IH 21 Electronic Basic - Water Heaters and Kettles ELECTROLUX - Free user manual and instructions

Product Type	Instantaneous (tankless) water heater, unvented, pressurised
Model	IH 21 Electronic Basic
Brand	Electrolux
Dimensions (H x W x D)	469 x 226 x 99 mm
Weight	3.9 kg
Power Rating	21 kW
Electrical Connection	3 / PE ~ 380 V, three-phase AC
Water Connection	G 1/2 A (male thread)
Nominal Overpressure	1 MPa (10 bar)
Protection Class (VDE)	I (earthing required)
Protection Type (VDE)	IP 25 (splash-water protected)
Temperature Range	30 °C to 60 °C, continuously adjustable
Switch-on Flow Rate	Approx. 3 l/min
Switch-off Flow Rate	Approx. 2.5 l/min
Flow Rate Limitation (built-in)	9 l/min (at 40 °C outlet)
Hot Water Output (at 40 °C, 10 °C inlet)	10 l/min
Hot Water Output (at 55 °C, 10 °C inlet)	6.7 l/min
Minimum Specific Water Resistance	> 1100 Ω·cm at 15 °C
Maximum Inlet Temperature	25 °C
Heating System	Bare wire resistance heating with microprocessor control
Safety Devices	Safety temperature limiter (manual reset), flow sensor, electronic overheat protection
Suitable for Hard Water	Yes (low water content design)
Number of Tapping Points	One or more (for pressure fittings)
Maintenance	Clean strainer insert periodically; descale aerators/shower heads as needed; plastic housing with damp cloth

Frequently Asked Questions - IH 21 Electronic Basic ELECTROLUX

What is the power consumption of the Electrolux IH 21 Electronic Basic?

The IH 21 Electronic Basic has a nominal power of 21 kW at three-phase 380 V connection.

How do I set the desired hot water temperature?

Use the temperature selector knob to continuously adjust the outlet temperature between 30 °C and 60 °C. For energy saving, set to 40 °C for washbasin, shower, and bath (the knob has a tactile detent). For kitchen sink, use 55 °C.

What is the minimum flow rate for the heater to turn on?

The appliance switches on at a flow rate of approximately 3 l/min and switches off when the flow drops below 2.5 l/min. If the water flow is too low, the heater will not activate.

Can I use the water heater with a thermostatic mixer tap?

Yes, but the temperature setting on the instantaneous water heater should be set about 8 °C higher than on the thermostatic mixer tap to ensure correct regulation.

What should I do if the hot water temperature is not reaching the set value?

This may happen if the water flow is too high. Slightly close the hot water tap to reduce flow. Also check that the inlet temperature is not too high (max 25 °C) and that the strainer insert is clean. If the problem persists, contact a trained engineer.

How do I clean the strainer insert?

First shut off the cold water supply using the shutoff unit. Loosen the cap nut with a spanner, remove and clean the strainer, then reassemble. After cleaning, open the cold water supply and check for leaks.

What does the fault indicator LED mean?

The appliance has two LEDs that indicate faults. For example, if LED 1 flashes long and LED 2 is off, it may indicate a missing phase (L1 or L3). Refer to the fault-finding table in the manual (page 18) for specific patterns. After the fault is corrected, the memory resets automatically.

How can I limit the maximum temperature?

The maximum temperature can be mechanically limited to 40 °C or 45 °C by adjusting the temperature set-point pickup inside the appliance hood. This should be done by a trained engineer following the instructions on page 15 of the manual.

Is the water heater suitable for hard water?

Yes, the bare wire resistance heating system with very low water content is designed to be suitable for hard, lime-containing water. However, regular maintenance of faucet aerators and shower heads is still recommended.

What electrical connection is required?

The appliance requires a fixed three-phase 380 V (3/N/PE ~ 380 V) connection with a protective earth. The cable must have an insulated length of at least 20 mm projecting from the wall. Connection must be done by a qualified installer.

