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Domestic Pressure Boosting

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Boosting domestic water pressure

Why would I want to boost my water pressure ?             

We are increasingly asked if it is possible to boost the water pressure in a domestic installation. This is commonly because an existing water main has had its pressure reduced to combat leaks or new buildings are sharing an existing water main which cannot cope with the increased demand at peak times or you have just had a combi boiler fitted.

Can I attach a pump directly to my incoming mains?

NO! Fitting a pump directly to the main is not possible for two reasons:

  • Water Bye-laws specifically exempt you from installing any pump to your incoming main.
  • More importantly pumps are not designed to ‘suck’ water only to push it and thus if the existing supply is inadequate then the pump will be starved of water and provide very little benefit. The pump will also not be operating efficiently and will be liable to fail prematurely.

How can I improve my water pressure then?

  • Firstly you must install a break tank which will give your pump a reservoir of water to draw from. For a flat we recommend around a 100 litre tank and for an average family house around a 250 litre tank. The tank does not have to be anything special and anything you can buy from a plumbers merchant is likely to be suitable as long as it has a sealed lid and you can install a ball valve onto the incoming main.
  • This tank should ideally be located as low down and as close to your incoming water supply as possible as the less gravity your incoming water has to overcome, the faster your tank will refill. Although if the loft is the only place that you can install a tank then this will suffice, you may wish to consider installing a slightly larger tank though to reduce the risk of you running out of water. Please note however that we do not recommend installing your pump in the loft.
  • The pumps we use for domestic water pressure boosting are stainless steel centrifugal pumps manufactured by Pedrollo and they are purpose built for this Job. In most cases we recommend the 3CRm80 pump and there is usually only a need for a larger pump if the house has more than 2 storeys or a particularly large number of bathrooms which may be used simultaneously. In these cases we would recommend the 4CRm80

How is my pump controlled?

If all of your outlets are at least a metre below your storage tank then a simple flow-switch such as the FS150 can be used, if as is more common some or all of your outlets are not at least a metre below your storage tank then a BRIO pressure sensing controller should be used, this will turn the pump on when it detects a drop in pressure in your pipe work and stop when the flow stops. Both of these controllers will also protect your pump against dry-running. If you have a particularly large amount of bathrooms which may or may not be used simultaneously then you may wish to consider using the Sirio controller along with the 4CR80 pump. This allows you to set a pressure which you would like to maintain through out the property and will slow down and speed up the pump as more or less outlets are opened to maintain a constant pressure at all of your outlets
.increase water pressure with a 4CR with Sirio

I like the idea but I am looking for something easier and neater to install.

If you are looking for an out of the box solution to your problem which will involve the least amount of additional plumbing and time spent on installation then you may wish to consider one of our all in one pump and tank solutions. They are a packaged water pressure boosting solution and incorporate a Diver 75m or 100m submersible water pump with equivalent performance to the Pedrollo pumps and either a Brio or Sirio controller. All they require is for you to plumb your incoming water main into the float valve entering the tank and from the outlet of the controller to the plumbing in your house.

water pressure tank

If you would like to discuss your system or require help in selecting the best pump please call us on 01633 244777 to discuss the options or e-mail us using