WaterBoost WB - Advant slim 500 mini3 2103210SL

Name: WaterBoost WB - Advant slim 500 mini3 2103210SL
Brand: WaterBoost
SKU: WBK500mini3sl
Price: 1118.21 GBP
Availability: InStock

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Established 1975
Trusted by thousands of customers

The WaterBoost WB-Advant Slim 500 Mini3 is a compact slimline water boosting system for high-demand domestic properties with tight plant room access. A 500-litre WRAS-approved UK-manufactured Advant slimline tank (500mm W × 1100mm L × 1250mm H) pairs with the DAB Esybox Mini3 external variable speed pump, delivering 50 l/min at 3 bar and up to 5.5 bar maximum — with WiFi, DConnect app, Google Home and Alexa voice control.

At just 500mm wide, the vertical slimline tank passes through even the tightest doorways with 262mm to spare — opening up cellars, loft installs and utility spaces that no standard-footprint 500L tank can reach. The Esybox Mini3 sits alongside the tank for full pump accessibility, running at a quiet 45 dB(A). The tank connects directly to the mains via the pre-fitted ¾” ball float valve, with 1.5” outlet. All interconnecting pipework is supplied — no site assembly required.

The UK-manufactured tank carries an outstanding 10-year warranty and the DAB Esybox Mini3 a 3-year warranty. Delivery is typically 1–2 working days.

50l/min

@ 3 bar

500L

Tank storage

500mm

Slim width

10yr

Tank warranty

262mm doorway clearance
WiFi · Google · Alexa
WRAS tank & pump
5.5 bar max
By-law 30 kit included
Type AB Airgap available
UK-manufactured
1–2 day delivery

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-Advant Slim 500 Mini3 is a compact, high-performance slimline water boosting system combining a 500-litre WRAS-approved slimline storage tank with the DAB Esybox Mini3 variable speed pump. It is engineered for larger domestic properties where high-quality boosted pressure is essential — but the plant room, utility, or install route simply won’t take a wider tank.

At just 500mm wide, the vertical slimline tank clears a standard 762mm internal doorway with an extremely generous 262mm to spare — opening up cellars, loft installs, tight utility rooms and garage spaces that no standard-footprint 500L Advant tank can reach. Capable of delivering 50 l/min at 3 bar, the Esybox Mini3 continuously adjusts its speed to match demand — maintaining consistent pressure across multiple outlets simultaneously while using significantly less energy than fixed-speed alternatives. The external pump is mounted alongside the tank for easy access and servicing.

The tank carries a 10-year warranty and the Esybox Mini3 a 3-year DAB manufacturer warranty. WiFi connectivity via the DConnect app allows remote monitoring, with Google Home and Amazon Alexa voice control. Delivery is typically 1–2 working days.

500^L

Tank storage

50^l/min

Flow @ 3 bar

500^mm

Slim width

45^dB

Pump noise at 1m

Tank WRAS approved · Pump WRAS approved

What’s included

DAB Esybox Mini3 booster pump

Variable speed pump delivering 50 l/min at 3 bar, 5.5 bar max working pressure. Built-in inverter, WiFi (DConnect app), Google Home, Alexa, 45 dB(A). 3-year DAB warranty. Pre-fitted with plug.

500-litre Advant slimline storage tank

WRAS-approved 500-litre slimline Advant tank — 500mm W × 1100mm L × 1250mm H. Pre-fitted with By-law 30 kit (By-law 60 in Scotland), ¾” ball float valve, and 1.5” outlet. UK manufactured, 100% rust-proof, 10-year tank warranty. All interconnecting PVC pipework included. Available in boat blue, black or natural.

Key features

Ultra-slim — 262mm doorway clearance

At just 500mm wide, this is the narrowest tank in the WaterBoost 500L range — passing through standard 762mm doorways with generous 262mm clearance, and even tighter access points where wider tanks cannot go.

500L WRAS-approved tank

100% rust-proof, UK manufactured, 10-year warranty. Suitable capacity for larger domestic properties with typical simultaneous demand.

Variable speed — 50 l/min @ 3 bar

Esybox Mini3 adjusts speed to match demand — constant pressure at every outlet, up to 50% energy saving over fixed-speed systems.

WiFi and voice control

DAB DConnect app for remote monitoring and pressure adjustment. Google Home and Amazon Alexa compatible.

45 dB(A) — quiet operation

Compact, quiet pump suitable for garages and plant rooms close to living areas.

External pump — easy servicing

The Mini3 sits alongside the tank — fully accessible for inspection, adjustment, and replacement without disturbing the tank.

Type AB Airgap available

Optional Type AB Airgap fitting available for Fluid Category 5 protection — suitable for the most stringent water regulations compliance scenarios.

Dual warranty

10-year tank warranty + 3-year DAB manufacturer pump warranty when purchased from Anglian Pumping Services.

Ready to install

Pre-fitted By-law 30 kit (By-law 60 in Scotland), ¾” ball float valve, 1.5” outlet, and all tank-to-pump PVC pipework included. Minimal on-site assembly required.

Typical applications

Domestic properties — very tight access

3–4 bedroom homes where the plant room, utility, or install route can’t take even a 600mm-wide tank — the 500mm slim opens up almost anywhere.