USER MANUAL IH 21 Electronic Basic ELECTROLUX

Instantaneous Water Heater

IH 18 electronic basic IH 21 electronic basic IH 24 electronic basic

Contents Page

Important instructions for the user 3

General 3

Operating the appliance 3

Temperature preselection 3

Hot water flowrate 4

Care and maintenance of the appliance 4

Important instructions for the installer 5

General 5

Appliance constitution 5

Technical data 6

Appliance function 7

Safety temperature limiter 7

Installing the appliance 8

Dimensioned diagram 8

Appliance installation 9

Hood dismounting 9

Wall mounting 9

Water connection 10

Concealed installation 10

Installation versions 11

Cleaning the strainer insert 12

Flowrate limiter 12

Electrical connection 13

Mains connection 13/14

Circuit diagram 14

Temperature selector range limitation 15

Hood assembly 15

Using the appliance for the first time and checking 16

Fault-finding 17

Fault indications 18

Important for the expert 19

Customer service 20

Important instructions for the user

General

• Installation and startup should only ever be performed by an approved installer or authorised installation firm.
• Before using the appliance, please read through these instructions carefully. The manufacturer cannot accept any liability for damage resulting from failure to follow these instructions.
• Fittings and connecting pipes may get hot. Therefore keep children well away.

Operating the appliance

The ELECTROLUX IH electronic instantaneous water heater heats the water as the latter continuously flows through it. When the hot water tap is opened, the appliance switches on at a flowrate of around 3 l/min. When the hot water valve is closed or if the flowrate is reduced below 2.5 l/min, the appliance switches itself off again. The appliance is suitable for household use and should only ever be used for heating of drinking water.

One or more tapping points can be supplied with hot water.

Temperature preselection

The electronic system allows continuous temperature selection in the range from 30^ C to 60^ C.

Recommendation for energy-saving operation:

40°C for washbasin, shower, and bath (knob tangibly engages).

Diagram of a cylindrical device with a circular dial and a pointer, showing internal components (no text or symbols)

55°C for kitchen sink. If this temperature is no longer needed, the appliance should be reset to the 40°C energy-saving level.

Wash basin
Shower
Bath basin
Kitchen sink

When the appliance is operated with a thermostatic mixer tap, the temperature setting on the instantaneous water heater must be around 8^ C higher than on the thermostatic mixer tap.

Hot water flowrate

Up to the appliance's max. power limit, the instantaneous water heater supplies the set hot water temperature regardless of the water flowrate selected.

If the hot water temperature is not attained when the hot water valve is fully opened, more water flows than can be heated by the appliance power. In this case, the hot water tap must be slightly closed.

Because of the different inlet temperatures, the hot water output varies depending on the season.

The following outlet flowrates for bath or shower water (40°C) or washbasin/sink water (55°C) are attained at the inlet temperatures of 6°C, 10°C, and 14°C.

Cold water temperature °C	Outlet temperature 40°C			Outlet temperature 55°C
	18 kW	21 kW	24 kW	18 kW	21 kW	24 kW
	l/min	l/min	l/min	l/min	l/min	l/min
6	7,6	8,8	10,1	5,3	6,1	7
10	8,6 (*8)	10 (*9)	11,5 (*10)	5,7	6,7	7,6
14	9,9 (*8)	11,6 (*9)	13,2 (*10)	6,3	7,3	8,4

(*) limited to this figure by the built-in flow limiter

Care and maintenance of the appliance

Clean the plastic housing as necessary with a damp cloth and dilute soap solution. Never use any abrasive, scouring, and solvent-containing detergents. The instantaneous water heater generally needs no maintenance. Regular inspection of the appliance by a trained engineer will ensure its operational reliability and prolong its service life.

Scale deposits in the outlet of fittings reduce the water flowrate. The air bubblers of the fittings or hand shower head must therefore be cleaned from time to time.

Important instructions for the installer

General

The instantaneous water heater is manufactured and tested in conformity with the valid IEC specifications and DIN standards. The appliance complies with the Appliance Safety Act. The indications given on the rating plate, the technical connection specifications of the electricity and water companies in the geographical area concerned, and VDE 0100 and DIN 1988 must be observed when the appliance is being installed.

