When installing a new heat pump or boiler, ensuring the quality of the water in your heating system is essential. It is essential for both long-term performance and efficiency.
Here’s what we do to make sure your system water is in the best possible condition and why it matters for the health of your system.
What We Do for Your System Water
At the end of every installation, we thoroughly flush the system and clean all filters. We then fill it with demineralised water following the German Water Quality Standard VDI 2035. This is known for its high standards but isn’t commonly used in the UK. By going the extra mile, we provide better protection and performance for your heating system.
Why Is Demineralised Water Important?
Using demineralised water in your system offers several benefits:
- Prevents Corrosion and Scaling: Lowering the water’s conductivity (the ability to conduct electricity) helps prevent metals from reacting with each other. This reduces corrosion. It also keeps salts and minerals from building up in your system’s heat exchangers or pipes which avoids the scaling that can reduce efficiency.
- Maintains the Right pH Levels: The acidity or alkalinity of the water (pH level) plays a big role in how your system will perform. If the water is too acidic or too alkaline, it can damage certain metals, especially aluminium. We make sure the pH is neutral, so your system stays protected.
- Limits Oxygen Content: Oxygen in the system water is a major cause of corrosion. We ensure your system is sealed to keep oxygen levels low. This helps prevent rust and other damage. Regularly adding fresh water with high oxygen content can lead to corrosion, so this should be avoided.
Regular Testing to Keep Your System Healthy
Testing the water quality in your system every year during service is crucial. This lets us see if anything has changed, such as the presence of new corrosion or a drop in water quality. If necessary, we can take action before any serious issues arise, such as flushing the system to clean it out.
Why Use Demineralised Water Instead of Chemicals?
Many systems rely on chemical inhibitors to slow down corrosion. However, they don’t always reveal what ingredients are in them. Instead of continuously adding chemicals to control corrosion, we start by filling your system with the cleanest, purest water to prevent it from happening in the first place.
By maintaining the best water quality from the start and testing it regularly, we help protect your heating system, ensuring it runs smoothly and efficiently for many years.
If you are interested in a renewable heating system for your home, contact us today for helpful technical advice.

Related articles
June 11, 2023
7 Important Factors With Underfloor Heating
Underfloor heating isn't just a few pipes in the ground, there have or should have been careful planning and design gone into the system to allow it to work correctly, more so with low temperature systems and heat pumps.
April 23, 2023
What Is A Low-Temperature Heating System?
Low-temperature heating systems are where all domestic heating systems should be. It's what's required if we are to install more heat pumps but also has huge benefits to gas boiler installations.
February 26, 2023
How To Control Your Heat Pump For Maximum Efficiency
To achieve the highest Scop (efficiency) your heat pump must be running off its own controller and have limited interference from external stats.
January 2, 2023
Why A Heat Loss Report Is Essential Before Installing A Heat Pump
The benefits and knowledge of this heat loss is invaluable to any engineer or homeowner looking at getting the maximum efficiency out of their systems and making sure that the property has the correct sized heat source and also the correct size emitter for the property to maintain the desired indoor temperature whatever the outdoor temperature.
December 18, 2022
Proof Of Efficiency With Heat Pumps
We offer all our customers the opportunity to include 'Open Energy Monitoring', this shows us their energy usages, there performances, their Cop/ Scop (seasonal co efficient performance) or in layman's terms how much electric to heat generated they are using.
December 11, 2022
Why Your New Heat Pump Is Costing You A Fortune To Run
I wouldn't be where I am today without the types of leading industry training from Heat Geek or Northampton Academy teaching correct system design especially for low temperature systems and heat pumps that run at the lower difference of temperature of 5deg.