STIEBEL ELTRON WWK 300 A Instruction Manual

OPERATION AND INSTALLATION
DHW HEAT PUMP
» WWK 300 A
» WWK 300 AH

2
Contents
1. Operating instructions for users
and contractors ____________________ 3
1.1 Operation and control�������������� 3
1.2 Device description ������������������ 3
1.3 Correct operation ������������������� 3
1.4 Incorrect operation ����������������� 3
1.5 Function description���������������� 3
1.6 Operation with active defrost fea-
ture
WWK 300 A and WWK 300 AH ���� 3
1.7 Maintenance and cleaning�������� 4
1.8 Troubleshooting by the user ������ 4
2. Installation instructions for con-
tractors _____________________________ 5
2.1 Regulations and standards�������� 5
2.2 Installation ��������������������������� 6
2.3 Water connection ������������������� 6
2.4 Power supply ������������������������ 8
2.5 Commissioning���������������������� 8
2.6 Safety equipment and mainte-
nance���������������������������������� 8
2.7 Specification ������������������������ 10
2.8 Operation with active defrost fea-
ture ����������������������������������� 11
2.9 Wiring diagrams ������������������� 12
2.10 Dimensions and connections ���� 14
Guarantee__________________________________15
Environment and Recycling ______________15
Note: Carefully read these
operating and installation
instructions and keep them safe. Should
the equipment change hands, pass these
instructions to the subsequent owner.
Pass them to the trained contractors for
servicing purposes.
Positioning, installation and commission-
ing must be carried out by trained per-
sonnel working in accordance with these
operating and installation instructions.
!
The appliance may be used by
children aged 8 and up and per-
sons with reduced physical, sensory or
mental capabilities or a lack of experi-
ence provided that they are supervised
or they have been instructed on how
to use the appliance safely and have
understood the resulting risks. Children
must never play with the appliance.
Children must never clean the appliance
or perform user maintenance unless
they are supervised.
Note: All measurements are given
in mm unless stated otherwise.
Standardised output data
Explanations to determine and interpret
the specified standardised output data
Standard: EN255-3
The output data specifically mentioned in
text, diagrams and technical datasheets
has been determined in line with the
test conditions described in the standard
shown in the heading of this chapter.
Generally, these standardised test condi-
tions will not fully meet the conditions
found at the installation site of the system
user. Depending on the chosen test meth-
od and the extent to which the selected
method deviates from the conditions
described in the standard shown in the
heading of this chapter, any deviations
can have a considerable impact. Further
factors that have an influence on the test
values are the measuring equipment, the
system configuration, the age of the sys-
tem and the flow rates.
A confirmation of the specified output
data can only be obtained if the condi-
tions applicable to the relevant test match
those of the standad shown in the head-
ing of this chapter.
Symbols used in these instructions
Observe the following safety instructions:
!
Please note: Warning about pos-
sible dangers.
Note: Important information and
tips.

