Name: WaterBoost WB-EXT Slimline 300 Esybox Variable Speed 2502110
Brand: WaterBoost
SKU: GROUP-slimline300esybox
Price: 1222.8 GBP
Availability: InStock

WaterBoost WB-EXT Slimline 300 Esybox Variable Speed 2502110

WaterBoost WB-EXT Slimline 300 Esybox Variable Speed 2502110 - Image 2

WaterBoost WB-EXT Slimline 300 Esybox Variable Speed 2502110 - Image 4

Established 1975
Trusted by thousands of customers

The WaterBoost WB-EXT Slimline 300 Esybox is a high-performance variable-speed boosting system for 3–4 bedroom homes combining a 300-litre WRAS-approved slimline tank (600mm dia × 1200mm high) with the DAB Esybox external variable speed pump. Delivering 80 l/min at 3 bar — with WiFi, DConnect app, H2D technology, Google Home and Alexa voice control — it is the most capable system in the WB-EXT slimline range.

The Esybox sits alongside the tank rather than inside it, keeping the pump fully accessible for servicing at any time. Running at just 43 dB(A), it is exceptionally quiet for an 80 l/min pump. The tank connects directly to the mains via the pre-fitted ¾” ball float valve. Fully pre-built — no site assembly required. At 600mm diameter, the tank fits through a standard doorway.

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 a 3-year warranty. Please contact us for delivery timescales.

80l/min

@ 3 bar

300L

Tank storage

43dB(A)

Ultra quiet

3yr

Pump warranty

WiFi · Google · Alexa
WRAS tank & pump
6.5 bar max
External pump
Pre-assembled
5yr tank warranty

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-EXT Slimline 300 Esybox is the highest-performing system in the WB-EXT slimline range. A 300-litre WRAS-approved slimline tank (600mm dia × 1200mm high) pairs with the DAB Esybox external variable speed pump, delivering 80 l/min at 3 bar and up to 6.5 bar maximum. Designed for 3–4 bedroom homes with demanding simultaneous water use and poor mains pressure.

The Esybox sits alongside the tank for full pump accessibility at all times — running at 43 dB(A), an exceptionally low noise level for an 80 l/min system. WiFi via the DConnect app and H2D technology enable remote monitoring and intelligent pressure management. Google Home and Alexa voice control included. The mains connects directly via the pre-fitted ¾” ball float valve. Fully pre-built — no site assembly required. The 600mm tank fits through a standard doorway.

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

80^l/min

Flow @ 3 bar

300^L

Tank storage

6.5^bar

Max pressure

43^dB

Noise (1m)

WRAS tank & pump · Direct mains · Pre-assembled

What’s included

DAB Esybox pump

External variable speed pump — sits alongside the tank. 80 l/min @ 3 bar, 6.5 bar max, 43 dB(A). WiFi via DConnect app and H2D, Google Home, Alexa. 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. ¾” ball float valve, 600mm hose, 2× union connections, 1″ pre-fitted tank outlet, By-law 30 kit. 5-year warranty.

Key features

80 l/min @ 3 bar

Full DAB Esybox performance — 80 l/min with variable speed to match demand across multiple simultaneous outlets.

WiFi, H2D, Google and Alexa

DConnect app for remote monitoring. H2D technology enables intelligent pump-to-pump communication. Voice control via Google Home and Alexa.

Exceptionally quiet — 43 dB(A)

43 dB(A) at 1 metre — an outstanding noise level for a pump delivering 80 l/min. Suitable for under-stair and utility room installations.

External pump — easy servicing

Esybox sits alongside the tank — pump is fully accessible for inspection or replacement without tank disturbance at any time.

Fits through a standard doorway

600mm diameter tank passes through a standard UK doorway pre-assembled. Install under stairs, in a garage, or utility room.

WRAS approved — potable water

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

5yr tank + 3yr pump warranty

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

Direct mains connection

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

Also in 500L

The WB-EXT Slimline 500 Esybox (£1,084 + VAT) provides 500L storage with the same Esybox pump for higher-demand properties.

Typical applications

3–4 bedroom homes with demanding demand

80 l/min at 3 bar handles simultaneous use across multiple showers, hot water systems, and appliances at full flow.

New and existing properties

600mm diameter passes through a standard doorway pre-assembled — suitable for both new builds and retrofit installations.

Where pump access matters

External pump layout means the Esybox is always accessible for inspection, servicing, or replacement — no tank disturbance required.

Under stairs, garage, utility room

43 dB(A) pump and compact upright format make it suitable for noise-sensitive indoor locations.