The specific resistance of the water at the installation site should not be less than 1100 cm.

This appliance complies with the following EC Directives:

• the "Low-Voltage Directive" 72/23/EEC of 19.02.1973, including
  Amendment Directive 93/68/EEC
• the "Electromagnetic Compatibility" Directive 89/336/EEC of
  03.05.1989 including Amendment Directive 92/31/EEC

Appliance constitution

1 = Back wall
2 =Quick fastener for appliance mounting
3 = Upper cable bushing
3a = Lower cable bushing
4 = Upper mains connection terminal (factory-prefitted)
5 = Flowrate sensor
6 = Safety temperature and pressure limiter
7 = Electronic module
8 = Temperature selector knob
9 = Flowrate limiter
10 = Strainer insert
11 = Cold water connection
12 =Hot water connection
13 = Thermostat
14 = Heating block

Technical data

Model		IH E18 basis	IH E21basis	IH E24 basis
Type unvented
Nominal capacity	I	0,4
DimensionsWidthHeightDepth	mm	22646999
Weight	kg	3,9
Nominal overpressure	Mpa	1
Protection class to VDE		I
Protection type to VDE		IP 25 (splash-water protected)
Test mark		See rating plate
Water connection		G 1/2 A
Electrical connection		3 / PE ~ 380 V
Nominal output	kW	18	21	24
Spec. water resistance at 15 °C	Ohm cm	>1100
Switch-on flow pressure*)	Mpa	0,04	0,035	0,03
Switch-on flowrate	l/min	3
Mains retroactive effect		Free from any mains retroactive effect to DIN EN 60555/VDE 0838VDEW Approval
Maximum inlet temperature	°C	25 °C
Flowrate limitation	l/min	8	9	10

*) In addition to the flow pressures of the instantaneous water heater itself, consideration must be given to the pressure losses in the household pipework.

Appliance function

The fully electronically controlled ELECTROLUX IH instant water heater is a pressurised appliance for the supply of one or more tapping points and heats the water as the latter continuously flows through it. A flowrate sensor switches on the heating at a flowrate of around 3 l/min and off again at around 2,5 l/min. The microprocessor controlled electronic system automatically adapts the heating power with regard for the inlet temperature, the temperature set on the temperature selector knob, and the water flowrate. The user thus has hot water available in an energy-saving system giving the exact temperature required without any time limitation whatever.

The nominal operating pressure is 1 Mpa. If this value is exceeded, a pressure reducing valve should be provided in the household pipework. A safety valve is not necessary.

The bare wire resistance heating system has a high efficiency. Its low weight and extremely low water content also make it suitable for hard, lime-containing water qualities.

Safety temperature and pressure limiter

Mechanical assembly diagram showing wiring connections between three vertical components (no text or symbols visible)

In the event of a fault, the inbuilt safety temperature limiter isolates the appliance from the mains supply on all contacts.

Before the appliance is switched back on, a trained engineer must ascertain and eliminate the cause of the fault (see page 17). Then carefully press in the contact rocker with a screwdriver until it audibly engages.

Important: Don't block up the contact rocker!

Pressurepoint for screwdriver

Important! The safety temperature and pressure limiter should never be adapted or modified in any way!

Installing the appliance

The appliance should only ever be installed or stored in frost-free premises.

Dimensioned diagram

1 = Quick fastener for appliance mounting
2 = Wall mounting
3 = Upper connection terminal (factory-set)
3a=Lower connection terminal for electrical connection
4 = Upper cable bushing
4a=Lower cable bushing for electrical connection
5 = Cold water connection with strainer insert
6 = Hot water outlet

Appliance installation

Carefully unpack and take out the enclosed pack.

Prepare the appliance for assembly.

Hood dismounting

Diagram showing a test tube being heated by a droplet, with arrows indicating the process (no text or symbols present)

Press in the engagement lug on the underside of the appliance from above or from the front with a screwdriver and take off the hood. Pull out the connection lead of the temperature set-point pickup on the electronic system.