3
1.1 Operation and control
The Stiebel Eltron domestic hot water
heat pump WWK300A/AH (DHW)
is a DHW generator that operates
automatically and has a capacity of
approx. 300l. The water temperature is
permanently set to 60°C.
The device is installed, connected and
handed over ready for use by a qualified
contractor. Nevertheless, you should
familiarise yourself with the most
important technical features of your heat
pump.
WARNING Burns
The water in the DHW cylinder
can be heated to temperatures in
excess of 60°C. There is a risk of
scalding at outlet temperatures
in excess of 43°C.
In Australia and New Zealand
the installation shall comply with
AS/NZS3500.4: This standard
requires mandatory use of a
suitable tempering device (eg.
tempering valve, thermostatic
mixing valve) for all installations
that supply hot water to sanitary
fixtures used primarily for per-
sonal hygiene.
1.2 Device description
The device extracts heat from the
ambient air. This energy is used to heat
the water inside the cylinder. Where the
device is installed inside a room, this is
cooled down through the heat extraction
by approx. 1 to 3°C. The device also
extracts moisture from the ambient air
that creates condensate, which must
be drained off. For this purpose, a
condensate drain is integrated into the
unit.
Special features of the WWK 300 AH
An electric booster heater is integrated for
heating approx. 100 litres of water in the
upper sector of the DHW cylinder.
1.3 Correct operation
The DHW heat pump is designed for
extracting heat from the ambient air and
the utilisation of that energy for heating
domestic hot water. The DHW heat pump
can be installed in the open as well as in
enclosed spaces.
The appliance is intended for domestic
use, i.e. it can be used safely by untrained
persons. The appliance can also be used
in a non-domestic environment, e.g. in a
small business, as long as it is used in the
same way.
1.4 Incorrect operation
The following are not permitted:
—The utilisation of greasy extract air.
—The heating of liquids other than
domestic hot water.
—The installation of the equipment:
a) in rooms where the temperature
is below the freezing point.
b) in rooms where the device is at
risk from explosions as a result
of dust, gases or vapours.
—Operation of the device with an empty
cylinder.
!
Always operate the unit with a full water tank, otherwise high
pressures will develop in the refrigera-
tion system, causing it to shut down. A
manual reset will be necessary after-
wards to restart the unit.
1.5 Function description
Heat pump operation
This is the standard operating mode,
to which the limits of scope of the heat
pump apply (see: Specification). To
heat up the cylinder capacity of approx.
300litres of water in accordance with
EN255 part 3 to 60 °C, the WWK300A
requires:
Heat-
up
time
[h]
Room
temper-
ature
[°C]
Rela-
tive
humid-
ity [%]
Cold
water
tempera-
ture [°C]
COP
WWK
300 A
10.1 15 70 15 3.19/3.3
5 42 70 15 5.61
τHeat-up ϑRoom Frel ϑCold water COP (t)
WWK 300 A
10.1 h 15 °C 70 % 15 °C 3.19/3.3
5 h 42 °C 70 % 15 °C 5.61
!
If the heat pump is switched OFF
and ON again, for instance after a
power failure, the compressor will only
re-start (after approx. 3 minutes), when
the pressure inside the refrigerant
circuit has normalised again.
Electric booster heater (only for the
WWK300AH)
If there is a higher DHW demand or
the WWK was switched OFF because
you require hot water quickly, you can
accelerate the heat-up process by means
of the electric booster heater. For reasons
of saving energy, the electric booster
heater will only heat up approx. 100litres
of water in the upper section of the
cylinder.
The control thermostat of the electric
booster heater is preset to 60°C and will
be restarted when the DHW temperature
falls below 45°C. This safeguards not only
that primarily the heat pump provides hot
water, but also that you enjoy a high level
of DHW convenience when large amounts
of hot water are drawn.
The red ON indicator illuminates when
the electric booster heater is switched on.
1
26�03�01�1610
1 Red indicator
1.6 Operation with active de-
frost feature
WWK 300 A and WWK 300 AH
Subject to the relative humidity and the
DHW temperature, the evaporator begins
to build up hoar frost at an ambient
temperature of below 6°C.
If the evaporator is covered in hoar
frost, the frost monitor N2 (see wiring
diagram) switches the fan OFF, whilst
the compressor continues to run, and
the changeover valveV2 routes the hot
gas directly to the evaporator. For this,
the condenser is shut off by changeover
valveV1 (see Fig.4). When the
temperature at the evaporator fins rises
above 3°C, the fan is started again, and
DHW heating continues.
The DHW heat pump can be operated at
ambient temperatures as low as 0°C.
The evaporator is defrosted according to
demand in the temperature range 0°C to
+6°C. This extends the heat-up time.
Ambient temperature
!The heat pump must not be
installed in areas where ambient
temperatures frequently exceed 42°C
or areas where temperatures frequently
drop below 0°C.
1. Operating instructions for users and contractors

4
1.7 Maintenance and cleaning
The device is generally maintenance free,
with the exception of cleaning the con-
densate drain and having an authorised
contractor check the sacrificial anode (as
outlined below).
A damp cloth is sufficient for cleaning
all plastic parts. Never use scouring or
solvent-based cleaning agents.
!
PLEASE NOTE: Maintenance work,
e.g. checking the electrical safety,
must only be carried out by a qualified
contractor.
zCheck at least monthly the condensate
drain at the middle of the unit (see
Fig. 1, number 13) and at the top the
condensate pan drain (visual check,
see Fig.3, pos.15). Remove contami-
nants and blockages immediately.
zFor the WWK300AH, it is recommen-
ded that the electric booster heater be
descaled from time to time. This will
result in prolonged life fo the electric
booster.
zYour local contractor, who is familiar
with the local water quality, should
identify for you the timing of the next
service.
zAsk your local contractor to regularly
check the safety assembly and the
electric booster heater.
zThe device is subject to mains water
pressure. The expansion water drips
from the safety valve during heat-up.
Inform your local contractor of water
drips from the system after the he-
at-up process has ended.
!
PLEASE NOTE: The sacrificial
anode must be checked by a
qualified contractor 12 months after
the unit has been installed and checked
periodically thereafter as advised by
the qualified contractor. Failure to do so
may void your warranty.
zTo protect the steel cylinder against
corrosion, the interior is coated with
a special enamel and is furthermore
equipped with a protective anode.
Ask your local contractor to check the
protective anode 12 months after in-
stallation and periodically thereafter
as advised by your local contractor. A
sacrificial anode maintenance log is
located at the end of this manual for
your local contractor to fill in.
1.8 Troubleshooting by the user
No hot water
Should you fail to obtain hot water at any
time, you can take the following steps to
remedy that situation.
No electrical power
Check the fuse/circuit breaker in your fuse
box. If it has blown/tripped, replace/reset
the fuse/MCB. If it should blow/trigger
repeatedly, notify your local contractor.
Still no hot water, even though power is
available
Check, whether the air inlet/outlet is
blocked.
The thermoswitch trips out or the high
limit safety pressure limiter switches
the compressor OFF if the compressor
is overloaded due to excessive ambient
temperature or excessive air temperature
(>42°C), or because of a fault in the
refrigerant circuit. Ask your local
contractor to remove the fault.
After a short cooldown phase, the
thermoswitch will restart the compressor
automatically.
!The high limit safety pressure
limiter must only be reset by your
contractor after he has removed the
cause of the relevant fault.
Other issues
Safety valve of the cold water supply line
drips
This may occur during the heat-up phase
and is completely normal.
The condensate drain drips
This always happens when the surface
temperature of the evaporator is lower
than the ambient dew point temperature.
For all other faults, consult your
contractor.

