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QETTLE Checklist

Pressure Gauge

Connection to a mains water supply.

Cold water pressure between 1.5 bar and 5 bar is required for QETTLE taps. If your cold water pressure exceeds 5 bar, a pressure reducing valve must be fitted.

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Water pressure

The water pressure of most properties is typically between 1.5 - 5 bar (it’s usually around 3). In a few cases, where water pressure is greater than 5, a pressure reducing valve must be fitted to reduce the pressure.

Measuring Your Water Pressure

To test your water pressure you’ll need a water pressure gauge. Gauges are widely available from online retailers such as Amazon and are relatively inexpenive.

Use an outside/garden tap to test your cold-water pressure (if you don’t have an outside tap, there may be an existing ¾” BSP connection underneath your sink you can use). Outside taps usually have a ¾” BSP connection – so you should be able to screw the pressure gauge straight onto the outside tap. Once the gauge is attached to the tap, turn the tap on and take the pressure reading.

Pressure Gauge

Connection to a hot water supply (4-in-1 taps only).

A supply of hot water with a minimum pressure of 1.5 bar is required for QETTLE 4-in-1 taps.

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Hot water pressure

If you’re unsure what your water pressure is, knowing what type of plumbing system your home has will help.


Plumbing SystemsPlumbing Systems

1. High Pressure Systems usually generate enough water pressure for our taps.

2. Low Pressure Systems typically don’t generate enough pressure for the QETTLE Original to work perfectly (not an issue for the QETTLE Mini). The boiling water, filtered drinking water and your normal mains cold flow are unaffected but your hot water flow will be much slower than with a conventional kitchen tap. If your hot water flow is slow, you can fit a "blender valve" onto your tank. A blender valve uses the hot water from the QETTLE boiler rather than from your hot water supply which maintains a good hot flow. We usually recommend a larger boiler tank in these cases.

Pressure Gauge

A standard, 13 amp socket to plug in your QETTLE’s boiler tank.

You’ll need a double socket if you are also installing a QETTLE Chiller.

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Power Source

Power to the QETTLE’s boiler tank is supplied via a standard, 13 amp socket under the sink. The socket should be installed prior to your QETTLE being installed and is not included in the QETTLE installation.

You’ll need a double socket if you’re also installing a QETTLE Chiller.

Stop Cock

The ability to shut off the water.

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Isolate Water Supply

Water can be isolated either by isolation valves on the existing hot and cold water pipework under your kitchen sink, or by using your home’s stopcock.

Waste Connection

An under sink waste pipe already in place.

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Waste Connection

If you have a functioning kitchen sink, you’ll already have a waste connection. QETTLE’s vent assembly attaches to your sink’s waste. Find out more about what the vent does and how it should be fitted here.

Space for your Boiler

Space for your QETTLE’s boiler tank under the sink.

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Undersink requirements

A 4L QETTLE boiler tank and filter system can be accommodated by a 400mm wide (or larger) kitchen cupboard. If you are also installing a QETTLE Chiller, your cupboard should be a minimum width of 600mm and proper ventilation is essential.

There must be clearance of at least 80mm above the top of a boiler tank and/or chiller to ensure hoses and connections are not squashed.

Take care if you have a Belfast or butler sink.

2L Boiler223 x 170 x 293mm
4L Boiler230 x 182 x 370mm
7L Boiler295 x 235 x 370mm
Filter system90 x 90 x 345mm
Chiller320 x 182 x 370mm

Depth x Width x Height


A 35mm diameter hole (this is the UK standard tap hole size) for your QETTLE tap.

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Preparing your work surface

Your QETTLE tap will need a 35mm diameter tap hole, which is the UK standard tap hole size.


All QETTLE taps (apart from the QETTLE Signature Classic and Signature Mixer taps) use a “progressive valve” to control the normal hot/normal cold flow of water. The lever handle only moves outwards and forwards, so there is no need to worry if your tap is positioned close to the wall or splash back.


If you are ordering a QETTLE Signature Classic or Signature Mixer tap, please ensure there is 10cm clearance between the centre of the tap hole and the wall or splash back. Alternatively, you can select the progressive valve handle when choosing a QETTLE Signature Classic in the checkout.


 QETTLE Original / SignatureQETTLE Mini
Hole Diameter35mm35mm


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