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Advice to save energy on summer days ?: Water not lower than 60 degrees – risk of legionella

Energy saving tip for summer days?
Water not lower than 60 degrees – risk of legionella

Energy should be saved like crazy. Even with hot water. However, the temperature should not be lowered too much in the long term, as this can have serious health consequences.

Taking a shower that isn’t that hot, especially on hot summer days, sounds like simple energy saving advice, and it is. After all, if you lower the base temperature of your hot water, which is controlled by an instant electronic water heater or under-sink accumulator, to 60 degrees, you’ll spend about ten percent less on energy costs per year. This was calculated by the non-profit consultancy co2online, based on the annual average values ​​of the Federal Energy and Water Management Association (BDEW) for 2021. It was 32.16 cents per kilowatt hour (kWh ). With prices currently on the rise, savings are likely to be even higher.

What initially sounds like a loss of comfort usually isn’t at all. Because 60 degrees refers to the preset maximum temperature. It shouldn’t be outdone, because at these temperatures the harmful bacteria, legionella, die. Bacteria find ideal growing conditions at temperatures between 25 and 45 degrees Celsius. At water temperatures above 55 degrees, germ growth is inhibited according to the RKI. At over 60 degrees, germs die. Once the bacteria are there, they enter the airways with the first jet of water, finely atomized – in the bathroom, in the kitchen and wherever the tap is turned on.

the water must flow

Legionella can cause diseases in humans, from flu-like symptoms to severe pneumonia. People with weakened immune systems and certain underlying diseases such as diabetes and heart and lung disease are particularly susceptible to Legionella. Smokers and the elderly are also considered to be more at risk. Men get sick two to three times more often than women. The disease is fatal in about 5-10% of patients.

According to the Drinking Water Ordinance, condominium owners are obliged to avoid stoppages in drinking water pipes. The fundamental principle is therefore: “The water must flow!”. If this is not possible during normal operation, technical solutions such as hygienic rinsing systems for cold and hot drinking water could be used.

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