5
2.1 Regulations and standards
zThe installation (water and electrical
work) and commissioning, as well as
the maintenance of this equipment,
must only be carried out by an autho-
rised qualified contractor in accordan-
ce with these instructions.
zPerfect function and safe operation
can only be assured when using origi-
nal accessories and spare parts inten-
ded for this equipment.
zDIN VDE 0100 / DIN VDE 0701
zRegulations of your local electricity
supply utility.
zDIN 1988 / DIN 4109
zRegulations of your local water supply
utility.
2. Installation instructions for contractors
Also observe the following:
zThe equipment type plate
zThe specification
zWater installation
—Observe AS/NZS 3500.4 [local
regulations].
—Material of the cold water line:
Steel, copper or plastic pipe
systems.
—Material of the hot water line:
Copper or plastic pipe systems.
DHW
Cold Water
48°
30°
Fig. 1
1 Cold water supply G1
(G¾ female with adapter)
2 Hot water connection G1
(G¾ female with adapter)
3 Condensate drain G¾hose
connection (20mm male)
4 Connection for P&T relief valve G¾ (on-site)
5 Electrical cable (without plug)
6 Drain valve (on-site)
7 Expansion control valve (if required*, on-site)
8 Straight-through shut-off valve (on-site)
9 Pressure gauge test connector ** (on-site)
10 Non-return valve (on-site)
11 Test valve connection **
12 Pressure reducing valve (on-site)
13 Condensate spillover
26�03�13�0015
* Not all local regulations mandate the use of an
expansion control valve (ECV).
** Optional, depending on installation requiments
10 12
11
68
9
8
7
3
1
2
5
4
5
3
13

6
2.2 Installation
Transport
To protect the equipment against
damage, it must be transported vertically
inside its dedicated packaging. Where
space is restricted, you may also briefly
move the equipment tipped backwards at
an angle.
Positioning
—Position the device in the installation
location.
Note: Ensure that the casing
panel in the lower area of
the device is not damaged during
positioning.
—Remove packing straps and
polystyrene mouldings.
—Level the device by adjusting the
equipment feet.
—After leveling the device fix the nut of
the rubber feet to provide a maximum
of structural safety.
External installation
The location where the WWK is to be
installed must meet the following
conditions:
—Load-bearing floor (wet weight of the
WWK approx. 430kg).
—Never operate the WWK in rooms at a
risk from explosion due to dust, gases
or vapours.
—It is preferred that the location of
the unit is not near a bedroom or a
neighbour´s bedroom. Ideally a unit
may mounted near a kitchen or laun-
dry. Opposite a neighbours garage is
always prefferred.
—The water heater should be located
as close as possible to the most fre-
quently used hot water tap connec-
tion.
—Ensure that the data plate is clearly
visible.
—Ensure that the ambient temperature
lies within the application limits for
heat pump operation.
!
The heat pump must not be
installed in areas where ambient
temperatures frequently exceed 42°C
or areas where temperatures frequently
drop below 0°C.
Installation locations with aggressive air
(e.g. air loaded with ammonia, chlorine,
metals, oil, ...) are inadmissible because
they can cause damage to the device.
Where possible select an installation
location that has limited exposure to ex-
treme rain or snow.
Mount the unit so that it is not exposed to
direct strong wind, but is well ventilated.
The air inlet and outlet must be free. Pro-
tect your device with possibly a canopy, a
base and baffles to weather.
Internal installation
The room where the WWK is to be
installed must meet the following
conditions:
—Load-bearing floor (wet weight of the
WWK approx. 430kg).
—Never operate the WWK in rooms at a
risk from explosion due to dust, gases
or vapours.
—Include in your considerations the
utilisation of waste heat, for example
from a boiler, tumble drier or refrig-
erator/freezer.
—The available floor area in the instal-
lation room must be at least 6 m².
Never install this equipment in rooms
with a volume of less than 13 m³.
—Never restrict the clearances of the
WWK through walls and ceilings fur-
ther than illustrated in Fig.2.
!The heat pump must not be
installed in areas where ambient
temperatures frequently exceed 42°C
or areas where temperatures frequently
drop below 0°C.
Air Air
—In case of indoor installation and min.
installation room volume, the room
temperature might be reduced by ap-
prox. 1-3°C through the heat pump
operation. The initial temperature is
reached again approx. ½ h after the
heat pump has been switched OFF.
When installing the heat pump in a boiler
room, ensure that the boiler operation
will not be impaired.
Do not place the device near high fre-
quency machines.
2.3 Water connection
—Remove the protective caps from the
connectors.
—With a sharp knife, cut a hole into the
protective caps and invert over the
pipe to be connected.
—Connect the pipe and refit the
protective caps.
!Please note: To protect against
the risk of corrosion, make the
connection as flat packing seal. The use
of hemp, teflon, or thread seal tape on
connections is not acceptable.
26�03�01�1619�
3
12
1 Condensate drain
2 Hot water connection
3 Condensate spillover
≥ 400
≥ 400
≥ 400
≥ 100
670
Fig. 2
Positioning
26�03�01�1618

