Additional Information; Standard Values For Water Quality - Viessmann Vitomax 200-HW Operating And Service Instructions

Additional information

Standard values for water quality

According to the EN 12953 part 10
and the VdTÜV datasheet 1466
regarding the water quality for hot
water boilers in heating systems, the
following details apply to heating sys-
tems operated with flow temperatures
in excess of 100 °C:
Operation with circulating water with low salt content
Only use water with a low salt content
as fill or top-up water, such as desali-
nated water, permeate or condensate.
Operation with saline water
Where possible, use water with a low
salt content that is at least free from
alkaline earths (softened) as fill or
top-up water.
El. conductivity at 25 °C
General requirements
pH value at 25 ºC
pH value according to the
Drinking Water Order/
Drinking Water Treat-
ment Order [or local reg-
ulations]
Oxygen (O )
2
(values for constant op-
eration are generally sig-
nificantly lower)
*1
The oxygen concentration in the re-circulated water may be up to 0.1 mg/litre, if suitable
inorganic corrosion inhibitors are used.
20
Systems using mixed condensate
generally create water with low salt
content if no boiler water is fed into
the system for putrefaction by alka-
lies.
with low salt content
μS/cm 10 to 30
Clear, with-
out sedi-
ments
9 - 10
≤ 9.5
mg/ < 0.1
litre
saline
> 30 to 100 > 100 to 1
500
Clear, with- Clear, without
out sedi- sediments
ments
9 - 10.5 9 - 10.5
≤ 9.5 ≤ 9.5
< 0.05
< 0.02 * 1