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15.3 Increasing the temperature
At 230 V / 400 V, the following water temperature increas-
es occur:
45,0
42,5
40,0
37,5
35,0
32,5
30,0
27,5
25,0
22,5
20,0
1,4
1,8
2,2
X Flow rate in l/min
Y Temperature increase in K
1 3.5 kW - 230 V
2 4.4 kW - 230 V
3 5.7 kW - 230 V
4 6.5 kW - 400 V
Example MTD 350 with 3.5 kW
Flow rate
Increasing the temperature
Cold water supply temperature
Maximum possible outlet temperature
2,6
3,0
3,4
l/min
K
°C
°C
Note
An outlet temperature of 50 °C can be achieved with
the lowest possible flow rate and the following cold
water inlet temperatures:
4
º MTD 350 > 18 °C
º MTD 440 > 21 °C
3
º MTD 570 > 22 °C
º MTD 650 > 15 °C
2
1
15.4 Application areas
For the specific electrical resistance and
specific electrical conductivity, see "Data
table".
Standard specifica-
tion at 15 °C
Spec.
Spec. conduc-
resist-
tivity σ ≤
ance
ρ ≥
Ωcm mS/m μS/cm
1100
91
909
2.0
25
12
37
Installation - for contractors
20 °C
25 °C
Spec.
Spec. conduc-
Spec.
resist-
tivity σ ≤
resist-
ance
ance
ρ ≥
ρ ≥
Ωcm mS/m μS/cm
Ωcm mS/m μS/cm
970
103
1031
895
Spec. conduc-
tivity σ ≤
112
1117
39
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