7
Insulate the DHW line in accordance with
local regulations.
Accurately maintain the order of fittings
on the cold water side (see Fig.1).
Flush the line prior to installation.
Install a drain valve at the lowest point
of the cold water supply inlet for future
maintenance of the tank.
Install a 700kPa pressure and tempera-
ture relief valve (PTRV) (Fig.1, pos.4).
Observe the requirements for expansion
control valve (ECV) (Fig.1, pos.7). In such
case, use a 550kPa valve.
A pressure reduction valve (PRV) must
be fitted (Fig.1, pos12) and adjusted to
a maximum of 500 kPa. If the ECV is re-
quired, set PRV to a maximum of 420kPa.
Please observe the following:
—Supply and drain pipe sizes should be
equal to safety valve sizes.
—Size the drain so that water can drain
off, even if the safety valve has been
fully opened.
—The drain outlet must not be able to
be closed and must always remain
open to atmosphere.
1 Capacitor
2 Electrical cable
3 Strain relief
4 Power terminals
5 Frost monitor
6 Heat pump control thermostat
7 Ventilator
8 Heat pump terminal
9 Control thermostat, electric booster heater, not shown,
points at place (only for the WWK 300 AH)
10 High limit safety cut-out Electric booster heater
(only for the WWK 300 AH)
11 Electric booster heater (only for the WWK 300 AH)
12 Protective anode (maintenance required)
13 Solenoid valve V1
14 Safety high pressure limit
15 Condensate pan drain (maintenance required)
16 Compressor
17 Motor circuit switch
18 Solenoid valve V2
26�03�01�1403
11
10
4
6
3
1
18
17
16
14
13 12
8
7
15
9
5
2
WWK 300 A/WWK 300 AH:
Fig. 3
Condensate drain
The device is designed so that, if it is in-
stalled externally, the condensate through
a suitable drain hose can freely drain
away. However, the condensate can also
(in case of internal installation or local
regulations) be routed away, to a garden
bed, a drain in the floor or a wall drain.
Note: Never kink the hose, to
ensure the condensate drains
perfectly.
If required install a condensate pump.

8
2.4 Power supply
Only qualified electricians must carry out
the installation in accordance with these
instructions.
!
Please note: Before any work,
isolate the equipment from the
power supply at the control panel.
Observe VDE 0100 [or local regulations]
and the regulations of your local power
supply utility.
The appliance is intended to be
permanently connected to fixed wiring.
For the connection to the power supply
the fitted supply cord has to be used.
(Fig.3, pos.2)
The DHW heat pump must be able to
be separated from the mains power
supply by an additional isolator, which
disconnects all poles with at least 3mm
contact separation. For this purpose, use
contactors, mains isolators, fuses, etc. on
site.
Terminals are located inside the control
panel and become accessible by removing
the equipment lid and the cover of the
wiring chamber).
2.5 Commissioning
Only approved contractors may
commission this equipment and instruct
the owner in its use.
Commissioning
—Fill, vent and thoroughly flush the
device.
—Check the safety assembly.
Inform the user that water may drip
from the safety valve whilst the water
is being heated up.
—Switch ON the power supply
Note:
—Never operate the equipment outside
the temperature range 0°C to + 42°C.
At temperatures below - 10°C (e.g. trans-
port/storage), the safety temperature cut-
out may respond. Press the reset button
after the temperature is much higher than
-10°C (Fig. 3, pos. 10).
2.6 Safety equipment and main-
tenance
Only qualified contractors must carry out
the installation in accordance with these
instructions.
On the equipment
In case of a fault, the safety equipment
of the WWK 300 interrupts the relevant
power circuit.
!
Please note: Before any work on
the equipment, disconnect all
poles from the mains.
High limit safety cut-out (STB) electric
booster heater
Equipment with electric booster heater
is stopped if the DHW temperature
exceeds95°C.
When the source of the fault has been
removed, reset the high limit safety cut-
out by pressing the reset button (Fig. 3,
pos.10). The heat pump top cover should
be opened for access to this device as
shown in Fig.3.
Safety high pressure limiter (SDBK)
The safety high pressure limiter shuts
down the compressor, if the pressure
inside the refrigerant circuit exceeds the
permissible maximum value. The safety
high pressure limiter may also respond,
if the appliance is operated above its
permissible limit (>42°C air temperature)
or the control thermostat of the heat
pump fails to respond. Reset the high
pressure limit safety cut-out by pressing
the reset button (Fig.3, pos.14), after the
cause of the fault has been removed.
Protective motor thermoswitch
The protective motor switch will shut
down the compressor, if it is overloaded
because of excessive thermal load.
Remove the relevant fault. After a
short cool-down phase, the protective
motor switch restarts the compressor
automatically.

