Siemens DE1821415: Technical data

9

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VI.

Startup/additional information

The device is compliant to IEC 61000-3-12.

First start-up  

Switch on the fuses.

■

Setting the temperature.

■

Starts rinsing: Open the warm water tap and allow water 

■

to flow for at least 1 minute (flow-rate at least 6 litres per 

minute). Only then (for safety reasons) will the appliance 

begin to heat.

Tip: 

Should the appliance not start because of a reduced 

flow-rate, remove the perlator, shower head or similar before 

start and repeat the process.

Remove the flow-rate limiter (see Fig. A) with low water 

■

pressure.

Explain the operation of the continuous-flow heater to 

■

the user.

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.

Technical data

DE 1113415

DE 1821415

DE 4151821

DE 2427415

DE 4152427

Rated output

[kW]

11.0

13.0

18

21

24

27

Rated voltage

[V]

400

400

400

Fuse protection

[A]

16 / 20

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]

6.0

7.1

9.9

11.6

13.2

13.9

12 °C to 60 °C

[l/min]

3.8

3.3

5.4

6.3

7.2

7.6

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]

55

55

55

Maximum mains impedance at connection 

point

[Ω]

≤ 0.244

≤ 0.244

≤ 0.244

* The pressure loss on the mixer must also be added

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.

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.

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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

Thermostatic premixer 

■

BZ 45T20

: for installation in the 

domestic plumbing when using preheated water

Operation with prewarmed water (solar heated)

The continuous-flow heater can only heat prewarmed water 

to a max. of 60 °C. If the cold water supply exceeds a tem-

perature of 55 °C, the water will not be warmed any further.

Important:

 The cold water supply temperature must not be 

higher than 55 °C! 

If the cold water supply exceeds a temperature of 60 °C, a 

circuit breaker will trigger and shut the appliance off. There-

fore, the residential plumbing must be equipped with a ther-

mostatic premixer (e. g. special accessory 

BZ 45T20

) that will 

limit the cold water supply temperature to a max. of 55 °C by 

appropriately mixing in cold water.

G

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