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Application guidelines
Installer reference guide
38
ERLA EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10
6.4 Setting up the domestic hot water tank
6.4.1 System layout – Integrated DHW tank
A
a
b
A
Domestic hot water
a
Cold water IN
b
Hot water OUT
6.4.2 Selecting the desired temperature for the DHW tank
People experience water as hot when its temperature is 40°C. Therefore, the DHW
consumption is always expressed as equivalent hot water volume at 40°C.
However, you can set the DHW tank temperature at a higher temperature
(example: 53°C), which is then mixed with cold water (example: 15°C).
Selecting the desired temperature for the DHW tank consists of:
1
Determining the DHW consumption (equivalent hot water volume at 40°C).
2
Determining the desired temperature for the DHW tank.
Determining the DHW consumption
Answer the following questions and calculate the DHW consumption (equivalent
hot water volume at 40°C) using typical water volumes:
Question
Typical water volume
How many showers are needed per
day?
1 shower = 10 min×10 l/min = 100 l
How many baths are needed per day?
1 bath = 150 l
How much water is needed at the
kitchen sink per day?
1 sink = 2 min×5 l/min = 10 l
Are there any other domestic hot water
needs?
—
Example:
If the DHW consumption for 2 persons per day is as follows:
▪
1 showers
▪
1 bath
▪
2 sink volumes
Then the DHW consumption = (1×100 l)+(1×150 l)+(2×10 l)=270 l