9
Protective anode
!
PLEASE NOTE: The sacrificial
anode must be checked by a
qualified contractor 12months after
the unit has been installed and checked
periodically thereafter as advised by
the qualified contractor. Failure to do so
may void your warranty.
An anode for the protection of the
DHWcylinder is inserted centrally from
the top into the DHW ccylinder of the
appliance (Fig.3, pos. 12). The anode
fitted at the factory (anode rod) is
approximately 1.26 m long.
Replace the anode with a new one if the
installed one has been consumed.
A cap over the anode terminal prevent the
ingress of water between the anode ter-
minal and the condensate pan. Remove
the cap if you need to remove the anode.
When installing the anode, ensure that
the metallic conductor connection is
correctly made. It’s recommended for
first anode inspection to happen one year
after installation.
Consult with your water specialist, or
contractor, for the optimum timing for
inspections thereafter. Should it be
impossible to insert a rod anode, you may
have a sectional anode installed instead.
In areas where total dissolved solids
(TDS) in the water is outside the range
40-400 mg/l, the magnesium alloy anode
supplied, M2, must be replaced. Use a
high potential, M1, anode if TDS<40
or an aluminium A5 alloy anode if
TDS>400, before installing the unit.
Push the cap back over the anode termi-
nal.
Cleaning the evaporator
Maintaining the full output of the
WWK300 requires an occasional
professional cleaning of the evaporator.
Clean the evaporator only with water
and a brush. Never use acidic or alkaline
cleaning solutions.
WARNING Injury risk
The evaporator has many
sharp-edged fins. When clean-
ing the evaporator, proceed
with caution and wear pro-
tective clothing, in particular
safety gloves.
Further information regarding the
equipment:
zDescaling (only if a booster heater is
installed)
—Close the shut-off valve in the cold
water supply to the tank.
—Draw water from the tank to
relieve the pressure inside the
appliance.
—Unscrew the booster heater flange.
To undo the flanged immersion
heater, you require a 1½“ pipe
wrench. The pipe wrench must be
hollow so it can be guided over the
connecting cables.
—Immerse scaled sections of the
heater rod into a descaling liquid
(for example citric acid), until the
limescale has dissolved from the
heater rod.
—Flush the descaling liquid off and
allow the immersion heater to dry.
zDraining the cylinder:
—Close the shut-off valve in the cold
water supply.
—Fully open the hot taps at all draw-
off points.
—The cylinder is drained via the
cold water inlet line. Open the
drain valve (fig. 1, pos. 6). If no
drain valve was installed, undo the
fitting on the cold water supply
of the appliance. Residual water
remains in the lower part of the
cylinder.
Note: Hot water can be expelled
during draining.
On the system
Safety valve (on-site)
This valve opens when the water pressure
exceeds the preset value of 0.7MPa
(7 bar) thereby relieving the pressure. It is
adjusted so that no water will be expelled
when heating is switched OFF. Should it
continue to drip excessively, either the
valve seat has become contaminated, the
water pressure is too high or the pressure
reducing valve has become faulty.
Pressure reducing valve (on-site provi-
sion)
Check the valve for perfect function.
Replace it, if required.
Regular valve maintenance
Safety requires that valves are regularly
checked for perfect function. For this,
regularly vent the safety valve until a full
stream of water flows from it. Close the
safety valve after checking.
How quickly limescale builds up depends
on the local water quality.
As your local contractor is familiar
with your local water quality, let him
determine the timing of this check.
!
WARNING If the hot water unit is not used
for two or more weeks, an amount of
highly flammable hydrogen gas may
accumulate in the water tank. To dissi-
pate this gas safely, it is recommended
that a hot tap be turned on for several
minutes or until discharge of gas ceas-
es. Use a sink, basin or bath outlet, but
not a dishwasher, clothes washer or
other appliance. During this procedure,
there must be no smoking, open flame
or any electrical appliance operat-
ing nearby. If hydrogen is discharged
through the tap, it will probably make
an unusual sound as with air escaping.

10
2.7 Specification
WWK 300 AH WWK 300 A
227070 222422
Power consumption
Power consumption at A15/W15-55 kW 0,5 0,5
Power consumption, emergency/booster heater kW 1,69
Coefficient of performance (COP)
Coefficient of performance at A15/W15-55 3,4 3,4
COPs to EN 255
Coefficient of performance to EN 255 3,19 3,19
Output data
Heating output at A15/W15-55 kW 1,7 1,7
Sound data
Sound pressure level at 1 m distance in a free field dB(A) 56 56
Sound power level (EN 12102) dB(A) 64 64
Application limits
Min. installation room floor area m² 6 6
Min. installation room volume m³ 13 13
Hydraulic data
Rated capacity l 300 300
Energy data
Standby energy consumption/24 h at 65 °C kWh 1,14 1,14
Electrical details
Fuses AC 16 C 16
Rated voltage V 240 240
Phases 1/N/PE 1/N/PE
Frequency Hz 50 50
Rated current A 2,5 2,5
Power consumption W 2250 700
Max. power consumption W 2250 700
Versions
IP-Rating IP24 IP24
Refrigerant R134a R134a
Refrigerant capacity kg 0,9 0,9
Dimensions
Height of unit when tilted mm 1990 1990
Height when tilted incl. packaging mm 2200 2200
Height mm 1870 1870
Diameter mm 670 670
Weights
Weight (dry) kg 125 125
Connections
Condensate drain mm 20 20
Water connection G 1 (with adaptor Rp 3/4 female) G 1 (with adaptor Rp 3/4 female)
Values
Air flow rate m³/h 550 550
Lower air temperature limit °C 0 0
Upper air temperature limit °C 42 42
The output data refers to new appliances
with clean heat exchangers.

