WaterBoost WB-INT Slimline 300 Variable Speed 2402310

WaterBoost WB-INT Slimline 300 Variable Speed 2402310 - Image 4

WaterBoost WB-INT Slimline 300 Variable Speed 2402310 - Image 5

WaterBoost WB-INT Slimline 300 Variable Speed 2402310 - Image 6

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Established 1975
Trusted by thousands of customers

The WaterBoost WB-INT Slimline 300 is a complete, pre-built variable-speed water boosting system designed to solve low water pressure and flow in 3–5 bedroom homes. Combining a 300-litre WRAS-approved upright slimline tank with the DAB Esybox Diver internal variable speed pump, it delivers up to 100 litres per minute at up to 5 bar — all in a slimline format that fits through a standard doorway.

The Esybox Diver sits inside the tank, making the system exceptionally quiet and compact. It connects directly to the mains via the pre-fitted ¾” ball float valve, and WiFi connectivity via the DConnect app enables remote monitoring and voice control via Google Home and Amazon Alexa.

At 600mm diameter × 1200mm high, the Slimline tank is ideal for fitting under stairs, in a garage, or in a utility room. It arrives fully pre-assembled — no site assembly required. 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

300L

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 300 is a complete, pre-assembled variable-speed boosting system for 3–5 bedroom homes with low mains pressure or restricted flow. A 300-litre WRAS-approved upright slimline tank pairs with the DAB Esybox Diver — an internal variable speed pump that sits submerged inside the tank itself, making this one of the most compact and quiet systems available.

Capable of up to 100 l/min and 5 bar, the Esybox Diver continuously adjusts speed to match demand across multiple simultaneous outlets. With built-in WiFi, it connects to the DConnect app for remote monitoring and works with Google Home and Amazon Alexa. The mains supply connects directly via the pre-fitted ¾” ball float valve.

At 600mm diameter × 1200mm high, the tank fits through a standard doorway — no disassembly required. Install it under stairs, in a garage, or in a utility room. 5-year tank warranty. 3-year DAB pump warranty. Please contact us for delivery timescales.

300^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.

300L slimline tank

WRAS-approved 300-litre upright slimline tank — 600mm dia × 1200mm high. Fits through a standard doorway. Pre-fitted ¾” ball float valve and By-law 30 kit included. 5-year tank warranty.

Key features

Up to 100 l/min — 5 bar max

The Esybox Diver provides exceptional performance for demanding 3–5 bedroom properties with multiple simultaneous outlets.

Internal pump — submerged in tank

The Esybox Diver sits inside the tank itself — no external pump unit, ultra-compact footprint, and naturally quieter operation.

Fits through a standard doorway

600mm dia × 1200mm high — designed to pass through a standard doorway without disassembly. Under stairs, garage, or utility room.

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. Connect mains in, boosted water out. Supplied with ¾” ball float valve and By-law 30 kit.

Tank and pump both WRAS approved

Both tank and pump 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 500L

The WB-INT Slimline 500 (£1,117.75 + VAT) provides 500 litres of storage with the same Esybox Diver pump for higher-demand properties.

Typical applications

3–5 bedroom homes

Where floor space is limited but high flow and pressure are needed across multiple simultaneous outlets.

New and existing properties

The slimline format fits through a standard doorway — no specialist access required for installation in existing properties.

Under stairs, garage, utility room

600mm diameter fits neatly in standard household spaces without requiring structural alterations.

Combi boilers and unvented cylinders

Provides the mains pressure needed for combi boilers and unvented cylinders to operate at full output.

Slow or intermittent mains supply

300L fills overnight so the tank is full for peak morning and evening demand even on a restricted mains supply.

Water Regulations compliance

Tank and ball float valve provide the 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	300 litres
Dimensions (dia × H)	600mm × 1200mm
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 slimline-format upright boosting systems — all connect directly to mains, all WRAS-approved tanks. The WB-INT 300 has 50% more storage than the Powertank Slimline 200 options, higher performance, WiFi, and stronger warranties at a mid-range price.

Feature	WB-INT Slimline 300 this product	Powertank SLIMLINE 200 Fixed	Powertank SLIMLINE 200 Variable
Tank capacity	300L WRAS slimline	200L WRAS slimline	200L 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)	£1,027.75	£744.60	£1,270.00

Which should I choose?
WB-INT Slimline 300 — the best overall choice at £1,027.75 + VAT. More storage (300L vs 200L), higher flow (100 l/min vs 80), higher max pressure (5 bar vs 3 bar), WiFi and voice control, and a 5-year tank warranty — at £242 less than the Powertank Variable Speed.
Powertank SLIMLINE 200 Fixed — lowest cost at £744.60 + VAT. Choose if Fluid Category 4 compliance is required and flow demand is modest (40 l/min). 200L storage only.
Powertank SLIMLINE 200 Variable — Fluid Category 4 with 80 l/min variable speed, but costs £242 more than the WB-INT with 100L less storage, lower max pressure, and no WiFi. Choose only if Cat 4 compliance is a firm requirement.

Frequently asked questions

How much does it cost and how is it delivered?

£1,027.75 + VAT (£1,233.30 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.

What is the Esybox Diver and how is it different from an external pump?

The Esybox Diver is a variable speed pump designed to sit submerged inside the storage tank. This means there is no separate external pump unit — the entire system is contained within the slimline tank footprint. The submerged position makes it inherently quieter and protects the pump from environmental dust and moisture. It still includes WiFi, DConnect app, Google Home, and Alexa connectivity.

Will it fit through my doorway?

Yes — at 600mm diameter, the tank is designed to fit through a standard UK doorway (760mm minimum clear opening). No disassembly is required on site. If you have a particularly narrow doorway or an awkward access route, please contact us before ordering.

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 and provides a storage buffer. The Esybox Diver draws from the tank and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required.

Is there a larger version available?

Yes — the WB-INT Slimline 500 (£1,117.75 + VAT) provides 500 litres of storage with the same Esybox Diver pump. Choose the 500L if you have a high daily demand or a very slow-filling mains supply.

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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Delivery Information

Standard delivery:

Standard delivery is free for all orders except for some low cost/low margin items where standard delivery is £6.75. Some difficult to transport goods also have a varying carriage charge applied.

Please contact us for the estimated standard delivery times of the products that we have in stock, by dropping us a message on our Whatsapp or Live chat.

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 £15.00 + 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.

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