9
EN
Technical data
DE2UF18 DE2UF21 DE2UF24
Rated output
[kW] 18 21 24
Rated voltage
[V] 400 400 400
Fuse protection
[A] 32 32 40
Minimum conductor cross-section
[mm
2
]4 4 6
Warm water flow at rated output
with temperature increase from
12 °C to 38 °C [l/min] 9.9 11.6 13.6
12 °C to 60 °C [l/min] 5.4 6.3 7.2
Start-up flow
[l/min] 2.6 2.6 2.6
Start-up flow pressure *
[MPa (bar)] 0.025 (0.25) 0.025 (0.25) 0.025 (0.25)
Application area in water specific electric
resistance at 15 °C
[Ωcm] ≥ 1 300 ≥ 1 300 ≥ 1 300
Rated pressure
[MPa (bar)] 1.0 (10.0) 1.0 (10.0) 1.0 (10.0)
Maximum permissible supply temperature
[°C] 20 20 20
Maximum mains impedance at connection point
[Ω] ≤ 0.400 ≤ 0.400 ≤ 0.400
* The pressure loss on the mixer must also be added.
A
If the continuous-flow heater does not have sufficient
water flow due to low water line pressure in your do-
mestic plumbing system, remove the flow-rate
limiter.
B
Priority circuit for the combination with electrical
storage heaters:
For operation with a priority circuit, a special load
shedding relay BZ 45L20 (special accessory) is re-
quired. Other existing load shedding relays, with the
exception of electronic load shedding relays, may
malfunction.
C
The control electronics must be coded when operated
with a load shedding relay.
Special accessories
Pipe kit ■ BZ 45U20: for use of the continuous-flow heater
as an under sink appliance
Priority switch (load shedding relay)
■ BZ 45L20:
for operation with a priority circuit
Mounting kit
■ BZ 45K23: for surface mount installation
D
Status display on the appliance
LED Appliance status
Off Off
Lights up Ready
Slow flash (1/s) Appliance is heating
Fast flash (4/s) Desired water temperature is not
reached (water flow too high for
appliance rating).
E
The filter upstream from the check valve in the cold
water supply inlet is clogged.
Remove the filter and either clean it or descale it.
See Figure E 1–3.
472
236
20
100
332
42
388
124
137
G
1
2
A
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