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Accumulators, Pump Sets and Water Boosters

Performance of Megaflo unvented water systems rely on a combination of water pressure and flow rate. The legal requirements is for the water undertaker to supply a minimum 1 bar pressure and 9 litres per minute flow rate, at the suppliers stop tap. This was absolutely fine for traditional gravity systems, but will not be suitable for modern mains pressure Megaflo systems.

For Megaflo and other brand unvented hot water systems, manufacturers typically recommend a minimum of 1.5 bar pressure and 20 litres per minute. This would be fine for smaller single bathroom properties, but for properties with multiple bathrooms we would certainly recommend higher pressures and flow rates.
If the water supply cannot keep-up with the water usage during peak times, then one tap may adversely affect another, flushing a toilet may affect someone showering, or it maybe just disappointing performance overall.

Where the mains water supply is insufficient to 'power' an unvented hot water system or cannot deliver the desired performance, then an Accumulator, Pump Set or Water Booster will offer the ideal solution, together with some additional benefits!

Accumulators

Guildford Megaflo Accumulator

Accumulators offer a cost effective way to improve the supply pressures by providing a buffer of stored water. Air within the accumulator contained within a rubber (diaphragm) is compressed by the mains water or charging pump (if necessary). When a tap is opened, the water is forced out of the accumulator to the tap; it can be compared to blowing-up a balloon, and then letting the air out quickly.
Accumulators are an ideal solution for properties where the mains water supply cannot keep-up with the required demand; this is often the case with larger properties where multiple bathrooms may be in-use simultaneously.
Improved performance of a Megaflo or unvented system is often the driving factor for the installation of an accumulator or pump set. In this scenario, the design and installation is a key factor; pipe sizing, components and design will greatly affect the overall performance. Accumulators are modular; they can be added to at a later date (assuming the design and layout allow).

Sizing is important too; An Accumulator can run out of water. It won't do any harm, but when emptied, it will revert back to the original mains supply flow rate until it has re-filled.

 

Boost a Main Accumulator

The video below demonstrates the benefit of an accumulator with a charging pump; the results are extremely impressive! This shows a single shower, and then a second, third and forth are switched on, and the flow reverts to a barely a dribble. Switch on the accumulator, and you instantly have full flow to all four showers. When designed and sized correctly, accumulators can service as many outlets as required.

 

 

Pump Sets

Water Booster Set A pump set is made up of booster pumps, a cold water tank, an accumulator vessel, and some controls. They are ideal for areas with poor or unreliable mains pressure, or where the water supply cannot be made large enough to feed multiple outlets at once.

Water BoosterTypically, two pumps are used to provided duty/assist operation, with both pumps only running together at maximum load. Addtionally, the use of two pumps also allows water to be provided should one pump fail - this is very important. The cold water tank must be sized to provide both hot and cold supplies at maximum use, although a large ball-valve in the cold tank is used to maximise the input from the mains.

The accumulator is essentially a pressure vessel that stores a volume of high pressure water, and prevents the pumps from having to run when someone is only brushing their teeth.

The larger the accumulator, the more water can be drawn without the pumps operating; this helps reduce wear on the pumps and 60 litres is a typical size. The controls provide the duty / assist operation using pressure switches, but will also alternate which pump comes on first to even out the wear, and also provide pump over-ride and protection. Pump sets generate as much water, and pressure as you specify.

Water Boosters

Water Boosters are used to improve the water supply to domestic properties with Megaflo or Unvented hot water systems. These typically consists of a storage tank with one or more pumps to provide a neat and compact solution. Addition storage tanks may be required depending on the usage.

Megaflo Home BoosterGuildford Megaflo Water Booster

Please contact Megaflo Unvented to discuss your requirements or to arrange a free on-site survey.

Call 01252 311003
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