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DHW cylinders
Performance factor N
L
To DIN 4708.
Cylinder storage temperature T
+ 50 K
+5 K/-0 K
and 70 °C heating water flow temperature.
Performance factor N
subject to the heat input delivered by the boiler (Q
L
Cylinder capacity
Q
in kW
D
15
18
22
27
33
Information regarding performance factor
The performance factor N
temperature T
.
cyl
Standard values
→ 1.0 × N
■ T
= 60 °C
10
cyl
L
→ 0.75 × N
■ T
= 55 °C
cyl
→ 0.55 × N
■ T
= 50 °C
cyl
→ 0.3 × N
■ T
= 45 °C
cyl
L
Peak output (over 10 minutes)
Relative to the performance factor N
DHW heating from 10 to 45 °C and 70 °C heating water flow temper-
ature.
Peak output (l/10 min) subject to the heat input delivered by the boiler (Q
Cylinder capacity
Q
in kW
D
15
18
22
27
33
Max. draw-off rate (over 10 minutes)
Relative to the performance factor N
With reheating.
DHW heating from 10 to 45 °C and 70 °C heating water flow temper-
ature.
Max. DHW draw-off rate (l/min) subject to the heat input delivered by the boiler (Q
Cylinder capacity
Q
in kW
D
15
18
22
27
33
Available water volume
Cylinder volume heated to 60 °C.
Without reheating.
Draw-off rate
Available water volume
Water with t = 45 °C (mixed temperature)
750 l
1000 l
VIESMANN
78
(cont.)
= cold water inlet temperature
cyl
varies according to the cylinder storage
L
L
L
.
L
.
L
l/min
)
D
l
N
performance factor
L
)
D
l
Peak output
)
D
l
max. draw-off rate
750
2.00
2.25
2.50
2.75
3.00
750
190
200
210
220
230
750
19.0
20.0
21.0
22.0
23.0
10
255
331
VITOSOL
950
3.00
3.20
3.50
4.00
4.60
950
230
236
246
262
280
950
23.0
23.6
24.6
26.2
28.0
20
190
249
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