Accumulator Vessels Horizontal
GWS 20 litre accumulator Horizontal PressureWave PWB-20LH
- Established 1975
- Trusted by thousands of customers
Cold water Horizontal accumulator vessels.
Maintenance free and WRAS approved.
- Diaphragm design
- Patened stainless steel water connection
- Virgin polypropylene liner
- Condensation reducing design
- Two-part polyurethane, epoxy primed paint finish
- Max working pressure 10 bar
- Factory pre-charge 1.4 bar
- Max temp 90 degree C
More about this product
With a chlorine resistant 100% butyl diaphragm, incorporating a precision molded polypropylene liner the GWS series tanks offer superior air and water separation.
The CAD-2 diaphragm and liner assembly containing drawdown water are sealed together with a positive lock internal clench ring. An ‘air buffer’ prevents the water chamber from being in contact with the tank wall in order to minimize condensation issues.
Constructed with FDA compliant high-grade butyl and polypropylene, the diaphragm assembly seals water in a true non-corrosive chamber. The air chmaber is sealed with fixed o-ring and closed cell foam which will ensure years of leak free operation and eliminate the need for regular servicing.
The exterior comprises a two-part polyurethane paint finish over an epoxy undercoating which guarantees hundreds of hours of UV and salt spray protection.
All GWS products are quality tested throughout the production process to ensure their structural integrity.
Accumulators are not a new concept and have been used in many applications worldwide such as ships, aircraft, farms and well as commerical pump sets.
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manual PDFDownload
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data sheet PDFDownload
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Dimensions 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 GWS 20 litre accumulator Horizontal PressureWave PWB-20LH. 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.