Name: WaterBoost WB-INT Slimline 500 Variable Speed 2409310
Brand: WaterBoost
SKU: wbkslimline-500-variable
Price: 1341.3 GBP
Availability: InStock

WaterBoost WB-INT Slimline 500 Variable Speed 2409310

WaterBoost WB-INT Slimline 500 Variable Speed 2409310 - Image 2

WaterBoost WB-INT Slimline 500 Variable Speed 2409310 - Image 4

WaterBoost WB-INT Slimline 500 Variable Speed 2409310 - Image 5

WaterBoost WB-INT Slimline 500 Variable Speed 2409310 - Image 6

In stock

Established 1975
Trusted by thousands of customers

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.

100l/min

Max flow

500L

Tank storage

5bar

Max pressure

5yr

Tank warranty

WiFi · Google · Alexa
WRAS tank & pump
Internal pump
Direct mains
Pre-assembled
3yr pump warranty

Full Description

More about this product

Full Description

Product overview

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.

500^L

Tank storage

100^l/min

Max flow

5^bar

Max pressure

5^yr

Tank warranty

Tank & pump WRAS approved · Direct mains · Pre-assembled

What’s included

DAB Esybox Diver pump

Internal variable speed pump — submerged inside the tank. Up to 100 l/min, 5 bar max. Built-in WiFi (DConnect app), Google Home, Alexa compatible. Pre-fitted plug. 3-year DAB warranty.

500L slimline tank

WRAS-approved 500-litre upright slimline tank — 700mm dia × 1500mm high. Pre-fitted ¾” ball float valve and By-law 30 kit. Fully pre-assembled. 5-year tank warranty.

Key features

Up to 100 l/min — 5 bar max

Powerful Esybox Diver performance for demanding multi-bathroom properties with high simultaneous outlet use.

Internal pump — submerged in tank

The Esybox Diver sits inside the tank — no external pump unit required. Naturally quieter, compact footprint, and fully protected.

500L in a slimline format

700mm dia × 1500mm high — generous storage in a space-efficient upright format. Fits utility rooms, garages, and plant rooms.

WiFi and voice control

DConnect app for remote monitoring and control. Google Home and Amazon Alexa compatible — “Hey Google, power shower.”

Fully pre-assembled

Arrives ready to install — no site assembly required. Supplied with ¾” ball float valve, By-law 30 kit, and pre-fitted plug.

Tank and pump both WRAS approved

Both components carry WRAS approval — fully compliant for potable water use in the UK.

5-year tank + 3-year pump warranty

5-year warranty on the WRAS slimline tank and 3-year DAB manufacturer warranty on the Esybox Diver pump.

Direct mains connection

Tank fills automatically via the pre-fitted ¾” ball float valve. Minimum 0.5 bar incoming pressure required.

Also available in 300L

The WB-INT Slimline 300 (£1,027.75 + VAT) uses the same Esybox Diver pump in a smaller 600mm × 1200mm tank — ideal where less storage is needed.

Typical applications

High-demand 3–5 bedroom homes

Properties with multiple simultaneous outlets where 500L storage ensures a full tank is available for peak demand.

Slow or restricted mains supply

500L fills overnight on even the slowest mains trickle — the tank is full for peak morning and evening demand.

Utility rooms, garages, plant rooms

700mm diameter fits neatly in standard domestic spaces without structural alterations.

New and existing properties

Arrives fully pre-assembled — easy to install in both new builds and existing properties without specialist access.

Combi boilers and unvented cylinders

Provides the sustained high pressure and flow needed for combi boilers and unvented cylinders at full performance.

Water Regulations compliance

Tank and ball float valve provide the required break between mains and pump — fully compliant with Water Regulations.

Technical specifications

DAB Esybox Diver pump

Max flow rate	100 l/min (6000 l/hr)
Max pressure	5 bar
Pump position	Internal — submerged in tank
Connectivity	WiFi — DConnect app, Google, Alexa
Supply	240V, 50Hz — pre-fitted plug
WRAS	Yes
Warranty	3 years (DAB)

Slimline tank

Capacity	500 litres
Dimensions (dia × H)	700mm × 1500mm
Mains inlet	Direct — ¾” BSP ball float valve
WRAS	Yes — WRAS-approved material
Assembly	Fully pre-assembled
Min inlet pressure	0.5 bar recommended
Warranty	5 years

How it compares

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.

Feature	WB-INT Slimline 500 this product	Powertank SLIMLINE 450 Fixed	Powertank SLIMLINE 450 Variable
Tank capacity	500L WRAS slimline	450L WRAS slimline	450L WRAS slimline
Pump type	Variable speed — internal (Diver)	Fixed speed (Presflo Multi)	Variable speed (Steadypress)
Max flow rate	100 l/min	40 l/min @ 3 bar	80 l/min @ 3 bar
Max pressure	5 bar	3 bar	3 bar
Pressure vessel	Built into pump	Yes — 3L in controller	Yes — 8L external vessel
WiFi / app	Yes — DConnect, Google, Alexa	No	No
Fluid Category	Cat 1–3 (potable)	Up to Cat 4	Up to Cat 4
Tank warranty	5 years	Contact us	Contact us
Pump warranty	3 years (DAB)	Contact us	Contact us
Price (ex VAT)	£1,117.75	£818.55	£1,345.00

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.

Frequently asked questions

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.

Downloads

Delivery Information

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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