Installation and operating instructions
Fresh water station WHI freshaqua 44; Fresh water station WHI freshaqua 55
83514402
▪
1/2017-08
▪
Ext. PAW
15-36
4.1
Dimensioning the storage
Using the following table, you can calculate the approximate required volume of the
buffer tank.
Tem perature in the
buffer tank
Hot water tem perature set
on the controller
Required storage volum e
per litre hot water
50 °C
45 °C
1.3 litres
45 °C
0.8 litres
60 °C
50 °C
1.0 litres
55 °C
1.4 litres
45 °C
0.7 litres
70 °C
50 °C
0.8 litres
55 °C
0.9 litres
45 °C
0.5 litres
80 °C
50 °C
0.6 litres
55 °C
0.7 litres
Calculation example for dimensioning the buffer tank:
Buffer tank temperature: 60 °C
Required tapped flow rate at the tap: 20 l/min
DHW temperature set on the controller: 45 °C
How large does the tank have to be if tapping is carried out for 20 minutes without
reheating?
20 l/min x 20 min = 400 l
400 l x 0.8 = 320 l
The heated part of the buffer tank must have a volume of 320 litres.
