Knowledge about Legionnaires’ disease
Legionnaires’ disease is a type of pneumonia caused by the bacteria Legionella pneumophila. Legionella are bacteria that thrive in lukewarm, stagnant water. Infection can occur by inhaling water droplets (aerosols) contaminated with Legionella. As many different systems can spread aerosolized water, there are often multiple potential sources of infection, but showering is believed to be the most common route of transmission in homes (Source: Statens Serum Institut – Legionnaires’ disease).
Biofilm protects Legionella bacteria
Legionella can exist at various stages, including the MIF (Mature Infectious Form) where it has increased tolerance to heat and biocides, as well as a VBNC (Viable But Non-Culturable) phase where it is highly resistant to external influences. Legionella and biofilm are interconnected, as the biofilm protects Legionella. For example, in thermal disinfection, it is necessary to heat the entire pipe and biofilm to the desired temperature, which should be measured on the outside of the pipes (Source: EUDP2020 project ‘Legionella Secure and Energy Efficiency for Installations and Supply’, Interim Report 1, p. 10).
UVC hot water unit and Legionella
A UVC hot water unit effectively targets unwanted microorganisms when water is circulated past a UVC unit. This helps keep the levels consistently low in the circulating flow and reduces the risk of sudden blooms with increased health risks.
ND Water Hot UVC-units
Our UVC hot water units are developed and manufactured in Denmark for use in hot water up to 65 degrees. They are constructed from stainless steel 316 with an inner quartz glass where the bulb is mounted. This allows for bulb replacement without shutting off the water flow.
| Model | Capacity liters per hour | Temp. | Suitable for: | Lifespan: | Product image: |
|---|---|---|---|---|---|
| ND Water Hot 4000 | 0-4,000 l/h | 0-65 degrees Celcius | E.g. Hot water tanks size 100-4,000 liters or heat exchanger size 37-150 kW | Up to 16,000 hours / 2 years |  |
| ND Water Hot 8000 | 4,000-8,000 l/h | 0-65 degrees Celcius | E.g. Hot water tanks size 4,000-8,000 liters or heat exchanger size 150-350 kW | Up to 16,000 hours / 2 years |  |
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