Separate Dhw Cylinders; Sizing Cylinders - Viessmann VITODENS 300-W Technical Manual

Design information
(cont.)
Selection table
DHW demand, con- DHW demand for an apartment
venience
DHW demand for a detached house
DHW demand for a centralised system in an apart-
ment building
DHW demand for a decentralised system in an apart-
ment building
Usage of the various One draw-off point
connected draw-off
Several draw-off points, no simultaneous utilisation
points
Several draw-off points, simultaneous utilisation
Distance between Up to 7 m (without DHW circulation pipe)
draw-off point and With DHW circulation pipe
boiler
Modernisation Existing DHW cylinder
Replacement of an existing combi boiler
Space requirement Limited space available (installation in recesses)
Sufficient space available (installation room)
Solar DHW heating Connection to a dual mode DHW cylinder
can be connected
Connection to the integral DHW cylinder
+ = recommended
0 = recommended under certain conditions
– = not recommended

Separate DHW cylinders

For greater DHW convenience, separate DHW cylinders are also
available in white in the following versions:
■ Below the boiler (120 or 150 litres).
■ Adjacent to the boiler (160, 200, 300 or 400 litres).
Further DHW cylinders with up to 1000 litre capacity are offered in
Vitosilver and may also be used in accordance with the available heat-
ing output.

Sizing cylinders

Determine the DHW cylinder size in accordance with the specific DHW
demand.
Various consumer combinations may apply.
If identical consumers are combined, only take into account the indi-
vidual consumer, not the combination.
The following summary enables an approximate sizing of the DHW
cylinder:
Cylinder capacity in litres
Bath 1600
to DIN 4471
Draw-off rate in Wh
Draw-off volume per use or
available capacity in l
Bath 1600
to DIN 4471
Bath 1700
to DIN 4471
Small and stepped bath
Large bath
(1800 × 750 mm)
Shower cubicle with mixer
tap and standard shower
head
VITODENS
Bath 1700 Small and
to stepped
DIN 4471 bath
5820 6510 4890
140 160 120
120
120
120
120
120
120
120 120 120
120 120 120
Vitodens 200-W Vitodens 200-W
gas combi boiler and Vitodens 300-
with instantane- W gas boiler with
ous water heater separate DHW cyl-
inder
+ +
0 +
– +
+ +
+ 0
+ +
– +
+ +
– +
– +
+ –
+ 0
+ +
– +
– –
The Vitodens 200-W and 300-W boilers are equipped at factory with
a separate DHW cylinder for DHW heating. For this purpose, the
Vitodens 200-W and 300-W are provided with an integral diverter
valve.
To connect a separate DHW cylinder, always include the connection
set for the respective DHW cylinder in your order.
For DHW cylinder specifications, see chapter "DHW cylinders".
Small households (1 to 2 occupants)
Average households (3 to 4 occupants)
Note
Instead of a Vitodens 200-W or 300-W with 120 litre DHW cylinder, a
Vitodens 222-W can also be used.
Large bath Shower cu- Shower cu-
(1800 × bicle with bicle with 1
750 mm) mixer tap shower
and stand- head and 2
ard shower side noz-
head zles
8720 1630
200 40
120
120 150/160
120
120
120
120
120 120
200 150/160
120 120
150/160 120
Vitodens 222-W
with integral DHW
loading cylinder
+
+
–
0
0
+
+
+
–
–
0
0
+
–
–
Washbasin Bidet
4070 700 810
100 17 20
120 120 120
120 120
120 120 120
120 120 120
120 120 120
120 120 120
120 120 120
200 150/160 150/160
120 120 120
120 120 120
VIESMANN
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