The rotational range of the temperature selector knob can be limited (see page 15).

Wall mounting

Mark out wall-plug holes with the mounting template supplied, insert wall-plugs, and screw on fixing rail (1). Take out threaded pin (2) from the enclosed pack and screw in. Then prepare water connections, mount appliance on threaded pin and retaining rail, and fix by turning the quick fastener (3) one quarter revolution.

Water connection

The water inlet temperature on the cold water connection should be max. 25^ C.

If plastic pipe systems are used as installation material, the pipe manufacturer must expressly and unreservedly confirm the applicability and quality of his pipes for this application.

Concealed installation

Insert connector with shutoff spindle (1) in cold water connection and double- nipple (2) in hot water outlet using hemp packing. The shutoff spindle must point downwards and the screw slot aligned in the flow direction of the water. The shutoff unit must not be used for throttling.

The ELECTROLUX IH electronic can be operated with all pressure fittings suitable for instantaneous water heater.

Installation versions

For fittings directly on the appliance, the bushing openings pre-embossed in the appliance hood must be cut out for the extension pipes of the fitting. The supporting sheet (1) enclosed with the fitting fixes the extension pipes in position and seals the housing openings. To ensure moisture protection, the supporting sheet must be fitted.

Fitting must be vertically seated and centrally under the appliance. Seal appliance connection to the wall, where necessary, with G 1/2 A blind plugs (2) (fitting accessory).

If a cold water supply is made to the appliance, the shutoff adapter (3) should be replaced by an adapter with a wood screw (4) for fixing the fitting in place.

The following tapping fittings are suitable:

D 169 - Special mixer tap with swivelling outlet
D 159 - Special shower mixer tap
D 149 - Special bath mixer tap with change-over tub/shower

Important! After completion of the water installation, the appliance should be thoroughly flushed with cold water (open the hot water valve). The strainer insert may possibly need cleaning afterwards.

Cleaning the strainer insert

If the water flowrate is reduced by dirt from the cold water line, the strainer-insert should be cleaned as follows:

• Shut off cold water on shutoff unit (1)
• Loosen cap nut (2) using a spanner
• Take out and clean strainer (3)
• Re-assemble in reverse sequence
• Open cold water on shutoff unit (1); check tightness

Flow rate limiter

The flow rate limiter (2) is installed in the cold water connector (1) to allow a constant outlet temperature at high flow pressures of approx. 40^ C, suitable for showering. (See table page 4 and 6)

Electrical connection

The electrical connection should only ever be made after the water is connected! The appliance is only suitable for a fixed connection of 380 V 3 \~ (three-phase current).

The appliance must be connected to the protective conductor.

Important note: The wiring must be arranged so that the appliance can be de-energised (disconnected from the electricity supply) before any intervention involving the fuses being unscrewed, the automatic safety devices being switched off, or similar measures being taken (isolating gap width of at least 3 mm).

Mains connection lead

The connection cable must project from the wall over an insulated length of at least 20 mm.

Mains connection on top

Electrical connection terminal (3) factory-prefitted.

Cut out cable inlet opening (1).

Slide flexible inlet bush (2) over connection cable, insert it through the back wall opening, and screw fixing strap under connection terminal (4).

Mains connection underneath (alternative)

For this connection version, transpose the mains connection terminal (1) from top to bottom.

Note the terminal designation on the back wall, and do not cross the connection leads to the safety temperature limiter.

Carry out cable inlet opening

(2), inlet bush (3), and bush fixing under the mains connection terminal as described above for mains connection.

Important! Moisture protection is only guaranteed with the inlet bush fitted in position.