11
2.8 Operation with active de-
frost feature
1
2
PC
P0
>P
TC
VL
TKW
TWW
V1 V2 V1
1
2
PC
P0
>P
TC
TKW
TWW
V2
Heating operation Defrost operation
26�03�01�0755
26�03�01�0754
Fig. 4

12
2.9 Wiring diagrams
2.9.1 WWK 300 A
N L
14 13 11 10 9 8 7 65 4 3 2 1
M1
M
1~
C
RS
F2
1
3
bn
bk bu
-7°C/+3°C
>
T<
C1 4
3
2
1
3
42
N2
X2
M2
M
1~
bu
bn
bubn
p
F3
T<
42
1
N0
X1
X0
2
1
<
V2
V1
L
N
PE
bn
bu gnye
gnye
Z1X3
D0000049791
C1 Operating capacitor
F2 Motor circuit switch
F3 Pressure limiter refrigerant circuit
M1 Compressor
M2 Fan
N0 Thermostat heat pump
N2 Hoar frost temperature monitor
V1 Solenoid valve
V2 Solenoid valve
X0 Terminal mains
X1 Terminal heat pump
X2 Ground compressor device
X3 Ground radio interference filter
Z1 Radio interference filter

13
2.9.2 WWK 300 AH
N L
14 13 11 10 9 8 7 65 4 3 2 1
M1
M
1~
C
RS
F2
1
3
bn
bk bu
-7°C/+3°C
>
T<
C1 4
3
2
1
3
42
N2
X2
M2
M
1~
bubn
bubn
p
F3
T<
42
1
N0
X3
E1 F1
1,55kW
12
22
32
11
21
31
12
22
32
11
21
31
T>
X4
X1
X0
2
1
N1
T
<
H1
A1
A3
V2
V1
L
N
PE
bn
bu gnye
gnye
Z1X5
D0000049798
C1 Capacitor
E1 Electric heating element (booster heater)
F1 Temperature limiter electric heating element (booster
heater)
F2 Motor circuit switch
F3 Pressure limiter refrigerant circuit
H1 Signallamp electric booster heater
M1 Compressor
M2 Fan
N0 Thermostat heat pump
N1 Thermostat electric heating element (booster heater)
N2 Hoar frost temperature monitor
V1 Solenoid valve
V2 Solenoid valve
X0 Terminal mains
X1 Terminal heat pump
X2 Ground compressor device
X3 Ground electric heating element
X4 Ground coat
X5 Ground radio interference filter
Z1 Radio interference filter

14
2.10 Dimensions and connections
1840
30-60
670
1638
185
1267
b01 g02
g01
c01
c06
c13
d45 d43
30°
12°
16°
D0000018053
WWK 300 AH WWK 300 A
b01 Entry electrical cables
c01 Cold water inlet Male thread G 1 G 1
c06 DHW outlet Male thread G 1 G 1
c13 T&P valve Female thread G 3/4 G 3/4
d43 Condensate overflow
d45 Condensate drain Male thread G 3/4 G 3/4
g01 Air intake
g02 Air discharge
Accessories
Type Part Number Description
PK10 229286 Condensate pump

15
Guarantee
The guarantee conditions of our German companies do not
apply to appliances acquired outside of Germany. In countries
where our subsidiaries sell our products a guarantee can only
be issued by those subsidiaries. Such guarantee is only grant-
ed if the subsidiary has issued its own terms of guarantee. No
other guarantee will be granted.
We shall not provide any guarantee for appliances acquired in
countries where we have no subsidiary to sell our products.
This will not aect warranties issued by any importers.
Environment and recycling
We would ask you to help protect the environment. After use,
dispose of the various materials in accordance with national
regulations.
KYOTO | R134a
This device is filled with refrigerant R134a.
Refrigerant R134a is a CFC greenhouse gas mentioned in the Kyoto
protocol with a global greenhouse potential (GWP) = 1300.
Never release refrigerant R134a to atmosphere.
Guarantee Environment and Recycling

