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Water hardness
The combination steam oven must be adjusted to the local water hardness level to
ensure that it works correctly and to ensure that descaling is carried out at the cor-
rect interval. The harder the water is, the more frequently the combination steam
oven needs to be descaled. Contact your local water supplier to find out the water
hardness in your area.
If you are using an on-site water softener, match the setting on the combination
steam oven to the value set on the water softener.
If you are using an on-site system to fully demineralise the water (e.g. a reverse os-
mosis system), the system must be set so the conductivity of the treated water is
at least 100 μS/cm. In the case of most water qualities, this can be achieved by
setting a water hardness of at least 3 °dH rather than fully demineralising the water.
The conductivity is required for the fill level detection in the steam generator. Match
the setting on the combination steam oven to the value set on the full demineral-
isation system.
If you are using bottled water, it must comply with the relevant national regulations for
drinking water quality. Do not use mineral water or carbonated water. Adjust the set-
ting on the combination steam oven depending on the calcium content. The calcium
content is specified on the label of the bottle in mg/l Ca
Water hardness
°dH
°fH
1
1.8
2
3.6
3
5.4
4
7.1
5
8.9
6
10.7
7
12.5
8
14.3
9
16.0
10
17.9
11
19.6
12
21.4
13
23.2
14
25.0
15
26.8
16
28.6
44
Calcium content
mg/l Ca
mmol/l
0.18
0.36
14
0.54
21
0.72
29
0.90
36
1.07
43
1.25
50
1.43
57
1.61
64
1.79
71
1.97
79
2.15
86
2.33
93
2.51
100
2.69
107
2.86
114
2+
or ppm (mg/l CaCO
Calcium carbon-
2+
ate content
ppm (mg/l CaCO
7
18
36
54
71
89
107
125
143
161
179
196
214
232
250
268
286
).
3
Setting on com-
bination steam
)
oven
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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