Viessmann VITODENS 100-W Installation And Service Instructions Manual page 12

Installation sequence
Fitting the boiler and making connections
Making the connections on the water side
A B C
¨
A Heating flow 7 22 mm
B DHW 7 15 mm
C Gas connection 7 22 mm
For installation of fittings on the
heating water side and DHW
side, see separate installation
instructions.
12
D E
(cont.)
D Cold water 7 15 mm
E Heating return 7 22 mm