16
Warranty Stiebel Eltron Australia Only - According to national
regulations in Australia
Warranty for Heat Pumps – Models WWK 300A and WWK 300AH
Who gives the warranty
1. The warranty is given by Stiebel Eltron (Aust) Pty Ltd
(A.B.N.82066271083) of 6 Prohasky Street, Port Mel-
bourne, Victoria, 3207 (“we”, “us” or “our”).
The warranty
2. This warranty applies to Stiebel Eltron Heat Pumps – Mod-
els WWK 300A and WWK 300AH (the “unit”) manufactured
after 1 May 2015.
3. Subject to the warranty exclusions we will repair or re-
place, at our absolute discretion, a faulty component in
your unit free of charge if it fails to operate in accordance
with its specifications during the warranty period.
4. If we repair or replace a faulty component to your unit
under this warranty, the warranty period is not extended
from the time of the repair or replacement.
5. The warranty period commences on the date of completion
of the installation of the unit. Where the date of completion
of installation is not known, then the warranty period will
commence 2 months after the date of manufacture.
6. The warranty period for a unit used for domestic purposes
is shown in the table below. Domestic purposes means that
the unit is used in a domestic dwelling.
Component Warranty period
Cylinder and condenser 5 years from the date of
completion of the installa-
tion of the unit.
Sealed refrigeration sys-
tem, including compressor,
evaporator, valves and as-
sociated pipe work
2 years from the date of
completion of the installa-
tion of the unit.
All other componentry
(electrical)
1 year from the date of
completion of the installa-
tion of the unit.
7. The warranty period for a unit used for commercial pur-
poses is shown in the table below. Commercial purposes
means that the unit is used for a non-domestic purpose
and includes but not limited to being used in a motel,
hotel, mining camp or nursing home.
Component Warranty period
Cylinder and condenser 2 years from the date of
completion of the installa-
tion of the unit.
Sealed refrigeration sys-
tem, including compressor,
evaporator, valves and as-
sociated pipe work
2 years from the date of
completion of the installa-
tion of the unit.
All other componentry
(electrical)
2 years from the date of
completion of the installa-
tion of the unit.
Your entitlement to make a warranty claim
8. You are entitled to make a warranty claim if:
8.1. you own the unit or if you have the owner’s consent to rep-
resent the owner of the unit;
8.2. you contact us within a reasonable time of discovering the
problem with the unit;
How you make a warranty claim
9. To make a warranty claim you must provide us with the fol-
lowing information:
9.1. The model number of the unit;
9.2. A description of the problem with the unit;
9.3. The name, address and contact details (such as phone
number and e-mail address) of the owner;
9.4. The address where the unit is installed and the location
(e.g. at side of house);
9.5. The serial number of the unit;
9.6. The date of purchase of the unit and the name of the seller
of the unit;
9.7. The date of installation of the unit;
9.8. A copy of the certificate of compliance when the unit was
installed.
10. The contact details for you to make your warranty claim
are:
Name: Stiebel Eltron (Aust) Pty Ltd
Address: 6 Prohasky Street, Port Melbourne,
Victoria, 3207
Telephone: [phone] (8.00am to 5.00pm AEST
Monday to Friday)
Contact person: Customer Service Representative
E-mail: servic[email protected]om.au
11. We will arrange a suitable time with you to inspect and test
the unit.
Warranty exclusions
12. We may reject your warranty claim if:
12.1. The unit was not installed by a registered and qualified
plumber.
12.2. The unit was not installed and commissioned:
a) in Australia;
b) in accordance with the Operating and Installation
Guide; and
c) in accordance with the relevant statutory and local re-
quirements of the State or Territory in which the unit is
installed.
12.3. The unit has not been operated or maintained in accord-
ance with the Operating and Installation Guide.
12.4. The unit does not bear its original Serial Number or Rating
Label.

17
12.5. The unit was damaged by any or any combination of the
following:
a) normal fair wear and tear;
b) connection to an incorrect water supply, for exam-
ple where the water is highly conductive; where the
water has a mineral content with a TDS > 2500 mg/L;
or where the Langelier Saturation Index (LSI) of the
water is outside the range -1.0<LSI <0.8 (The LSI is a
numeric value indicating whether water is scale form-
ing or corrosive. It factors in pH, total alkalinity, calcium
hardness and water temperature);
c) connection to water from a bore, dam or swimming
pool;
d) connection to an incorrect power supply;
e) connection to faulty equipment, such as damaged
valves;
f) insufficient air flow;
g) foreign matter in the water supply, such as sludge or
sediment;
h) corrosive elements in the water supply;
i) inappropriate anode or replacement regime used;
j) accidental damage;
k) act of God, including damage by flood, storm, fire,
lightning strike and the like;
l) excessive water pressure, negative water pressure (par-
tial vacuum) or water pressure pulsation.
12.6. The unit was damaged before it was installed e.g. it was
damaged in transit.
12.7. An unauthorised person has modified, serviced, repaired or
attempted to repair the unit without our consent.
12.8. Non genuine parts other than those manufactured or ap-
proved by us have been used on the unit.
13. We may charge you:
13.1. for any additional transport costs if the unit is installed
more than 30 kilometres from our closest authorised ser-
vice technician.
13.2. for the extra time it takes our authorised service technician
to access the unit for inspection and testing if it is not sited
in accordance with the Operating and Installation Guide
and not readily accessible for inspection.
13.3. for any extra costs of our authorised service technician to
make the unit safe for inspection.
14. You must ensure that access to the unit by our authorised
service technician is safe and free from obstruction.
15. Our authorised service technician may refuse to inspect and
test the unit until you provide safe and free access to it, at
your cost.
16. If we reject your warranty claim in accordance with clause
12, we may charge you for our authorised service techni-
cian’s labour costs to inspect and test the unit.
17. In order to properly test the unit we may remove it to an-
other location for testing.
Australian Consumer Law
18. Our goods come with guarantees that cannot be excluded
under the Australian Consumer Law. You are entitled to a
replacement or refund for a major failure and compensa-
tion for any other reasonably foreseeable loss or damage.
You are also entitled to have the goods repaired or replaced
if the goods fail to be of acceptable quality and the failure
does not amount to a major failure.
19. The Stiebel Eltron warranty for the unit is in addition to any
rights and remedies you may have under the Australian
Consumer Law.
ENVIRONMENT AND RECYCLING
Please help us to protect the environment by disposing of the
packaging in accordance with the national regulations for waste
processing.

