News 27/10/2026Safe heating system top-up: drinking water protection with a Type BA backflow preventer
How can the topping up of heating systems be carried out in accordance with regulations and in an aseptic manner? Our new application report shows how the GOETZE 9660 Type BA backflow preventer reliably protects drinking water and why the use of lead-free materials plays a key role in this.
Heating system top-up is an unavoidable interface between the drinking water system and the heating system, and is therefore a sensitive area in building technology. Without suitable safeguards, pressure fluctuations in the drinking water network can cause heating water to flow back and compromise the quality of the drinking water.
This is precisely where our latest application report comes in. Using the GOETZE 9660 type BA backflow preventer as an example, we demonstrate how this critical connection can be protected reliably and in accordance with standards.
In accordance with DIN EN 1717, heating water is classified as fluid category 4. This means it may contain substances that pose health risks. Consequently, the use of a type BA backflow preventer is required to reliably prevent back pressure, backflow and back-suction.
The GOETZE 9660 type BA backflow preventer operates on a three-zone pressure principle, thereby ensuring a clear hydraulic separation between drinking water and the heating system, both during normal operation and in the event of a fault. Protection remains reliable even in the event of a pressure drop on the drinking water side.
A key advantage in practical use is the choice of material:
The backflow preventer is made of lead-free brass and therefore meets the high standards for hygiene and safety required in drinking water installations. This aspect is becoming increasingly important, particularly in light of growing regulatory requirements.
In addition to its reliable operation, the backflow preventer also impresses with its compact design and low pressure drop. This enables easy integration into existing systems and supports cost-effective operation.
Whether in residential buildings, commercial properties or industrial applications – wherever heating systems are connected to the drinking water supply, the GOETZE 9660 type BA backflow preventer ensures long-term protection in accordance with standards.
👉 Read the full case study now and find out how to ensure the safety of your heating system top-ups and their future-proofness.