Tap aerator buying guide

Tap aerator buying guide

Sebastian, self-taught DIY-er, Exeter

Guide written by:

Sebastian, self-taught DIY-er, Exeter

Whether you're looking to save money or do more for the environment, reducing the flow rate of your taps is a great way to save water. Water-saving devices such as aerators can be installed inside the tap or onto the end of the spout, helping you to reduce your water consumption by around 30 to 70%.

Important features

  • Type of aerator
  • Flow rate
  • Dimensions and thread type
  • Aerating spray attachments
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The advantages of tap aerators


Tap aerators are fitted inside the spout in order to reduce the flow of water from a bathroom or kitchen tap.

Allowing you to decrease your water consumption by around two thirds, these little devices work by mixing pressurised air with the water. Depending on the model, you can save around 30% to 70% of water while maintaining the same level of comfort.

Flow rate of aerators

Aerators are categorised by flow rate per minute; choose from 2, 3, 6, 8 litres, and so on.

Types and features of tap aerators

Tap aerators come in a variety of different models.

Two-flow tap aerator 

Art und Eigenschaften der unterschiedlichen Perlstrahler

These devices allow you to adjust the power of the water. With a simple twist, you can go from a concentrated stream to an aerated spray.

LED tap aerator

Art und Eigenschaften der unterschiedlichen Perlstrahler

These models are equipped with LEDs that light up when the water is turned on. The tap stream changes colour depending on the temperature of the water making these devices a great choice for children or elderly people.

Swivel flow restrictor 

Art und Eigenschaften der unterschiedlichen Perlstrahler

Fitted with a metal ball bearing, these nozzles are used to direct the stream of water around a kitchen or bathroom sink.

Thread size

A vital factor in choosing your aerator is finding the right thread size to screw the device into the tap spout. Aerators may be male or female and their thread size is usually given in millimetres, for example:

  • F or M 28 mm

  • F or M 24 mm

  • F or M 22 mm

  • F or M 21.5 mm

  • F or M 18 mm

  • F or M 16.5 mm

  • F or M 16 mm

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Aerating spray attachments

An aerating attachment mixes air in with your water stream and reduces the spout size to decrease the flow rate. Designed to prevent splashing and allow you to direct the stream like a handheld shower, these attachments generally take the form of a 125 mm flexible extension hose. They are available in a range of materials.


Die unterschiedlichen Strahlregler

If you're looking for style, your best bet is to go with a metal attachment with modern design. These devices generally consist of a spiral hose made of nickel-plated brass or stainless steel. An additional aerator can be added to the end of these extensions. They can even be equipped with a shower head and are used to significantly reduce water consumption.


These models are equipped with a rubber flow restrictor at the end of the hose. Although lightweight and flexible, they are not the most attractive option but they are very affordable. These attachments fit onto any tap spout with ease but may yellow or crack over time.


Die unterschiedlichen Strahlregler

PVC aerators are more attractive and modern-looking than rubber models. They are also equipped with a flow restrictor inside the end of the nozzle and are resistant and easy to clean.

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Tap spout

More information

Follow these links for advice on bathroom accessories and more helpful guides:

Shop our tap aerators and flow restrictors

Guide written by:

Sebastian, self-taught DIY-er, Exeter

Sebastian, self-taught DIY-er, Exeter

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