Read these original instructions and the enclosed safety instructions before using the device for the first time. Act in accordance with them.

Keep both books for future reference or for future owners.

• If the operating instructions and safety instructions are not observed, the device can be damaged and dangers could arise for users and other persons.

• Notify the dealer immediately in the case of shipping damage.

• Check the package contents when unpacking for missing accessories or for damage.

The packing materials can be recycled. Please dispose of packaging in accordance with the environmental regulations.

Electrical and electronic appliances contain valuable, recyclable materials and often components such as batteries, rechargeable batteries or oil, which - if handled or disposed of incorrectly - can pose a potential threat to human health and the environment. However, these components are required for the correct operation of the appliance. Appliances marked by this symbol are not allowed to be disposed of together with the household rubbish.

• The booster heater is an electrically heated device for wall mounting for heating liquids under high pressure.

• This booster heater is intended for cleaning with hot water in combination with an on-site cold water high-pressure cleaner.

• The booster heater is switched on with the main switch. As soon as a sufficient quantity of liquid flows through the booster heater, the flow switch switches the heating on.

• With the booster heater, you can heat water using electrical energy. Its use makes sense wherever the exhaust gas discharge of a burner is problematic.

• The achievable temperature depends on the water flow rate, i.e. the pump capacity of the pump used (see Technical data for average value).

• The set temperature is controlled by a thermostat.

No modifications may be made to the device or accessories.

• Observe the respectively applicable national regulations for liquid jet cleaners.

• Observe the respectively applicable national accident prevention regulations. Liquid jet cleaners must be tested regularly and the results of the test recorded in writing.

Safety devices protect the user and may not be disabled or functionally circumvented.

The water shortage safeguard (flow switch) prevents the heating from switching on when there is a lack of water.

The safety thermostat switches off the heating and the circuit breakers in the event of excess temperature (100 °C). The circuit breakers must be switched on again once the cause of the fault has been rectified.

If the maximum permissible system pressure is exceeded, the safety valve opens to relieve the pressure in the system. The safety valve is adjusted and sealed at the factory. The adjustment is performed only by customer service.

1. Connect a high-pressure hose (with a minimum nominal width of 8 mm) to the high-pressure gun and the high-pressure outlet (red) on the device, and tighten by hand.

2. Connect a high-pressure hose (minimum length 1.5 m, minimum nominal width 8 mm) to the cold-water high-pressure cleaner and the high-pressure inlet (blue) on the device, and tighten by hand.

3. The pressure inlet and the pressure outlet must be attached to the connections provided for this purpose. Pay attention to the prescribed flow direction.

• For connected loads, see technical data and type plate.

• The electrical connection must be carried out by an electrician and comply with IEC 60364-1.

1. Open the water inlet.

2. Set the temperature limiter to the desired temperature.

3. Turn the main switch of the booster heater to position “1”.

4. Switch on the cold water high-pressure cleaner in accordance with the manufacturer's operating instructions. If the water flow rate is sufficient, the booster heater switches on automatically. When the heating is switched on, the indicator light lights up green.

5. Unlock the high-pressure gun. When the high-pressure gun is actuated, the cold water high-pressure cleaner switches on.

1. Perform cleaning.

• 30-50 °C: Light soiling

• Max. 60 °C: Soiling containing protein, e.g. in the food industry

• 60-90 °C: Car cleaning, machine cleaning

1. Turn the main switch of the booster heater to position “0”.

2. Operate the device with cold water for at least 2 minutes with the gun open.

3. Close the water inlet.

4. Switch off the cold water pressure washer in accordance with the manufacturer's operating instructions.

5. Operate the high-pressure gun until the cold water high-pressure cleaner and the booster heater are depressurised.

6. Secure the high-pressure gun.

7. Remove the high-pressure hose from the high-pressure input.

8. De-energise the booster heater and secure it against being switched on again.

1. Shut down the device if frost-free storage is not possible.

For longer breaks in operation or when frost-free storage is not possible:

1. Drain the water.

2. Flush the device with antifreeze.

1. Unscrew the high-pressure hoses from the high-pressure input and high-pressure outlet.

1. Flush the cold water high-pressure cleaner and the booster heater fully with a commercial antifreeze.

This also provides a certain degree of corrosion protection.

1. When transporting the device in vehicles, secure it to prevent it from slipping or overturning in accordance with the respective valid guidelines.

1. Switch the device off (see Operation).

2. Allow the device to cool down.

You can agree on regular safety inspections or close a maintenance contract with your dealer. Please seek advice on this.

1. Check the mains cable for damage. Do not operate a device with a damaged mains cable. Have a damaged mains cable replaced immediately by authorised customer service or a qualified electrician.

2. Check the high-pressure hoses for damage (risk of bursting). Immediately replace a damaged high-pressure hose.

1. Check whether the device needs to be descaled as the set temperature is no longer being reached. The descaling interval depends on the water hardness and the extraction temperature.

