Daikin Altherma EHBH08DA6V7 - 5.4 Setting up the domestic hot water tank; 5.4.1 System layout - Standalone DHW tank; 5.4.2 Selecting the volume and desired temperature for the DHW tank

5 | Application guidelines
Installer reference guide
37
ERGA04~08DAV3(A) + EHBH/X04+08DA*V7
Daikin Altherma 3 R W
4P618958-1 – 2020.03
5.4 Setting up the domestic hot water tank
5.4.1 System layout – Standalone DHW tank
FHL1
FHL2
FHL3
M
a b c d e hf g
f
i j
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Pump
f Shut-off valve
g Motorised 3‑way valve
h Collector (field supply)
i DHW tank
j Heat exchanger coil
FHL1...3 Underfloor heating
5.4.2 Selecting the volume and 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 volume and desired temperature for the DHW tank consists of:
1 Determining the DHW consumption (equivalent hot water volume at 40°C).
2 Determining the volume and 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 of a family (4 persons) per day is as follows:
▪ 3 showers