“The pH value is not perfect, but still acceptable.”<\/p>\n
This mindset is problematic.
\nThe pH value does not act at a single point in time \u2013 it acts continuously, 24 hours a day, over many years<\/strong>.<\/p>\nA permanently incorrect pH value can lead to:<\/p>\n
- \n
- accelerated corrosion<\/li>\n
- dissolution of protective oxide layers<\/li>\n
- increased release of metal ions<\/li>\n
- increasing formation of magnetite<\/li>\n<\/ul>\n
All of this develops gradually and often remains unnoticed unless the system is measured and documented regularly.<\/p>\n
Low pH Value: Corrosion in Continuous Operation<\/h3>\n
If the pH value is too low, the heating water becomes acidic.
\nThe consequences are particularly severe for metallic components.<\/p>\nTypical effects include:<\/p>\n
- \n
- increased material dissolution<\/li>\n
- pitting corrosion<\/li>\n
- damage to steel and copper components<\/li>\n
- increased iron release \u2192 magnetite formation<\/li>\n<\/ul>\n
Especially in systems with steel pipes or cast iron components, a low pH value represents a significant risk factor.
Without regular monitoring, these processes often remain undetected until the first damage becomes visible.<\/p>\nHigh pH Value: Risk for Aluminium and Seals<\/h3>\n
An excessively high pH value can also be problematic \u2013 particularly in modern systems.
\nAluminium reacts sensitively to strongly alkaline environments.<\/p>\nPossible consequences include:<\/p>\n
- \n
- damage to aluminium heat exchangers<\/li>\n
- destruction of passive protective layers<\/li>\n
- Leaks<\/li>\n
- premature component wear<\/li>\n<\/ul>\n
A high pH value can appear deceptively harmless, as corrosion is not immediately visible but develops gradually over time.<\/p>\n
Mixed Materials Make pH Control Especially Critical<\/h3>\n
Modern heating systems rarely consist of a single material.
\nTypical combinations include:<\/p>\n- \n
- steel<\/li>\n
- copper<\/li>\n
- aluminium<\/li>\n
- stainless steel<\/li>\n
- plastics<\/li>\n<\/ul>\n
Each of these materials reacts differently to pH levels.
A value that is acceptable for one material may already be critical for another.<\/p>\nTherefore, the following applies:
\nThe correct pH value is always material-dependent \u2013 never universal.<\/strong><\/p>\nGuidelines Provide Orientation \u2013 But Do Not Replace Monitoring<\/h3>\n
The VDI 2035<\/a> guideline specifies recommended pH ranges for heating systems.
\nHowever, it is important to understand:
\nIt is a technical guideline<\/strong>, not a mandatory standard \u2013 and it must be actively implemented in practice.<\/p>\nThis means:<\/p>\n
- \n
- measuring the pH value regularly<\/li>\n
- taking deviations seriously<\/li>\n
- not relying on a single measurement<\/li>\n<\/ul>\n
A pH value that is initially adjusted correctly will not automatically remain stable \u2013 especially if make-up water is added regularly.<\/p>\n
Make-Up Water Gradually Changes the pH Value<\/h3>\n
One of the most common reasons for pH shifts is make-up water addition.
\nEvery litre of newly introduced water can:<\/p>\n- \n
- alter the pH value<\/li>\n
- weaken buffering effects<\/li>\n
- disturb existing chemical equilibria<\/li>\n<\/ul>\n
This becomes particularly critical when:<\/p>\n
- \n
- untreated water is added<\/li>\n
- no follow-up measurement is carried out<\/li>\n
- changes remain unnoticed<\/li>\n<\/ul>\n
Professional make-up systems from the Heaty Complete series<\/strong> ensure that every make-up process is automatically treated and controlled<\/strong>.
\nThis prevents uncontrolled pH drift and helps maintain stable water chemistry.<\/p>\n<\/div>![\"Heaty](\"https:\/\/uws-technologie.de\/wp-content\/uploads\/Complete_professional-243x300.png\")
<\/div>Heaty Complete Professional<\/h3>Heaty Complete PROfessional is the world’s first smart IoT make-up system, including Cloud connection – fully automatic, leakage protection and digital water meter.
To the product<\/a><\/div><\/div>\nStabilizing the pH Value Instead of Only Measuring It<\/h3>\n
Measurement alone is not enough \u2013 stabilization is crucial.
\nThis is where targeted water treatment media come into play.
The Vadion pH-Control mixed-bed resin is designed not only to demineralize heating water but also to stabilize the pH value within the recommended range.
This makes it possible to:<\/p>\n
![\"Mixed](\"https:\/\/uws-technologie.de\/wp-content\/uploads\/vadion_ph_control_produktabbildung-300x300.webp\")
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