Name: WaterBoost WB-EXT Slimline 150 Mini3 Variable Speed 2501210
Brand: WaterBoost
SKU: GROUP-slimline-150
Price: 750 GBP
Availability: InStock

WaterBoost WB-EXT Slimline 150 Mini3 Variable Speed 2501210

WaterBoost WB-EXT Slimline 150 Mini3 Variable Speed 2501210 - Image 2

WaterBoost WB-EXT Slimline 150 Mini3 Variable Speed 2501210 - Image 3

Established 1975
Trusted by thousands of customers

The WaterBoost WB-EXT Slimline 150 Mini3 is a compact, variable-speed water boosting system combining a 150-litre WRAS-approved slimline tank (600mm dia × 650mm high) with the DAB Esybox Mini3 external pump. Delivering 50 l/min at 3 bar, it brings variable speed performance, WiFi, and voice control to a highly practical low-profile format — ideal for 1–2 bedroom homes where space is restricted.

The Esybox Mini3 sits alongside the tank rather than inside it, providing easy access for servicing and maintenance. The tank connects directly to the mains via the pre-fitted ¾” ball float valve, and the system arrives fully pre-built. At just 650mm tall, it fits under kitchen units, in low cupboards, and in spaces where taller systems cannot.

Supplied with union connections, ¾” ball float valve, 600mm hose, and By-law 30 kit. The tank carries a 5-year warranty and the DAB Esybox Mini3 a 3-year warranty. Please contact us for delivery timescales.

50l/min

@ 3 bar

150L

Tank storage

45dB(A)

Ultra quiet

3yr

Pump warranty

WiFi · Google · Alexa
WRAS tank & pump
Only 650mm tall
Variable speed
Direct mains
5yr tank warranty

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-EXT Slimline 150 Mini3 brings the performance of the DAB Esybox Mini3 to a compact, low-profile tank system. The 150-litre WRAS-approved tank sits at just 650mm tall — fitting under kitchen units, in low cupboards, and in spaces where taller systems cannot — while the external Mini3 delivers 50 l/min at 3 bar with variable speed efficiency. Designed for 1–2 bedroom homes where space is tight but performance matters.

Unlike internal-pump systems, the Mini3 sits neatly alongside the tank. This makes it easy to access for servicing, and means the pump benefits from the full Esybox Mini3 feature set — WiFi via the DConnect app, Google Home and Alexa voice control, and variable speed speed adjustment to match demand. The mains connects directly via the pre-fitted ¾” ball float valve. Fully pre-built, no site assembly required.

5-year tank warranty and 3-year DAB pump warranty. Please contact us for delivery timescales.

50^l/min

Flow @ 3 bar

150^L

Tank storage

650^mm

Tank height

45^dB

Pump noise

WRAS tank & pump · Direct mains · Pre-assembled

What’s included

DAB Esybox Mini3 pump

External variable speed pump — sits alongside the tank. 50 l/min @ 3 bar, 5.5 bar max, 45 dB(A), built-in WiFi (DConnect app), Google Home, Alexa. Pre-fitted plug. 3-year DAB warranty.

150L slimline tank

WRAS-approved 150-litre upright slimline tank — 600mm dia × 650mm high. Direct mains via ¾” ball float valve and By-law 30 kit. Includes 600mm connection hose, 2× union connections, 1″ pre-fitted tank outlet. 5-year warranty.

Key features

Only 650mm tall

One of the most compact tank heights available — fits under kitchen units, in low cupboards, and in spaces where no taller system would fit.

50 l/min @ 3 bar — variable speed

DAB Esybox Mini3 adjusts continuously to match demand — stable pressure, lower energy use than fixed-speed, and 45 dB(A) operation.

WiFi and voice control

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

External pump — easy servicing

The Mini3 sits alongside rather than inside the tank — fully accessible for servicing and replacement without disturbing the tank.

Direct mains connection

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

WRAS approved — potable water

Both tank and pump carry WRAS approval — fully compliant for potable water use in the UK.

Fully pre-built

Arrives ready to install — no site assembly required. Supplied with union connections, ¾” ball float valve, 600mm hose, and By-law 30 kit.

5yr tank + 3yr pump warranty

5-year warranty on the WRAS slimline tank and 3-year DAB warranty on the Esybox Mini3 pump.

Need more storage or flow?

The WB-EXT Slimline 300 Mini3 (£680 + VAT) offers 300L in the same external Mini3 format. For 80 l/min, the WB-EXT Slimline 300 or 500 Esybox is available.

