Viessmann VITOMAX 200-HS Operating And Service Instructions page 8

Operating information
Operating tips
Record all actual values in a test report.
These must be confirmed by the instal-
ler, the relevant expert and the system
operator.
We would recommend that you operate
the boiler constantly at the required oper-
ating pressure. The operation of the
boiler at pressure will still be beneficial,
even if no heat demand occurs for a lon-
ger period of time.
8
(cont.)
In systems comprising several boilers, of
which one is constantly used as standby
boiler, only change the operation over
after longer intervals, e.g. during the
annual inspection of the total system.