AccuBoost Unvented 330L

A mains fed system is one which is fed directly by the mains water such as a combination boiler or an unvented hot water cylinder.

Measuring the water flow is an important step in choosing the right pump. Water flow rate is measured in litres per minute (L/min).

To measure the water flow rate, you will need a measuring jug and a timer.

1. Hold the measuring jug under the outlet which will be boosted.
2. Turn the outlet onto fully hot or cold (depending on which is to be boosted).
3. Measure the water in the jug after 10 seconds, in litres.
4. Multiply the amount of water by 6 to measure the number of litres per minute.

For example, if you gathered 600ml in 10 seconds, to calculate the flow rate in litres per minute – 600 x 6 = 3600ML per minute = 3.6L/min.

You can also use our interactive flow calculator to work out the flow rate of a single outlet.

Learn how to measure your water flow from the video.

An AccuBoost accumulator vessel can be installed in a system with an incoming mains pipe in any material.

If the system has a high pressure (over 2.0 bar) but has a restricted main, then AccuBoost accumulator may still offer a solution – contact us for more information.

A sign of a restricted mains supply pipe would be a high standing pressure and low flow rate.

No. To prevent stagnant water and debris build up the accumulator vessel must be installed vertically.

An AccuBoost accumulator stores both air and water within the vessel. The accumulator’s capacity is shared 50% air and 50% water, therefore a 450L accumulator will store approximately 226.5 litres of water.

The volume of water stored in the accumulator will vary depending on the pre-charge pressure held in the bladder of the vessel.

It’s impossible to say what flow rate will be delivered from the outlet as aspects of the system, such as the size of pipe work and how restrictive the outlet is, will impact the flow rate delivered from the outlet.

See ‘What are the flow rates from each accumulator in an open-ended test?’ for the flow rates delivered directly from the accumulator, excluding system factors.