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Legionellae are bacteria that are often found in the environment but also in the workplace: in domestic hot water systems, cooling systems, air conditioning systems, etc. They can cause epidemics or isolated cases of legionellosis (Legionaire’s disease). Legionellae remain in a latent state in cold water (below 20°C) and can proliferate in warm water (from 20°C up to 45°C). They can be eliminated (in a few hours), however, at temperatures higher than 50°C – or in a few minutes above 60°C.
The “ Tank-in-Tank " system prevents the formation of warm pockets because even the base of the inner tank is a heat exchanger that remains at the temperature of the boiler (typically from 60 to 80°C) : thus, any “ Tank-in-Tank " operating at 60°C ensures DHW that is free of legionellae and safe for the consumer. |
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