Retrofits & refurbishments

Replacing older cold-water storage where original access has been walled up, narrowed, or modified — and any wider tank simply can’t get in.

Loft & cellar installs

Loft hatches and cellar staircases where the physical opening constrains the maximum tank width — the 500mm profile is designed to squeeze through.

Water Regulations compliance

The break tank arrangement ensures full compliance where direct mains boosting is not permitted. Optional Type AB Airgap adds Fluid Category 5 protection.

Low or intermittent mains supply

500L stores water overnight or during off-peak periods for reliable delivery during morning and evening peaks.

Utility rooms & airing cupboards

Where the storage location is dictated by existing pipework and there’s no chance of squeezing a wider tank into position.

Technical specifications

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, Google, Alexa
Supply	240V, 50Hz — pre-fitted plug
WRAS	Yes
Warranty	3 years (DAB)

Storage tank

Capacity	500 litres
Dimensions (W × L × H)	500mm × 1100mm × 1250mm
Material	WRAS-approved polymer, UV stabilised
Colours	Boat blue, black or natural
Screw lid	255 mm
Outlet	1.5”
Construction	100% rust-proof, UK manufactured
Included	By-law 30 kit (60 in Scotland), ¾” ball float valve, PVC pipework
Optional	Type AB Airgap (Fluid Category 5)
Warranty	10 years

!The Esybox Mini3 cannot connect directly to the mains. The tank must be supplied from the mains water inlet and the pump draws from the tank. In-service weight (filled) is approximately 550kg — confirm floor loading before install.

How it compares

Three Advant Mini3 options to consider — two 500L variants and the larger 1000L Slim upgrade path.

Feature	WB-Advant Slim 500 Mini3 this product	WB-Advant 500 Mini3	WB-Advant Slim 1000 Mini3
Tank width	500mm	650mm	600mm
Doorway clearance (762mm)	262mm	112mm	162mm
Tank capacity	500L	500L	1000L
Tank WRAS	Yes	Yes	Yes
Pump	DAB Esybox Mini3	DAB Esybox Mini3	DAB Esybox Mini3
Flow rate	50 l/min @ 3 bar	50 l/min @ 3 bar	50 l/min @ 3 bar
Max pressure	5.5 bar	5.5 bar	5.5 bar
Type AB Airgap available	Yes — optional	Check	Check
Tank warranty	10 years	10 years	10 years

Which should I choose?
WB-Advant Slim 500 Mini3 — the narrowest option in the range at 500mm wide, ideal where every millimetre of access matters — cellars, lofts, tight utility rooms, and refurbishments where the standard tank simply won’t fit. Same 500L capacity, same Mini3 performance.
WB-Advant 500 Mini3 — the standard-footprint 500L option at 650mm wide. Choose this where access allows a wider tank and cost is the priority.
WB-Advant Slim 1000 Mini3 — step up to 1000L slimline storage (still only 600mm wide) where higher storage buffer matters — larger properties, slow-filling mains, or multi-bathroom demand.

Frequently asked questions

Will this fit through a standard doorway?

At 500mm wide, absolutely — a standard 762mm (30″) internal doorway gives 262mm of clearance. That’s enough to negotiate awkward corners, tight hallway turns, or partially-obstructed access routes. The 1250mm overall tank height also passes under most low soffits comfortably.

What is the Type AB Airgap option?

The Type AB Airgap is an optional fitting that provides Fluid Category 5 protection — the highest level of backflow protection defined by the Water Regulations. It ensures the mains supply cannot be contaminated by any water in the tank under any conceivable failure. Required for the most stringent regulatory scenarios — contact us if you need this specification.

What is the difference between this and the standard WB-Advant 500 Mini3?

Identical pump and identical performance — the only difference is the tank footprint. This slimline version is 500mm wide (150mm narrower than the standard 650mm Advant 500) with a slightly longer 1100mm length. Choose slimline for tight access; choose standard where access allows.

Is 500L enough for my property?

500L is suitable for most 3–4 bedroom domestic properties provided your mains supply refills the tank at a reasonable rate. As a rule of thumb, 500L covers around 15–20 minutes of peak simultaneous demand before refilling. For larger properties, extended off-grid use, or very restricted mains supply, consider the WB-Advant Slim 1000 Mini3. Contact us for sizing advice.

Can it connect directly to the mains?

No — the Esybox Mini3 cannot connect directly to the mains. The mains supply fills the tank via the pre-fitted ball float valve, and the pump draws from the tank. This ensures full compliance with Water Regulations and provides a storage buffer for peak demand periods.

What colour options are available?

The tank is available in boat blue (WaterBoost brand colour), black, or natural as standard. Other colours available on request — contact us for lead times and options.

How does the WiFi and voice control work?

The DAB Esybox Mini3 connects to the DConnect app via built-in WiFi for remote pressure monitoring, adjustment, and fault alerts. 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.

Is the tank WRAS approved?

Yes — the storage tank is manufactured from WRAS-approved polymer and is fully compliant for potable water storage. The DAB Esybox Mini3 pump is also WRAS approved for potable water use.

What warranties are included?

10 years on the storage tank, and 3 years DAB manufacturer warranty on the Esybox Mini3 pump — both 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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Frequently Asked Questions

Quick answers to common questions about the WaterBoost WB – Advant slim 500 mini3 2103210SL. 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.

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