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Kärcher RLM 4 - robot lawn mower - (2019 model)
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Kärcher RLM 4 - robot lawn mower - (2019 model)

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* Prices in GBP incl. VAT and delivery, if applicable

Due to a high volume of orders, the delivery time of our delivery service providers may be extended. Read more
  • Delivery time: 3 to 5 working days.

  • Express shipping available

    You will have the opportunity to select DHL Express. Orders which are placed until 12.00 p.m. and are in stock, will be shipped on the same day. The additional fee depends on your delivery address and cart.

More information about product

Kärcher RLM 4: a robot lawn mower that promises plenty of leisure time

Garden care can also be convenient! The new robot lawn mower by Kärcher makes you sit up and take notice: It is designed for areas up to 500 m2 and masters gradients up to ± 45 %. Three freely selectable entry points can be selected for this robot mower. Equipped with a lithium-ion battery and intelligent multi-sensor technology, the 8.8 kg light robot grass cutter does its job reliably. Set individual mowing times – lean back and relax.

Due to a high volume of orders, the delivery time of our delivery service providers may be extended. Read more
  • Delivery time: 3 to 5 working days.

  • Express shipping available

    You will have the opportunity to select DHL Express. Orders which are placed until 12.00 p.m. and are in stock, will be shipped on the same day. The additional fee depends on your delivery address and cart.


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5-year guarantee

Product description

The Kärcher RLM 4: a robust companion for your garden

The Kärcher RLM 4: a robust companion for your garden

When lawn mowing is fun: The Kärcher RLM 4 is the ideal partner for gardens up to 500 m2. A four-blade system ensures a thorough mowing result. The robot grass cutter reaches the lawn edge down to a few centimetres (with a cutting width of 20 cm). Specially rubberized wheels allow it to climb gradients up to ± 45 %. Theft protection included: PIN code lock and alarm function ensure security.


A small mountaineer with a profile

Small but powerful: The Kärcher RLM 4 can handle gradients of up to ± 45 % without any problems. The rubberized wheels, which are equipped with a grippy profile, are responsible for optimum traction.

Quieter than a normal lawn mower

At only about 60 dB, the robot lawn mower is significantly quieter than a normal lawn mower. For this reason, it can also be used at times when, for example, a lawnmower would disturb your neighbours. The Kärcher can also be used at night, but we advise against this (nocturnal animals).

Mows when it rains if desired

The Kärcher RLM 4 is equipped with a rain sensor. This means that the robot mower detects when it starts raining. It then drives back to the charging base and only continues to mow when it has stopped raining. However, the rain sensor can also be set to mow when it is raining. 

Also drives over hilly lawns

The robot grass cutter mows both lawns with and without gradients very reliably. It easily mows inclines of up to + 45 %, because its rubberised wheels ensure a good grip - even on slippery terrain. It should be noted that there should be no incline along the boundary wire.

Four knives for the perfect cut

With its unique four-blade system, the robot lawn mower ensures a thorough mowing result. While two-sided sharpened cutting blades trim the grass, two clearing blades take care of the dirt in the body of the robot. The robot mower reaches the lawn edge down to just a few centimetres and passes narrow areas with a width of up to 60 centimetres. Even more: The cutting blades of the robot grass cutter can be mounted in the opposite direction as soon they are worn out and can therefore be used for a longer time.


Intelligent multi-sensor technology

The robot lawn mower is equipped with collision, tilt, lift and even loop sensors. When it rains, an adjustable rain sensor can be used to select if the robot grass cutter should continue mowing – or drive back to the charging station. Apropos charging station: If the battery is almost empty, the robot mower returns back to its charging station automatically.


Easily installed in your garden

The Kärcher RLM 4 can be put into operation in just a few steps: The robot lawn mower is started and stopped manually via a display and the mowing times are individually determined. One hand is enough to adjust the cutting height (between 25 and 55 mm). The special thing about this is that the cutting height is easily visible at all times because of an integrated magnifying glass.


Don’t give thieves a chance

The robot grass cutter is not only a professional lawn mower, but can also score points in terms of safety: Choose your personal PIN code and protect your robot lawn mower with the PIN code lock and alarm function.

