WaterBoost Slimline – Variable Speed
WaterBoost WB-INT Slimline 500 Variable Speed 2409310
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The WaterBoost WB-INT Slimline 500 is a complete, pre-built variable-speed water boosting system for high-demand 3–5 bedroom homes. A 500-litre WRAS-approved upright slimline tank pairs with the DAB Esybox Diver internal variable speed pump, delivering up to 100 litres per minute at up to 5 bar — all within a slimline format designed for standard domestic spaces.
The Esybox Diver sits inside the tank itself — no external pump unit — making the system exceptionally compact and quiet. WiFi via the DConnect app with Google Home and Amazon Alexa voice control included. The tank connects directly to the mains via the pre-fitted ¾” ball float valve and arrives fully pre-assembled.
At 700mm diameter × 1500mm high, the Slimline 500 provides generous storage capacity where floor space is at a premium. The tank carries a 5-year warranty and the pump a 3-year DAB warranty. Please contact us for delivery timescales.
WRAS tank & pump
Internal pump
Direct mains
Pre-assembled
3yr pump warranty
More about this product
The WaterBoost WB-INT Slimline 500 is the larger sibling of the WB-INT Slimline 300 — a complete, pre-assembled variable-speed boosting system combining a 500-litre WRAS-approved upright slimline tank with the DAB Esybox Diver internal pump. Designed for 3–5 bedroom homes with high daily demand or a slow-filling mains supply, it delivers up to 100 l/min at up to 5 bar.
The Esybox Diver sits submerged inside the tank itself — there is no external pump unit — making this one of the most compact and quiet boosting systems available. The mains connects directly via the pre-fitted ¾” ball float valve. Built-in WiFi links to the DConnect app for remote monitoring and works with Google Home and Amazon Alexa.
At 700mm diameter × 1500mm high, the tank fits into a standard utility room, garage, or under-stair space. Fully pre-assembled — no site build required. 5-year tank warranty and 3-year DAB pump warranty. Please contact us for delivery timescales.
Three upright slimline boosting systems in the 450–500L range. The WB-INT 500 has more storage, higher performance, WiFi, and stronger warranties — at a lower price than the Powertank Slimline 450 Variable Speed.
Which should I choose?
WB-INT Slimline 500 — the best overall choice at £1,117.75 + VAT. More storage (500L vs 450L), higher max flow (100 l/min vs 80), higher max pressure (5 bar vs 3 bar), WiFi and voice control, named 5yr tank + 3yr pump warranties — at £227.25 less than the Powertank Variable Speed.
Powertank SLIMLINE 450 Fixed — lowest cost at £818.55 + VAT. Choose if Fluid Category 4 is required and flow demand is modest (40 l/min). 450L storage.
Powertank SLIMLINE 450 Variable — 80 l/min variable speed with Fluid Category 4 compliance, but at £1,345 + VAT — £227.25 more than the WB-INT with 50L less storage, lower max pressure, and no WiFi. Choose only if Fluid Category 4 is a firm requirement.
How much does it cost and how is it delivered?
£1,117.75 + VAT (£1,341.30 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.
What is the difference between the 300L and 500L versions?
Both use the same DAB Esybox Diver pump with identical performance (100 l/min, 5 bar). The difference is purely storage: the 300L (£1,027.75 + VAT, 600mm × 1200mm) suits properties with moderate daily demand or a reasonable mains fill rate. The 500L (£1,117.75 + VAT, 700mm × 1500mm) is the better choice for very high-demand properties or a very slow mains supply where maximum overnight buffer storage is important.
What is the Esybox Diver and why is it inside the tank?
The Esybox Diver is a variable speed pump designed specifically to operate submerged inside the storage tank. This eliminates the need for a separate external pump unit, keeps the total footprint to the tank’s 700mm diameter, and naturally reduces operating noise. It includes built-in WiFi, DConnect app, Google Home, and Alexa connectivity.
How does the mains connection work?
The mains supply connects directly to the tank via the pre-fitted ¾” ball float valve. The tank fills automatically. The Esybox Diver draws from the tank and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required.
How does the WiFi and voice control work?
The Esybox Diver connects to the DConnect app via built-in WiFi for remote monitoring and pressure control. It integrates with Google Home and Amazon Alexa — “Hey Google, power shower” to boost pressure, or “Hey Google, sleep mode” to quieten it at night.
What warranties are included?
5 years on the WRAS slimline tank and 3 years DAB manufacturer warranty on the Esybox Diver pump, when purchased from Anglian Pumping Services.
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DAB Esybox Diver PDFDownload
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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 WB-INT Slimline 500 Variable Speed 2409310. 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 a mains pressure boosting system?
A mains pressure boosting system increases the pressure and flow of water from the incoming mains supply into a property. It typically combines a pump and a storage or expansion tank, drawing water from the mains and delivering it to taps, showers and appliances at a stronger, more consistent pressure. They are used where the incoming mains is too weak to serve modern outlets reliably.
When do I need a mains booster pump?
You normally need a mains booster if static mains pressure is below 1.5 to 2 bar, if showers run weakly when other taps are open, or if combi boilers struggle to deliver hot water. Anglian Pumping recommends checking static pressure at the stop tap before specifying a system, then choosing a model rated for the number of bathrooms and outlets in the property.
What size mains booster do I need for my home?
Sizing depends on the number of bathrooms, the type of fittings and the static mains pressure. As a guide, a 1 to 2 bathroom property with combi boiler or single shower often needs 1.6 to 3 bar boost. A 2 to 3 bathroom property typically needs 3 to 4.5 bar with an integral break tank. Larger homes need a tank-and-pump system such as the DAB Esybox with Esytank or a Powertank set.
What is a water booster pump?
A water booster pump increases the pressure of an existing water supply to give stronger flow at taps, showers and appliances. It can be a small inline pump fitted to the incoming mains, or a larger pump and tank set that draws from a break tank to feed the whole house. Boosters do not create water – they raise the pressure of the water already coming in.
What is the difference between an inline booster and a tank-and-pump booster?
An inline booster connects straight onto the incoming mains and is limited to 12 litres per minute under UK water regulations – examples include the Salamander HomeBoost and WaterBoost WB-Compact. A tank-and-pump booster, such as the Grundfos Home Booster or DAB Esybox with Esytank, draws from a break tank and can deliver much higher flow rates for larger homes with multiple bathrooms.
What is a variable speed booster pump?
A variable speed booster uses an inverter to adjust pump speed in real time to match demand. It maintains constant pressure as outlets open and close, runs more quietly than a fixed-speed pump and typically saves up to 50 per cent of the energy a fixed-speed equivalent would use. The DAB Esybox, DAB Esybox Mini 3 and Grundfos Scala2 are common variable speed examples.