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Domestic hot water devices

Energy saving tips

15 tips on how to save energy in domestic hot water preparation

1. Set the hot water temperature only as high as you need it. Use the energy saving setting on the device wherever possible.
2. In new buildings, it is a good idea to place rooms which are subject to high humidity close together (next to each other or above/below one another) eliminating the need for an extensive domestic hot water distribution system.
3. Thermally insulate hot water pipes in accordance with regulations.
4. If hot water extraction points are set far apart, it makes sense to install a DHW device in each of the places where the hot water is required.
5. Hot water circulation can, under certain circumstances, cause high heat losses and should be avoided if possible.
6. A significant proportion of the energy required for DHW preparation can be covered by environmental and waste heat through the use of heat pumps and solar collectors. Systems of this type require a central DHW system.
7. A boiling water device allows small quantities of water to be heated quickly and easily.
8. When selecting a hot water cylinder, choose only the volume that is actually required. Cylinders with a low stand-by energy consumption should be used wherever possible.
9. Hot water cylinders should be completely switched off before longer breaks in operation, e.g. before holidays; this should be done early enough for the hot water to be drained out.
10. The operating time of central systems with hot water circulation should be limited to certain times and depending on the temperature.
11. Extraction fittings should be selected which can be adjusted quickly (e.g. single-handle taps).
12. Long hot water pipes cost energy, water and money. Hot water pipes should therefore be kept as short as possible.
13. Set the desired hot water temperature directly on electronic flow heaters. This temperature remains constant, even when the water flow rate is low. This shortens the setting time for the extraction fitting and saves water.
14. Hydraulic and electronic flow heaters have no stand-by power consumption. These compact devices can be installed close to the consumer.
15. Taking a bath requires three times as much water and energy as taking a three-minute shower. So it’s better to have another shower than to take a bath.