Combi boilers and unvented cylinders

High flow and pressure ensure combi boilers and unvented cylinders operate at full performance even at peak demand.

Smart home integration

WiFi, DConnect app, H2D, Google Home, and Alexa — “Hey Google, power shower” or “sleep mode” at night.

Technical specifications

DAB Esybox pump

Flow rate	80 l/min @ 3 bar
Max pressure	6.5 bar
Pump type	Variable speed — external
Noise	43 dB(A) at 1m
Connectivity	WiFi · DConnect · H2D · 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-built
Min inlet pressure	0.5 bar recommended
Warranty	5 years

How it compares

Three 80 l/min boosting systems with DAB Esybox-class performance. All feature variable speed and WiFi. The WB-EXT 300 Esybox is the most affordable, with WRAS confirmation and a standard doorway-width tank. The Powertank offers Fluid Category 4 and more storage. The DAB Esytank is a purpose-built DAB integrated system with 275L of useable storage.

Feature	WB-EXT 300 Esybox this product	Powertank SLIMLINE 350 Variable	DAB Esytank 300 with Esybox
Tank storage	300L WRAS upright	350L WRAS upright	275L useable (Esytank 300 model)
Pump	DAB Esybox — external	Steadypress M/T — external	DAB Esybox — integrated
Flow @ 3 bar	80 l/min	80 l/min	80 l/min
Max pressure	6.5 bar	3 bar	6.5 bar
WiFi / app	Yes — DConnect, H2D, Google, Alexa	No	Yes — DConnect, H2D, Google, Alexa
Noise	43 dB(A)	Not stated	43 dB(A)
WRAS	Yes — tank & pump	Yes — Cat 4	Not stated on product page
Fluid Category	Cat 1–3 (potable)	Up to Cat 4	Not stated
Tank warranty	5 years	Contact us	Contact us
Pump warranty	3 years (DAB)	Contact us	3 years (DAB)
Price (ex VAT)	£1,019.00	£1,305.00	£1,209.00

Which should I choose?
WB-EXT 300 Esybox — the best-value choice at £1,019 + VAT. The same DAB Esybox pump as the Esytank system, with 300L WRAS-confirmed storage, 6.5 bar max, 43 dB(A), WiFi and voice control, named 5yr tank and 3yr pump warranties — and the lowest price of the three. Fits through a standard doorway. The right choice for most potable water boosting applications.
Powertank SLIMLINE 350 Variable — choose for Fluid Category 4 compliance with 350L storage. Note: 80 l/min but 3 bar max (not 6.5), no WiFi. £1,305 + VAT.
DAB Esytank 300 with Esybox — the same Esybox pump in DAB’s own purpose-built integrated system. 275L useable storage (slightly less than the WB-EXT’s 300L). WRAS status not stated on product page. At £1,209 + VAT it is £190 more than the WB-EXT. Choose if you specifically want the pure DAB Esytank ecosystem — for example, to link additional Esytank storage units using the DAB coupling kit.

Frequently asked questions

How much does it cost and how is it delivered?

£1,019.00 + VAT (£1,222.80 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.

What is the difference between this and the WB-EXT 300 Mini3?

Both are 300L EXT systems with the pump sitting alongside the tank, but the pump differs significantly. The WB-EXT 300 Mini3 (£680 + VAT) uses the Esybox Mini3 — 50 l/min @ 3 bar, 5.5 bar max, 45 dB(A). This system uses the full Esybox — 80 l/min @ 3 bar, 6.5 bar max, 43 dB(A), H2D technology. Choose the Mini3 for moderate-demand homes where 50 l/min is sufficient; choose the Esybox for high-demand properties needing 80 l/min.

What is H2D technology?

H2D (Hydraulic to Digital) is DAB’s technology that enables multiple Esybox pumps to communicate with each other wirelessly and work as a coordinated system. If two Esybox pumps are installed together (for example, the EsyTwin system), H2D ensures they balance load automatically without additional wiring between them.

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 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 there a 500L version with the Esybox?

Yes — the WB-EXT Slimline 500 Esybox (£1,084 + VAT) uses the same external Esybox pump with a larger 500L tank (700mm dia × 1500mm high). Choose the 500L if you need maximum overnight buffer storage or have a very slow-filling mains supply.

What warranties are included?

5 years on the WRAS slimline tank and 3 years DAB warranty on the Esybox pump, when purchased from Anglian Pumping Services.

Downloads

Data Sheet PDF
Download
Esybox Tech PDF
Download

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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