Type CVW
Connections
Heating water flow and return (male thread) R 1¼
Cold water, DHW (male thread) R 1¼
Solar heat exchanger set (male thread) R ¾
DHW circulation (male thread) R 1
Immersion heater (female thread) Rp 1½
Energy efficiency class B
Information regarding continuous output
When designing systems with the specified or calculated continuous
output, select a matching circulation pump. The stated continuous
output is achieved only if the rated boiler heating output is ≥ continu-
ous output.
107
455
349
399
591
849
969
1089
1458
422
1014
1522
1624
WW1
Z
HV
SPR1
WW2
SPR2
KW/E
ELH1
HR
ELH2/R
881
923
650
859
SPR2
E Drain
ELH1 Connector for immersion heater
ELH2 Flanged aperture for immersion heater
HR Heating water return
HV Heating water flow
KW Cold water
R Inspection and cleaning aperture with flange cover
SPR1 Sensor well for cylinder temperature sensor of cylinder tem-
perature controller (internal diameter 7 mm)
SPR2 Sensor well for temperature sensor of solar heat exchanger
set (internal diameter 16 mm)
WW1 DHW
WW2 DHW from solar heat exchanger set
Z DHW circulation
Performance factor N
L
■ According to DIN 4708, without return temperature limit
■ Cylinder storage temperature T
cyl
= cold water inlet temperature +
50 K
+5 K/–0 K
Performance factor N
L
at heating water flow
temperature
90 °C 16.5
80 °C 15.5
70 °C 12.0
Information on performance factor N
L
The performance factor N
L
depends on the cylinder storage temper-
ature T
cyl
.
Standard values
■ T
cyl
= 60 °C → 1.0 × N
L
■ T
cyl
= 55 °C → 0.75 × N
L
■ T
cyl
= 50 °C → 0.55 × N
L
■ T
cyl
= 45 °C → 0.3 × N
L
Peak output (over 10 minutes)
■ Relative to performance factor N
L
■ DHW heating from 10 to 45 °C without return temperature limit
Peak output (l/10 min) at a heating water flow
temperature of
90 °C 540
80 °C 521
70 °C 455
Max. draw-off rate (over 10 minutes)
■ Relative to performance factor N
L
■ With reheating
■ DHW heating from 10 to 45 °C
Max. draw-off rate (l/min) at heating water
flow temperature
90 °C 54
80 °C 52
70 °C 46
DHW cylinders
(cont.)
VITOSOL
VIESMANN
53
5822 440 GB
7
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