Name: WaterBoost AWB-300LV — 300 Litre Vertical Accumulator Vessel
Brand: WaterBoost
SKU: AWB300
Price: 505.2 GBP
Availability: InStock

WaterBoost AWB-300LV — 300 Litre Vertical Accumulator Vessel

WaterBoost AWB-300LV — 300 Litre Vertical Accumulator Vessel - Image 2

WaterBoost AWB-300LV — 300 Litre Vertical Accumulator Vessel - Image 3

WaterBoost AWB-300LV — 300 Litre Vertical Accumulator Vessel - Image 4

WaterBoost AWB-300LV — 300 Litre Vertical Accumulator Vessel - Image 5

In stock

Established 1975
Trusted by thousands of customers

The WaterBoost AWB-300LV is a 300-litre WRAS-approved vertical accumulator vessel for mains-connected water systems. Accumulators store mains water under pressure — so when you open a tap or shower, you draw instantly from the vessel at full mains pressure rather than waiting for the mains to respond. The result is a noticeably stronger, more consistent flow from every outlet, even during peak demand.

The AWB-300LV operates on a 60% usable volume ratio — delivering approximately 180 litres of high-pressure water before returning to normal mains flow. At a typical shower flow of 12 l/min, 180L supports two simultaneous showers for approximately 7.5 minutes before returning to normal mains flow. Diaphragm design, WRAS-approved construction, maintenance free. The AWB-300LV is suited to 2–3 bedroom homes and larger properties with higher simultaneous demand.

Requires a minimum 2 bar static mains pressure to operate effectively. If your static pressure is below 2 bar, add the WaterBoost ACF1 accumulator booster pump to charge the vessel to the required working pressure.

300L

Vessel size

180L

Usable output

10bar

Max pressure

WRAS

Approved

WRAS approved
Maintenance free
Diaphragm design
2–3 bedroom homes
ACF1 pump if <2 bar

Full Description

More about this product

Full Description

What is an accumulator?

An accumulator is a large pressurised vessel that connects directly to your mains supply. It stores mains water under pressure — so when you open a tap, shower, or appliance, water discharges immediately from the vessel at full mains pressure rather than drawing directly from the street main. The effect is noticeably stronger, more consistent flow throughout the home, even when multiple outlets are used simultaneously or when street pressure drops during peak demand periods.

Unlike a WaterBoost tank-and-pump system, an accumulator has no pump and no moving parts — it works entirely on mains pressure. This makes it maintenance free and completely silent in operation. It is the right solution when your mains pressure is adequate (above 2 bar static) but flow is poor or inconsistent. If static mains pressure is below 2 bar, a WaterBoost ACF1 boost pump should be added to charge the accumulator to a higher working pressure.

The WaterBoost AWB-300LV is a 300-litre WRAS-approved vertical accumulator — built for domestic cold water installations with a diaphragm design, WRAS-approved construction, and a 10 bar maximum working pressure.

300^L

Vessel size

180^L

Usable output

10^bar

Max pressure

Silent

No pump needed

WRAS approved · Maintenance free · No pump required

How it works

1 — Vessel fills under mains pressure

The accumulator connects to the mains supply and fills automatically. The internal diaphragm compresses as water enters, storing energy as pressure.

2 — Water discharges at full pressure

When a tap or shower opens, pressurised water discharges immediately from the vessel — delivering strong, consistent flow from the very first moment.

3 — Vessel refills from mains

Once demand ceases, the mains refills the vessel automatically. No pumps, no controls, no maintenance — entirely self-managing.

60% usable volume rule. WaterBoost accumulators operate on a 60% usable ratio — multiply the vessel size by 0.6 to find the volume of pressurised water available per cycle. The AWB-300LV delivers 180 litres per charge. At a typical shower flow of 12 l/min, 180L supports two simultaneous showers for approximately 7.5 minutes before returning to normal mains flow.

