If we want to bathe in an energy-conscious way during this rainy spring

At the moment there is simply one topic on which everyone agrees and everyone can have a say – the weather. For most of us, the weather at the moment is more reminiscent of autumn than early summer. But we now know it officially, May 2013 was particularly wet with around 127 liters of precipitation per square meter and quite cool with a nationwide average temperature of 11.7 degrees Celsius. May was also particularly poor in sunshine, as the magazine quotes from the official report from the German weather service, because with 131 hours of sunshine it remained a third below its climate value of 196 hours.

What are we going to do with this spring that doesn’t really deserve its name? If we don’t have to work or live in a flood region and have to help, we hide in the house and wrap up in a blanket with a book or the laptop. I won’t turn on the heating in June, where can I go then? Had someone turned on the heating in May?

Off to the bathtub like in autumn?

But if you have your own tub, you could lie down in the bathtub, like in autumn or winter. I know a bath uses three times as much energy and water as a five-minute shower. But for those who still want to enjoy some warmth in the tub, I have a few tips here.

Adjust flow heater correctly

If the water is heated electrically with a flow heater, you should pay particular attention to the consumption of warm water. The set temperature should not be more than 60 degrees. However, since you have to add cold water anyway and the warm water is not stored, 35 to 45 degrees are also sufficient.

To save electricity, you can also connect flow heaters to the solar thermal system. Sounds strange at first, but you save yourself – at least for the taps with flow heaters – the storage of warm water.

Temperature in the hot water tank

From a purely energetic point of view, the temperature of the water in the storage tank could be reduced to 35 to 45 degrees, but this would cause hygiene problems. To prevent the formation of legionella, a temperature of 60 degrees should always be ensured in the hot water tank. The Federal Environment Agency provides good information in a statement on saving energy in hot water preparation.

Insulation of the pipelines

All exposed piping for hot water supply should be insulated to avoid unnecessary heat loss. The portal EnEV-Online offers current requirements according to the EnEV 2009.

single lever mixer

The old taps for cold and hot water are probably still there. With these, it always takes much longer to reach the desired temperature and a lot of water is wasted. Single lever mixer taps, on the other hand, save water and energy. They should be taken for granted today.

Water heating

After distribution and consumption, finally a few words about hot water preparation. A central supply of hot water in combination with the heating system is usually more economical and therefore preferable. An additional option to reduce oil and gas consumption is to connect it to a solar thermal system. It is also important that warm water is available at the respective tap as quickly as possible and that cold water does not run for a long time.

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