Circuit diagram

graph TD
    A["Main connection terminal"] --> B["Heating block"]
    B --> C["Electronic system"]
    C --> D["LED 1 2"]
    D --> E["IN"]
    E --> F["Ground"]
    G["Safety-temperature and pressure limiter"] --> H["L1(R), L2(S), L3(T), PE"]
    H --> I["Main connection terminal"]
    I --> J["Main junction blocks W4-W1, L1-L3"]
    J --> K["Diode 4"]
    K --> L["Inductor L1"]
    L --> M["Switch K"]
    M --> N["Power Supply"]
    style A fill:#f9f,stroke:#333
    style C fill:#ccf,stroke:#333

Temperature selector range limitation

The maximum temperature able to be set can be limited to 40^ C or 45^ C.

Important! Before dismantling, set the knob to the minimum temperature of 30^ C.

Detach the temperatur set-point pickup (2) in the appliance hood. Turn the setting dial (3) so that the printed set-point coincides with the hood mark (1).

Do not twist the selector axis and plate of the temperature set-point pickup when reassembling!

Hood dismounting

Plug the connection lead of the temperature set-point pickup into the electronic system, suspend the appliance hood in the upper edge of the back wall, and swivel it downwards until it audibly engages.

If necessary, the hood can be supplementarily fixed with a screw next to the engagement lug.

Using the appliance for the first time and checking

The unit must be installed and started up by an approved firm of installers which accepts liability for safety and proper function.

Before the appliance is energised (connected to the electricity supply), it should be thoroughly flushed with cold water and the tightness of the screwed joints checked.

After the instantaneous water heater is energised (connected to the electricity supply), it should be inspected by a trained engineer to ensure that it is in proper working order. For protection of the heating systems, the system is arranged for a switch-on delay of 5 - 25 s at initial startup and after the appliance has not been live for any length of time.

Important: After any work carried out on the water supply unit, the appliance should also be thoroughly flushed with cold water (vented) before being switched on again. Only then should the appliance be reconnected to the electricity supply.

After initial startup, the user should be familiarised with operation of the appliance and the instructions for installation and use handed over for safekeeping.

Fault-finding (important instructions for the trained engineer)

In the event of any fault, a check should first be made to ascertain whether the fuse and line protection switch have tripped.

	CauseFault Remedy
- Heating system does not switch on	- Appliance is not live	Check the voltage
- Hot water flowrate too low	- Strainer insert is clogged	Clean strainer insert (see page 12)
	- Soiling or scaling of bubblers and shower heads	Dismantle and clean the bubblers and showers heads
	- Defective heating system	Inspection and repair only by the trained engineer
- Safety temperature and pressure limiter has tripped	- Inadmissibly high cold water inlet temperature (over 25 °C)	Appliance should not be operated with preheated water.
	- Inadmissibly high outlet temperature (over 70 °C)	Inspection and repair only by the trained engineer
- Active fault indicator (LED)	- System fault (see table on page 18)	Inspection and repair only by the trained engineer

Fault indications

Fault pattern	Indicator Possible faults
	LED 1 LED 2
1 No displayAppliance does not workNo displaySetpoint temperature not reachd		- Flowrate sensor not plugged / defective- L1 or L3 phase missing- L2 phase missing
2	FLASHES long	FLASHES longConstantwarm water temp. 37°C
3	FLASHES long	FLASHES shortNo heat output
4	FLASHES long	ONNo heat output
5	OFF	ONNo heat output

*) The individual fault are indicated every 5 sec. The indication mode starts afresh every 40 sec.

Important! If the fault has been rectified, the fault memory goes automatically in Reset - Function.(Sometimes with cold water flow phase ca.15 sec.)

Important for the expert

The electronic controls the safety-function of the appliance. When a fault is noticed, the fault indicator (LED) blinks and the heating element is switched off.

After the fault has been recitified, fault memory will be automatically cancelled Instructions for the fault finding see in "Instructions for installation and use" page 17 and 18.

Customer service

If your appliance has a fault, please contact your customer service centre for advice.

Electric appliances should only ever be repaired by a trained electrician, since the user may be seriously endangered by improper repairs.

A list of the addresses of customer service centres is attached.

If your appliance requires service, you will need to quote these

numbers indicated on the rating plate.

To save enquiries, copy the data from the rating plate and keep them handy.