18
Sacrificial anode maintenance log
!
PLEASE NOTE: The sacrificial
anode must be checked by a
qualified contractor 12 months after
the unit has been installed and checked
periodically thereafter as advised by
the qualified contractor. Failure to do so
may void your warranty.
Date unit was installed
12 month sacrificial
anode review date
Completed
(yes/no)?
Was the anode replaced
(yes/no)?
Name of the qualified contractor
Next scheduled sacrificial
anode review date
Completed
(yes/no)?
Was the anode replaced
(yes/no)?
Name of the qualified contractor

19



Deutschland
STIEBEL ELTRON GmbH & Co. KG
Dr.-Stiebel-Straße 33 | 37603 Holzminden
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.de
Verkauf Tel. [phone] | Fax [phone] | info-[email protected]
Kundendienst Tel. [phone] | Fax [phone] | kund[email protected]
Ersatzteilverkauf Tel. [phone] | Fax [phone] | [e-mail]
Irrtum und technische Änderungen vorbehalten! | Subject to errors and technical changes! | Sous réserve
d‘erreurs et de modifications techniques! | Onder voorbehoud van ver
g
issin
g
en en technische wi
j
zi
g
in
g
en! |
Salvo error o modificación técnica! | Excepto erro ou alteração técnica | Zastrzeżone zmian
y
techniczne i
ewentualne błędy | Omyly a technické změny jsou vyhrazeny! | A muszaki változtatások és tévedések
j
o
g
át
fenntartjuk! | Отсутствие ошибок не гарантируется. Возможны технические изменения. | Ch
y
b
y
a
technické zmeny sú vyhradené! Stand 9046
Australia
STIEBEL ELTRON Australia Pty. Ltd.
6 Prohasky Street | Port Melbourne VIC 3207
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel.com.au
Austria
STIEBEL ELTRON Ges.m.b.H.
Eferdinger Str. 73 | 4600 Wels
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.at
Belgium
STIEBEL ELTRON bvba/sprl
't Hofveld 6 - D1 | 1702 Groot-Bijgaarden
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.be
China
STIEBEL ELTRON (Guangzhou) Electric
Appliance Co., Ltd.
Rm 102, F1, Yingbin-Yihao Mansion, No. 1
Yingbin Road
Panyu District | 511431 Guangzhou
Tel. [phone] | Fax [phone]
[e-mail]
www.stiebeleltron.cn
Czech Republic
STIEBEL ELTRON spol. s r.o.
K Hájům 946 | 155 00 Praha 5 - Stodůlky
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.cz
Finland
STIEBEL ELTRON OY
Kapinakuja 1 | 04600 Mäntsälä
Tel. [phone]
[email protected]
www.stiebel-eltron.fi
France
STIEBEL ELTRON SAS
7-9, rue des Selliers
B.P 85107 | 57073 Metz-Cédex 3
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.fr
Hungary
STIEBEL ELTRON Kft.
Gyár u. 2 | 2040 Budaörs
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.hu
Japan
NIHON STIEBEL Co. Ltd.
Kowa Kawasaki Nishiguchi Building 8F
66-2 Horikawa-Cho
Saiwai-Ku | 212-0013 Kawasaki
Tel. [phone] | Fax [phone]
[email protected]
www.nihonstiebel.co.jp
Netherlands
STIEBEL ELTRON Nederland B.V.
Daviottenweg 36 | 5222 BH 's-Hertogenbosch
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.nl
Poland
STIEBEL ELTRON Polska Sp. z O.O.
ul. Działkowa 2 | 02-234 Warszawa
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.pl
Russia
STIEBEL ELTRON LLC RUSSIA
Urzhumskaya street 4,
building 2 | 129343 Moscow
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.ru
Slovakia
TATRAMAT - ohrievače vody s.r.o.
Hlavná 1 | 058 01 Poprad
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.sk
Switzerland
STIEBEL ELTRON AG
Industrie West
Gass 8 | 5242 Lupfig
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.ch
Thailand
STIEBEL ELTRON Asia Ltd.
469 Moo 2 Tambol Klong-Jik
Amphur Bangpa-In | 13160 Ayutthaya
Tel. [phone] | Fax [phone]
[e-mail]
www.stiebeleltronasia.com
United Kingdom and Ireland
STIEBEL ELTRON UK Ltd.
Unit 12 Stadium Court
Stadium Road | CH62 3RP Bromborough
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron.co.uk
United States of America
STIEBEL ELTRON, Inc.
17 West Street | 01088 West Hatfield MA
Tel. [phone] | Fax [phone]
[email protected]
www.stiebel-eltron-usa.com
A 280010-38800-9055
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