WaterBoost Accumulator Vessels
WaterBoost AWB-450LV — 450 Litre Vertical Accumulator Vessel
In stock
- Established 1975
- Trusted by thousands of customers
The WaterBoost AWB-450LV is a 450-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-450LV operates on a 60% usable volume ratio — delivering approximately 270 litres of high-pressure water before returning to normal mains flow. At a typical shower flow of 12 l/min, 270L supports two simultaneous showers for approximately 11 minutes, or three simultaneous showers for approximately 7.5 minutes before returning to normal mains flow. Diaphragm design, WRAS-approved construction, maintenance free. The AWB-450LV is suited to 3 bedroom+ 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.
Maintenance free
Diaphragm design
3 bedroom+ homes
ACF1 pump if <2 bar
More about this product
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-450LV is a 450-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.
Recommended vessel sizes based on property type. All figures use the 60% usable volume rule.
How much does it cost?
£680.00 + VAT (£816.00 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-450LV is suited to 3 bedroom+ and larger properties with higher simultaneous demand. If you have higher demand or more simultaneous outlets, consider our full accumulator range.
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.
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data sheet PDFDownload
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Manual PDFDownload
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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