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Things To Consider With A Low Pressure Gravity-fed System

17 Oct 2017, 9:15 AM

Low Pressure Gravity System

What Is A Low pressure gravity-fed system?

Low pressure gravity-fed systems are one of the most common domestic water systems installed in homes in the UK. Low pressure gravity-fed systems consist of a cold water tank usually situated in your loft and a hot water tank (or cylinder) that is normally in your airing cupboard.

How much pressure is produced by a Low pressure gravity-fed system?

The pressure a Low pressure gravity-fed system offers is determined by the height at which the base of the cold water tank (the bottom of the tank) is situated above the outlet (shower head not valve). The amount of pressure is calculated in Bar and is worked out be 1m Fall = 0.1bar pressure. The greater the height of the tank above the showerhead the more pressure is created.

If you have this kind of system you can install a low pressure mixer shower, pumped digital shower or all-in-one power shower and you will have a great showering experience. If you decide on a mixer and want a more forceful shower, fitting a shower pump will boost the flow rate and pressure even more.

Can I have a shower pump?

Only low pressure gravity-fed water systems can be pumped. The flow rate you are currently getting from your water system, combined with the number and type of installations you have in your property, will determine what kind of pump you require. Check with your installer that the cold water storage tank and hot water cylinder are big enough (as the hot water may run out). Check with a local installer before purchasing a pump.

Pressure does not only effect showers!

Water pressure does not only effect showers but also needs to be considered when choosing bath filler taps and basin taps. If you choose a tap not suitable for a low pressure system then you may find it takes a very long time to fill your bath.

Can I increase pressure without a pump?

Water pressure can be increased in your home without a pump in 3 different ways.

First of all the cold water tank in the loft could be raised higher if there is enough room above the tank. This will increase the pressure of the water, but raising the tank a whole one meter will only increase pressure by 0.1bar

Install a combi boiler. Installing a combination boiler will remove both hot water and cold water tanks and offer high pressure hot water throughout your home.

Install a pressurised cylinder or megaflow cylinder. These will replace your existing hot water tank and uses mains pressure to refill and force out the water from the tank instead of water from the cold water tank in the loft. This make the tank in the left redundant and can be removed.

Should you wish to increase the pressure of hot water in your home, speaking to a local gas safe installer is advisable.

Rubberduck Bathrooms

Should you require more information please feel free to contact us at Rubberduck Bathrooms.


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This guide was created for reference only. www.rubberduckbathrooms.co.uk can not be held responsible for injury or damage cause if you decide to use this method.

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