Electronic instantaneous water heater: Taking a shower is so expensive
Water heating with an electronic instantaneous water heater is still common practice in many rented apartments. This results in the following costs for daily showering:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,88 Euro | 0,35 Euro | 1,23 Euro | 449,09 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,85 Euro | 0,35 Euro | 1,20 Euro | 437,57 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,82 Euro | 0,35 Euro | 1,17 Euro | 426,05 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,77 Euro | 0,30 Euro | 1,08 Euro | 392,96 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,66 Euro | 0,26 Euro | 0,92 Euro | 336,82 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,71 Euro | 0,28 Euro | 0,98 Euro | 359,27 Euro |
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Gas heating: That’s how expensive showering is
If you heat your water for the shower with a low-temperature boiler for natural gas, the costs are as follows:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,91 Euro | 0,35 Euro | 1,26 Euro | 458,38 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,88 Euro | 0,35 Euro | 1,22 Euro | 446,53 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,84 Euro | 0,35 Euro | 1,19 Euro | 434,67 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,80 Euro | 0,30 Euro | 1,10 Euro | 401,08 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,74 Euro | 0,26 Euro | 0,94 Euro | 343,79 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,73 Euro | 0,28 Euro | 1,00 Euro | 366,71 Euro |
—
Condensing boiler (natural gas): That’s how expensive showering is
If you use a condensing boiler for natural gas to heat the water, the costs are as follows:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,61 Euro | 0,35 Euro | 0,95 Euro | 347,73 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,58 Euro | 0,35 Euro | 0,93 Euro | 339,83 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,56 Euro | 0,35 Euro | 0,91 Euro | 331,93 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,53 Euro | 0,30 Euro | 0,83 Euro | 304,27 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,45 Euro | 0,26 Euro | 0,71 Euro | 260,80 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,49 Euro | 0,28 Euro | 0,76 Euro | 278,19 Euro |
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Low-temperature boiler (heating oil): That’s how expensive showering is
If you heat your water for the shower with a low-temperature boiler for heating oil, the costs are as follows:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,97 Euro | 0,35 Euro | 1,32 Euro | 482,09 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,94 Euro | 0,35 Euro | 1,29 Euro | 469,39 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,90 Euro | 0,35 Euro | 1,25 Euro | 456,69 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,85 Euro | 0,30 Euro | 1,16 Euro | 421,83 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,73 Euro | 0,26 Euro | 0,99 Euro | 361,57 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,78 Euro | 0,28 Euro | 1,06 Euro | 385,67 Euro |
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Condensing boiler (heating oil): That’s how expensive showering is
Do you use a condensing boiler for heating oil for hot water preparation? Then the following costs arise for the shower:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,65 Euro | 0,35 Euro | 1,00 Euro | 363,54 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,63 Euro | 0,35 Euro | 0,97 Euro | 355,07 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,60 Euro | 0,35 Euro | 0,95 Euro | 346,60 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,57 Euro | 0,30 Euro | 0,87 Euro | 318,10 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,49 Euro | 0,26 Euro | 0,75 Euro | 272,65 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,52 Euro | 0,28 Euro | 0,80 Euro | 290,83 Euro |
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District heating: Taking a shower is so expensive
If the hot water is heated via district heating, the following costs arise:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,40 Euro | 0,35 Euro | 0,74 Euro | 271,86 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,38 Euro | 0,35 Euro | 0,73 Euro | 266,67 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,37 Euro | 0,35 Euro | 0,72 Euro | 261,47 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,35 Euro | 0,30 Euro | 0,65 Euro | 237,88 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,30 Euro | 0,26 Euro | 0,56 Euro | 203,89 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,32 Euro | 0,28 Euro | 0,60 Euro | 217,49 Euro |
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Heat pump: That’s how expensive showering is
If you heat your water for the shower with a heat pump, the costs are as follows:
–
| measure | energy costs per day | water cost per day | total cost per day | Total cost per year for daily showers |
|---|---|---|---|---|
| Water temperature: 38 degrees Celsius. Duration of shower: 8 minutes | 0,34 Euro | 0,35 Euro | 0,69 Euro | 251,63 Euro |
| Water temperature: 37 degrees Celsius. Duration of shower: 8 minutes | 0,33 Euro | 0,35 Euro | 0,68 Euro | 247,16 Euro |
| Water temperature: 36 degrees Celsius. Duration of shower: 8 minutes | 0,32 Euro | 0,35 Euro | 0,66 Euro | 242,68 Euro |
| Water temperature: 38 degrees Celsius. Duration of shower: 7 minutes | 0,30 Euro | 0,30 Euro | 0,60 Euro | 220,17 Euro |
| Water temperature: 38 degrees Celsius Shower duration: 6 minutes | 0,26 Euro | 0,26 Euro | 0,52 Euro | 188,72 Euro |
| Water temperature: 38 degrees Celsius Duration of shower: 8 minutes and economy shower head | 0,27 Euro | 0,28 Euro | 0,55 Euro | 201,30 Euro |
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Conclusion
The comparison shows that it is more expensive to take a longer shower than to take a slightly higher shower temperature. If you also install a shower saver head and thus reduce the amount of water poured out – i.e. the amount of water that flows out of the shower head per minute – you can save even more.
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