Key features

WRAS approved

Fully compliant for use with potable (drinking) water in the UK. WRAS approved construction throughout.

Maintenance free

No pump, no electronics, no moving parts outside the diaphragm. Once installed, the vessel operates without servicing.

Diaphragm design

Internal diaphragm separates the pressurised air charge from the water supply, ensuring clean potable water delivery at all times.

10 bar max working pressure

Rated to 10 bar maximum working pressure — well above any domestic mains supply, providing a significant safety margin.

Completely silent operation

No pump means no noise. The accumulator operates in total silence — suitable for any room in the home.

ACF1 compatible

Fully compatible with the WaterBoost ACF1 boost pump for installations where mains static pressure is below 2 bar.

Sizing guide

Recommended vessel sizes based on property type. All figures use the 60% usable volume rule.

Property	Recommended vessel	Usable output
1–2 bedroom home	60L, 100L or 200L	36L, 60L or 120L
2–3 bedroom home	200L, 250L or 300L	120L, 150L or 180L
2–3 bed / 3 bed+ this product	300L or 450L	180L or 270L
3+ bedroom home	300L or 450L	180L or 270L

To calculate your own usage: Multiply vessel size × 0.6 to get usable litres. Divide by your total flow demand to find duration. For example: AWB-300LV delivers 180L usable. With two showers at 12 l/min each, that is approximately 7.5 minutes of simultaneous boosted flow.

Technical specifications

Brand / Model	WaterBoost — AWB-300LV
Vessel capacity	300 litres
Usable output (60% rule)	180 litres per charge
Orientation	Vertical
Max working pressure	10 bar
Internal design	Diaphragm
WRAS approved	Yes — potable water
Maintenance	Maintenance free
Min mains pressure required	2 bar static (resting)

Frequently asked questions

How much does it cost?

£421.00 + VAT (£505.20 inc VAT). Please contact us for delivery timescales on this product.

What is the difference between an accumulator and a WaterBoost tank-and-pump system?

An accumulator connects directly to the mains and stores mains water under pressure — no pump required. It works on the pressure already available from the street main, amplifying its effect at the point of use. The right choice when mains pressure is adequate (2 bar+) but flow is poor or inconsistent. A WaterBoost tank-and-pump system stores a much larger volume in a break tank and uses a pump to boost it to the required pressure — the right choice when mains pressure itself is below 2 bar or where daily volume demands are very high. If in doubt, contact us.

What mains pressure do I need?

A minimum 2 bar static (resting) mains pressure is required for the accumulator to charge and operate effectively. If your static pressure is below 2 bar, add the WaterBoost ACF1 accumulator booster pump to charge the vessel to a higher working pressure.

Should I choose this size or a larger vessel?

The AWB-300LV is suited to 2–3 bedroom homes and larger properties with higher simultaneous demand. If you have higher demand or more simultaneous outlets, consider the AWB-450LV (450L).

Does the accumulator need any ongoing maintenance?

No. WaterBoost accumulators are maintenance free. The pre-charge pressure can be verified periodically using a standard tyre pressure gauge on the Schrader valve and topped up if necessary — a straightforward task requiring no specialist knowledge.

Downloads

data sheet PDF
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Manual PDF
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Delivery Information

Standard delivery:
Standard delivery is free on most orders. Some items may incur a delivery charge depending on weight, size or value. Any applicable charge will be displayed at checkout.

Deliveries will typically be made between 7am and 6pm, Monday to Friday (excluding public holidays).

Next day delivery:
Next working day delivery is available for a £16.50 + VAT delivery charge.

Orders must be placed before 12 noon to qualify for next working day delivery. Orders placed after 12 noon on Thursday but before noon on Friday will be delivered the following Monday. Orders placed after 12 noon on Friday will be delivered on Tuesday.

Pallet/Large/Difficult items:
Some large, heavy or difficult to transport items may incur an additional delivery charge. Please contact us for a delivery quote before ordering.

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