The advantages of the Kärcher RLM 4 at a glance:

  • Four-blade system (incl. broaching knife)
  • Gradients up to ± 45 % possible
  • Cutting width: 20 cm
  • Cutting height adjustment with magnifying glass
  • Collision, tilt, lift AND loop sensors
  • Rain sensor
  • Simple operation via display
  • Theft protection (with individual PN code allocation) 

Scope of delivery

Kärcher RLM 4
Kärcher RLM 4 - robot lawn mower - (2019 model)
  • Kärcher RLM 4 Lawn mowing robot
  • • Quickstart Guide
  • • User Manual
  • • 90 Lawn pegs
  • • Power supply
  • • Winter cover
  • • Charging station
  • • 5 Grass screws with spanner
  • • 100m Boundary cable
  • • Cardboard ruler

Technical details

More information
Model NameKärcher RLM 4 - 2019 model
Gradient:±45 % (24°)
Lawn complexity:Simple
Dimensions59,8 x 40,0 x 28,5 cm
Weight (approx.):8,8 kg
Mowing modeFour-blade system (two-sided sharpened cutting blades and two clearing blades)
Cutting height25 - 55 mm
Cutting width20 cm
Mowing in rain:Rain sensor (not adjustable)
Charging time45 min.
Battery runtime50 min.
Battery typeLithium ion battery (18 V/ 2,5 Ah)
Battery guarantee:1 year
Product guarantee:5 years
Boundary optionBoundary wire
Safety:PIN code, theft protection, alarm function, collision, tilt, lift and loop sensors
Volume:60dB (A)
Special features:• Cut to edge • Mulch function • Theft protection

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Guides & manuals

Customer Review(s)

With their technical sophistication and excellent range of features, robots from myRobotcenter never fail to impress. Our robots are guaranteed to provide you with more free time and a better quality of life. Guarantee is also the key word when it comes the longevity of our products. Thanks to their sophisticated, tried and tested technology, our products have proven to be extremely reliable and free of faults. If a design fault should arise, then you can rely on a guarantee that – with many products – extends far beyond the statutory minimum.


Extension of the guarantee to 5 years

Our products come with a manufacturer's guarantee (generally 2 years). At myRobotcenter you get an even longer guarantee on many products: we extend the guarantee period to 5 years.


Complete security over many years

Our 5-year guarantee on labelled products is both a mark of quality and a very special service for you as our customer. In addition to the respective guarantee, we provide  you with all the details about the conditions of our guarantees and which services you can expect from us.


What does the guarantee cover?

The 5-year guarantee covers devices bought from us when accompanied by a receipt or another document that proves the validity of the 5-year guarantee. The 5-year guarantee ends five years after the device was purchased. The guarantee is valid for guarantee claims that occur in United Kingdom.


A guarantee claim is valid when the device purchased by you is damaged or destroyed, as a result of the following causes:

  • construction fault, calculation error, casting defect, material defect and production fault

  • direct effects of electrical energy as a result of a ground fault, short circuit, excessive increase in the current strength, electrical arc-over, formation of electrical arcs, insulation faults, excess voltage and the like.

Excluded from the guarantee is damage caused by external influences, such as a bounce flash in the circuit or fire damage. Such externally induced damages can be covered under certain circumstances by your household insurance and may include:

  • measuring, controlling and safety device failures

  • excessive pressure other than explosions

  • implosion and other effects of insufficient pressure

  • lack of water in steam boiler and other apparatus

  • bursts due to centrifugal force


Within the framework of the extended guarantee, operating errors are covered insofar as they impair the functionality of the product and do not represent a contravention of the operating instructions. For such cases we shall charge an excess of 84 GBP including VAT.


What is NOT covered by the guarantee?

  • Wear and tear, and damage to wearing parts and batteries (the battery is only covered by the manufacturer's guarantee)

  • Damage that does not impair the technical function of the device, e.g. scratches and scuffs.

  • Damage or destruction due to intentional or grossly negligent acts or omissions on the part of the purchaser or other users of the device.

  • Damage or destruction caused by improper installation/assembly, by improper repairs/adjustments, by improper, non-intended or unusual use or cleaning of the device – especially when the manufacturer’s instructions are not followed – and by operating errors.


What service do we provide in valid guarantee cases?

  1. When repair is technically and objectively possible and the costs of repair do not exceed the current value of the device (see clause 3), the device shall be repaired professionally and the costs incurred in the repair reimbursed by the guarantee.

  2. Should repair be technically or objectively impossible or uneconomical (total write-off), you shall receive a replacement device of the same kind and quality up to the amount of the current value (see clause 3). The damaged or destroyed device is returned to us and becomes our property.

  3. The current value of your device is 50% of the purchase price in the 3rd year after conclusion of purchase contract, 40% in the 4th year and 30% in the 5th year of the purchase price as stated in the receipt.


Is your device broken?

Just ask us for help. We will support you with the repair request.

  1. In the matters of a needed repair, a skilled and trained team in service and repair department from us or from the manufacturer itself, will gladly be there for you with advice and act to the side.

  2. Please take care of packing the robot carefully to avoid damage.

  3. Enclose a detailed description of the fault as well as the invoice together with the 5-year guarantee certificate.

  4. The robot must be fully postage paid at and sent to the mentioned address.

  5. Transport costs are paid by you and will not be refunded. We recommend that you keep the postage receipt.


Correct as of: May 2020