1. Have the device maintained by Customer Service.

1. Carry out maintenance work on the cold water high-pressure cleaner as directed in the manufacturer's operating instructions.

If deposits build up in the pipelines, the flow resistance increases so that the set temperature is no longer reached.

Execution:

According to legal regulations, only approved boiler solvents with a test certificate may be used for removing deposits.

• RM 101 (order number 6.295-398.0)

1. Fill a 20 litre container with 10 litres of water.

2. Add 1 litre of scale solvent.

3. Connect the water hose directly to the pump head (water inlet) of the cold water high-pressure cleaner and hang the free end into the container.

4. Place the spray lance connected to the booster heater in the container without a nozzle.

5. Switch on the cold water high-pressure cleaner in accordance with the manufacturer's operating instructions.

6. Open the high-pressure gun and do not close it again during descaling.

7. Run the cold water high-pressure cleaner for 2 minutes.

8. Switch off the cold water high-pressure cleaner and let it stand for 20 minutes. The high-pressure gun must remain open.

9. Remove the water hose from the pump head (water inlet) of the cold water high-pressure cleaner and restore the original water inlet.

10. Remove the spray lance from the container.

11. Then pump the scale solvent from the cold water high-pressure cleaner and the booster heater without a spray lance and high-pressure gun.

• Device does not heat 

• Device does not heat properly 

Cause:

No mains voltage

Remedy:

1. Check the power protection, power supply and the supply line.

2. Switch on the device at the main switch.

3. Contact Customer Service.

Cause:

Water shortage

Remedy:

1. Check the water connection and the supply lines.

2. If necessary, clean the strainer in the water inlet of the cold water high-pressure cleaner.

Cause:

Water flow too weak

Remedy:

1. Increase the water flow.

Cause:

High-pressure inlet and high-pressure outlet connected the wrong way round

Remedy:

1. Connect the high-pressure inlet and high-pressure outlet correctly.

Cause:

Leak in the high-pressure system

Remedy:

1. Check the high-pressure system and the connections for leaks.

Cause:

Temperature controller defective, safety thermostat has switched off the device

Remedy:

1. Contact Customer Service.

Cause:

Flow switch defective

Remedy:

1. Contact Customer Service.

Cause:

Faulty temperature controller

Remedy:

1. Contact Customer Service.

Cause:

Heating coil scaled

Remedy:

1. Descale the device.

If the malfunction cannot be corrected, the device must be checked by the Customer Service department.

• Device does not heat 

• Device does not heat properly 

Cause:

No mains voltage

Remedy:

1. Check the power protection, power supply and the supply line.

2. Switch on the device at the main switch.

3. Contact Customer Service.

Cause:

Water shortage

Remedy:

1. Check the water connection and the supply lines.

2. If necessary, clean the strainer in the water inlet of the cold water high-pressure cleaner.

Cause:

Water flow too weak

Remedy:

1. Increase the water flow.

Cause:

High-pressure inlet and high-pressure outlet connected the wrong way round

Remedy:

1. Connect the high-pressure inlet and high-pressure outlet correctly.

Cause:

Leak in the high-pressure system

Remedy:

1. Check the high-pressure system and the connections for leaks.

Cause:

Temperature controller defective, safety thermostat has switched off the device

Remedy:

1. Contact Customer Service.

Cause:

Flow switch defective

Remedy:

1. Contact Customer Service.

Cause:

Faulty temperature controller

Remedy:

1. Contact Customer Service.

Cause:

Heating coil scaled

Remedy:

1. Descale the device.

The warranty conditions issued by our relevant sales company apply in all countries. We shall remedy possible malfunctions on your appliance within the warranty period free of cost, provided that a material or manufacturing flaw is the cause. In a warranty case, please contact your dealer (with the purchase receipt) or the next authorised customer service site.

Further information can be found at: www.kaercher.com/dealersearch

Further warranty information (if available) can be found in the service area of your local Kärcher website under "Downloads".

Only use original accessories and original spare parts. They ensure that the appliance will run fault-free and safely.

Information on accessories and spare parts can be found at www.kaercher.com.

We hereby declare that the product named below complies with the relevant provisions of the directives and regulations listed. This declaration is invalidated by any changes made to the product that are not approved by us.

Product: High-pressure booster heater

Type: 3.070-xxx

2006/42/EC (+2009/127/EC)

2011/65/EU

2014/30/EU

2014/35/EU

2014/68/EU

EN IEC 63000: 2018

EN 55014-1: 2017 + A11: 2020

EN 55014-2: 2015

EN 60335-1

EN 60335-2-79

EN 61000-3-2: 2014

EN 61000-3-3: 2013

The signatory acts on behalf of and with the authority of the company management.

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Oischinger Elektro- u. Maschinenbau GmbH

Wandersmannstr. 1b

65205 Wiesbaden, Germany

Wiesbaden, 01/10/2024