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Watering Unit WT 4 26451740 https://www.kaercher.com/uk/home-garden/watering-systems/automatic-watering/watering-unit-wt-4-26451740.html Easily progammable watering unit for watering on demand. Watering starts and stops at preset time. With removable display. With tap adapter and pre-filter.
Kärcher 43.99 GBP

Watering Unit WT 4

Easily progammable watering unit for watering on demand. Watering starts and stops at preset time. With removable display. With tap adapter and pre-filter.

Part number: 2.645-174.0
Find your local Kärcher Center:

Precise watering on demand: The new Watering Unit WT 4 is especially easy to program. The removable display, the large control knobs and the clearly arranged panel makes the programming easy and effortless. The maximum watering duration goes up to 120 minutes. The watering starts and stops right on schedule and automatically to a preset time. Tap adapter and prefilter are included, the 9-Volt-battery not. Therefore the water does not flow unless it is actually needed. This is good for the environment while it also saves money. Kärcher water timers are compatible with all common click-on systems.

Features and benefits
9 V battery not included
Removable display
  • For convenient programming.
Automatic start and stop
  • Precise watering.
Including tap adaptor and pre-filter
Individual setting of watering frequency
  • Watering on demand.
Indicator light for programming and battery status
Manual watering possible
Watering up to 120 min.
Flexible choice of start time

Technical data

Weight (kg) 0.3
Weight incl. packaging (kg) 0.5
Dimensions (L x W x H) (mm) 115 x 120 x 125
-- When connecting these products to the drinking water network, you must observe the requirements of EN 1717. If necessary, ask your sanitary specialist.


  • Batteries required
  • Batteries included in the scope of delivery, no
  • Number of batteries, 1 x 9 V Block
Application areas
  • For watering small to large areas and gardens.
  • For watering under trees and bushes.
  • For watering large gardens.
  • For watering food plants and useful plants (small beds, individual and pot plants).
  • For watering small beds, individual and pot plants.

Watering Unit WT 4 is rated 2.7 out of 5 by 3.
Rated 2 out of 5 by from No information: minimal water pressure I've just bought this unit with idea to use it to feed my irrigation system from lifted cubic tank (IBC tank). But it didn't work so I brought it to Karcher warranty service and only there I was informed, that there is a minimal water pressure so the unit could do it job. So I have useless watering unit :)
Date published: 2018-07-11
Rated 5 out of 5 by from Simple and effective Another reviewer seems to have misunderstood the way the unit is programmed and how it controls watering frequency. It is not a traditional timer; on the left hand side you set the interval between watering e.g. every one hour, say, or every five hours (odd choice but there you go), or the number of days between watering. On the right hand side you set the duration of the watering session. So every day at 18:00 for an hour would mean (I believe) setting an interval of one day and a duration of one hour and making these settings at 18:00. Then the unit would, every 24 hours run the water supply for one hour. The available frequency options and durations provide adequate flexibility for nearly every gardener.
Date published: 2016-11-19
Rated 1 out of 5 by from unusable We have 24 hours in our day your timer has only 12 ! I want mine to start at 18.00 hours ! ! !
Date published: 2016-08-24
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