WaterBoost Accumulator Vessels
WaterBoost 150 Litre Horizontal Accumulator Vessel AWBH-150LH
- Established 1975
- Trusted by thousands of customers
The WaterBoost AWBH-150LH is a 150-litre WRAS-approved horizontal accumulator vessel for mains-connected water systems. The horizontal orientation makes it ideal where headroom is limited — fitting neatly in a loft, cupboard, or plant room on its side. Accumulators store mains water under pressure so you draw instantly at full mains pressure the moment you open a tap or shower, delivering noticeably stronger, more consistent flow even during peak demand periods.
The AWBH-150LH operates on a 60% usable volume ratio — delivering approximately 90 litres of high-pressure water before returning to normal mains flow. At a typical shower flow of 12 l/min, 90L supports one shower for approximately 7.5 minutes before returning to normal mains flow. Diaphragm design, WRAS-approved construction, maintenance free. The AWBH-150LH is suited to 1–2 bedroom homes.
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.
Horizontal — low headroom
Maintenance free
1–2 bedroom homes
ACF1 pump if <2 bar
More about this product
The WaterBoost AWBH-150LH is a 150-litre WRAS-approved horizontal accumulator vessel for mains-connected cold water systems. The horizontal orientation means it installs on its side — ideal for lofts, low-ceiling cupboards, and plant rooms where a vertical vessel would not fit. It stores mains water under pressure so that when you open a tap or shower, water discharges immediately at full mains pressure rather than waiting for the street main to respond.
The vessel operates on a 60% usable volume ratio, delivering 90 litres of high-pressure water per charge before recharging automatically from the mains. Diaphragm design, WRAS-approved construction, maintenance free and completely silent — no pump, no electronics, no servicing required once installed.
Requires a minimum 2 bar static mains pressure. If your pressure is below 2 bar, add the WaterBoost ACF1 boost pump to charge the vessel to the required working pressure.
Recommended vessel sizes for the AWBH horizontal range, based on property type.
How much does it cost?
£416.00 + VAT (£499.20 inc VAT). Please contact us for delivery timescales on this product.
Does the horizontal orientation affect performance?
No. Accumulator vessels perform identically whether oriented vertically or horizontally. The horizontal AWBH range delivers the same pressure, flow, and usable volume as an equivalent vertical AWB vessel of the same capacity.
What mains pressure do I need?
A minimum 2 bar static (resting) mains pressure is required. 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 AWBH-150LH is suited to 1–2 bedroom homes. For higher demand, consider the AWBH-200LH (200L). If headroom allows a vertical installation, the WaterBoost AWB vertical range offers sizes up to 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 — no specialist knowledge required.
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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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Frequently Asked Questions
Quick answers to common questions about the WaterBoost 150 Litre Horizontal Accumulator Vessel AWBH-150LH. For technical specifications, see the product details above; for sizing or installation advice, contact our team. If you have any other questions, we're happy to help.
What is an accumulator tank?
An accumulator tank is a pressurised vessel that connects directly to the mains supply and stores water under pressure. When a tap or shower opens, water discharges immediately from the vessel at full mains pressure rather than drawing only from the street main. This delivers stronger, more consistent flow at peak times. Accumulators have no pump and no moving parts so they are maintenance free and silent.
When should I use an accumulator instead of a pump?
An accumulator is the right solution when static mains pressure is adequate – above 2 bar – but flow is poor or drops during peak demand. It boosts available flow without adding a pump, energy use or noise. If static pressure is below 2 bar, a booster pump is needed instead, or an accumulator combined with a charge pump such as the WaterBoost ACF1.
What size accumulator do I need?
Accumulators are typically sized on a 60 per cent usable rule – a 300 litre vessel delivers around 180 litres of boosted water per cycle. As a guide, a 2 to 3 bedroom home suits a 300 litre vessel such as the GWS GCB-300LV. Larger 4 to 5 bedroom homes or properties with multiple bathrooms typically need 450 to 600 litres. Vertical models save floor space, horizontal models suit lofts and roof spaces.