GWS Ultramax
GWS Ultramax 100 litre 25Bar Vertical Vessel UMB-100LV
- Established 1975
- Trusted by thousands of customers
GWS UltraMax 100L 25 Bar Vertical High Pressure Vessel
Featuring the same high-quality, zero-maintenance design as our PressureWave™ series, Max™ and UltraMax™ tanks are built with thicker gauge steel to handle the toughest high-pressure applications.
No matter the application, whether it’s high-pressure water supply, high-pressure flushing, pressure regulation in fire pump and sprinkler systems or protection against pressure surges caused by hydraulic shock and water hammer, industry experts agree that Max and UltraMax tanks are the best solution whenever high-pressure tanks are required.
More about this product
- suitable for many high-pressure applications
- super thick steel construction
- patented stainless steel water connection
- virgin polypropylene liner
- dual layer polyurethane paint finish
- leak-free O-ring sealed air valve
- high-grade butyl diaphragm
- 25 bar pressure
- replaceable tank base
- comprehensive testing
- maintenance-free
-
data sheet 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 Ultramax 100 litre 25Bar Vertical Vessel UMB-100LV. 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.