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English
Technical specifications
Type DHE 18 DHE 21 DHE 24 DHE 27
Rated power kW 18 21 24 27
Pressure loss* bar / l/min 0,6 / 5,2 0,8 / 6,0 1,0 / 6,9 1,2 / 7,7
Rated overpressure bar 10
Weight kg 5
Rated capacity l 0,4
Design closed (pressurized)
Safety class 1
Protection mode IP 25
Approval of the German PA-IX 6006/ I
building control
Water connection (male thread) G 1/2
Type Designation as Application areas for various water analysis
reference temperatures*
Application areas for instantaneous water heaters relative to the specific
electrical conductivity / specific electrical resistance of the water
standardized
version
at 15 °C ** at 20 °C at 25 °C
DHE specific electrical ≥ 900 Ωcm ≥ 800 Ωcm ≥ 735 Ωcm
resistance
corresponding to
specific electrical ≤ 111 mS/m ≤ 125 mS/m ≤ 136 mS/m
conductivity ≤ 1110 µS/cm ≤ 1250 µS/cm ≤ 1360 µS/cm
* Note:
The values for the specific electrical resistance and the specific electrical conductivity are
determined at different temperatures in different regions. This must be borne in mind in
any evaluation.
** Application areas in solar mode (up to 55 °C) specific electrical resistance ≥ 1100 Ωcm.
Electrical connection 3/PE ~ 400 V
Free of system interference as per IEC 1000-3-5 (EDIN VDE 0838-5)
VDEW-license
Heating system Bare wire
Application area Including hard water areas in particular
Application areas specific electrical
resistance / conductivity see Table 3
Flow rate „on“ ≥ 3,0 l/min
Tab. 2
* Pressure loss figures also apply to the minimum flow pressure to DIN 44851/flow rate
for heating from 10 °C to 60 °C (∆ϑ 50 K). A pressure loss of 1 bar is recommended
for pipe network design, in line with DIN 1988, Part 3, Table 4.
Flow rate „off“ ≤ 2,0 l/min
Tab. 3
Mark of conformity see rating plate
Brief description
(for a qualified installer)
The DHE microcomputer-controlled, fully
electronic, instantaneous water heater is a
pressurized unit for heating cold water to
DIN 1988 or for further heating preheated
water up to 55 °C (solar mode).
The DHE’s maximum inlet temperature
must not exceed 60 °C (higher tempera-
tures on the display can damage
the unit).
Measures must be taken to ensure that
the inlet temperature of the DHE
does not exceed 60 °C
(e.g. by using special accessories, see
page 37).
One or more water taps may be supplied
by the unit.
If the selected outlet temperature cannot
be reached, because a fully open tap or
2nd tap requires more flow than the DHE
can heat, given its power rating, the flow
restriction valve - actuated by the micro-
computer - reduces the flow rate so that
the set temperature is always reached.
The specific electrical resistance of the
water must not be lower than
specified on the rating plate e.g.
Table 3!
If you have a combined water system, the
lowest electrical resistance of the water
should be used (see Tables 2 and 3). You
can obtain details of the specific electrical
resistance or the electrical conductivity of
the water from your water supply
company.
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