Typical applications

1–2 bedroom homes

Smaller properties with light to moderate demand — 50 l/min @ 3 bar provides excellent pressure across a shower and multiple taps simultaneously.

Extremely low headroom spaces

Only 650mm tall — fits under kitchen units, in very low loft spaces, and shallow cupboards where no taller system would be viable.

Where easy pump access matters

External pump layout means the Esybox Mini3 is always accessible for inspection, servicing, or replacement without tank disturbance.

New and existing properties

Pre-assembled and compact — suitable for both new builds and retrofits in existing properties without specialist access.

Smart home integration

WiFi, DConnect app, Google Home, and Alexa voice control — “Hey Google, sleep mode” at night to reduce running noise and pressure.

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 Mini3 pump

Flow rate	50 l/min @ 3 bar
Max pressure	5.5 bar
Pump type	Variable speed — external
Noise	45 dB(A) at 1m
Connectivity	WiFi — DConnect app, Google, Alexa
WRAS	Yes
Warranty	3 years (DAB)

Slimline tank

Capacity	150 litres
Dimensions (dia × H)	600mm × 650mm
Mains inlet	Direct — ¾” BSP ball float valve
WRAS	Yes — WRAS-approved material
Assembly	Fully pre-built
Min inlet pressure	0.5 bar recommended
Warranty	5 years

How it compares

Three compact boosting systems for smaller properties. The WB-EXT Mini3 is the cheapest, has more storage, higher flow than the Compact Fixed, and adds WiFi and variable speed. The Powertank COMPACT units are rated to Fluid Category 5 and have a washing-machine-sized form factor that hides behind a cupboard door.

Feature	WB-EXT 150 Mini3 this product	Powertank COMPACT 125 Fixed	Powertank COMPACT 125 Variable
Format	Low cylinder (600mm dia × 650mm H) + external pump	Compact unit (~washing machine)	Compact unit (~washing machine)
Tank capacity	150L WRAS	125L WRAS	125L WRAS
Pump type	Variable speed (DAB Mini3 — external)	Fixed speed (Presflo 1.5 — external)	Variable speed (Steadypress — external)
Flow rate @ 3 bar	50 l/min	40 l/min	65 l/min
WiFi / app	Yes — DConnect, Google, Alexa	No	No
Fluid Category	Cat 1–3 (potable)	Up to Cat 5	Up to Cat 5
Tank warranty	5 years	Contact us	Contact us
Pump warranty	3 years (DAB)	Contact us	Contact us
Price (ex VAT)	£625.00	£815.00	£1,355.00

Which should I choose?
WB-EXT Slimline 150 Mini3 — the best overall choice for potable water boosting at £625 + VAT. More storage (150L vs 125L), higher flow than the Compact Fixed (50 vs 40 l/min), variable speed, WiFi and voice control, named 5yr tank and 3yr pump warranties. Excellent for 1–2 bedroom homes needing low-profile installation with smart features.
Powertank COMPACT 125 Fixed — choose if Fluid Category 5 compliance is required, or if the square washing-machine form factor suits your installation space better than a cylinder + external pump. 40 l/min. £815 + VAT.
Powertank COMPACT 125 Variable — highest flow in this group at 65 l/min with Fluid Category 5 compliance. At £1,355 + VAT it is the most expensive. Choose only if Cat 5 and 65 l/min are both specifically required.

Frequently asked questions

How much does it cost and how is it delivered?

£625.00 + VAT (£750.00 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.

What does “EXT” mean — why is the pump external?

“EXT” stands for external pump. Rather than sitting submerged inside the tank (as in the WB-INT and WB-Fixed ranges), the DAB Esybox Mini3 is mounted alongside the tank. This means the pump is always accessible for inspection, servicing, or replacement without any need to access the inside of the tank. It also means the pump benefits from all the Esybox Mini3’s features including WiFi, voice control, and variable speed — at a lower price point than equivalent internal variable speed systems.

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 acts as a storage buffer. The Esybox Mini3 draws from the tank via the 600mm connection hose and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required.

Is 150L enough storage for my home?

For 1–2 bedroom homes with moderate demand, 150L is typically sufficient — it fills overnight from even a restricted mains supply and provides a good morning buffer. For a 2–3 bathroom property or where mains flow is very slow, the WB-EXT Slimline 300 Mini3 (£680 + VAT) provides 300L in the same external format. Contact us if you’d like help choosing the right size.

How does the WiFi work?

The Esybox Mini3 connects to the DConnect app via built-in WiFi for remote pressure monitoring and control. It also integrates with Google Home and Amazon Alexa — say “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 warranty on the Esybox Mini3 pump, when purchased from Anglian Pumping Services.

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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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