WaterBoost WB - Advant slim 500 Esybox Twin 2103410SL

Name: WaterBoost WB - Advant slim 500 Esybox Twin 2103410SL
Brand: WaterBoost
SKU: WBK500esyboxtwinsl
Price: 2884.13 GBP
Availability: InStock

WaterBoost WB - Advant slim 500 Esybox Twin 2103410SL - Image 2

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Established 1975
Trusted by thousands of customers

The WaterBoost WB-Advant Slim 500 Esybox Twin brings dual-pump redundancy and high flow performance to the compact slimline range. A 500-litre WRAS-approved UK-manufactured Advant slimline tank (500mm W × 1100mm L × 1250mm H) pairs with two DAB Esybox pumps in a coordinated Duty/Assist configuration, delivering 140 l/min at 3 bar and up to 6.5 bar maximum — with H2D wireless load balancing, WiFi, DConnect app, Google Home and Alexa voice control.

At just 500mm wide, the slimline tank passes through even the tightest doorways with 262mm to spare — opening up plant rooms, cellars and utility spaces that no standard-footprint 500L twin can reach. The two Esybox pumps communicate wirelessly via H2D technology — automatically balancing load and providing true duty/standby operation. If one pump requires servicing, the other continues to run without interruption. Both run at 43 dB(A) each.

All interconnecting pipework included — no site assembly required. The UK-manufactured tank carries an outstanding 10-year warranty and each DAB Esybox a 3-year warranty. Delivery is typically 1–2 working days.

140l/min

@ 3 bar

500L

Tank storage

500mm

Slim width

10yr

Tank warranty

262mm doorway clearance
Dual pump redundancy
WiFi · H2D · Google · Alexa
WRAS tank & pumps
6.5 bar max
43 dB(A) per pump
By-law 30 kit included
Type AB Airgap available
1–2 day delivery

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-Advant Slim 500 Esybox Twin is a complete, high-performance dual-pump slimline boosting system combining a 500-litre WRAS-approved slimline storage tank with two DAB Esybox variable speed pumps in a coordinated Duty/Assist configuration. It is engineered for larger domestic properties and light commercial applications where continuous water supply matters — but the plant room, utility, or install route can’t take a wider tank.

At just 500mm wide, the slimline tank clears a standard 762mm internal doorway with 262mm to spare — opening up locations no standard-footprint 500L twin can reach. The two Esybox pumps communicate wirelessly via DAB H2D technology, delivering a combined 140 l/min at 3 bar up to 6.5 bar maximum — automatically balancing load, engaging both pumps together at peak demand, and providing true duty/standby redundancy if one pump is removed for service.

The UK-manufactured tank carries an outstanding 10-year warranty and each DAB Esybox a 3-year manufacturer warranty. WiFi via the DConnect app allows remote monitoring; Google Home and Amazon Alexa voice control are supported. Delivery is typically 1–2 working days.

500^L

Tank storage

140^l/min

Combined flow

500^mm

Slim width

43^dB

Per pump at 1m

Tank WRAS approved · Pumps WRAS approved

What’s included

2 × DAB Esybox booster pumps

Two variable speed pumps delivering combined 140 l/min at 3 bar, 6.5 bar max working pressure. Duty/Assist configuration via H2D wireless. Built-in inverter, 2-litre expansion vessel each, WiFi (DConnect app), 43 dB(A). 3-year DAB warranty each. Pre-fitted with plugs.

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. Stainless steel twin-pump mounting frame and 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 twin tank in the WaterBoost range — passing through standard 762mm doorways with generous 262mm clearance.

500L WRAS-approved tank

100% rust-proof, UK manufactured, 10-year warranty. Right-sized storage buffer paired with high-flow twin pumps for peak demand.

Dual pump — 140 l/min @ 3 bar

Two DAB Esybox pumps deliver combined 140 l/min at 3 bar. Variable speed adjusts output to match demand at every outlet, with up to 50% energy saving vs fixed-speed equivalents.

H2D wireless Duty/Assist

The two Esybox pumps communicate wirelessly via DAB H2D technology — automatically balancing load, engaging both together at peak demand, providing true duty/standby fallback.

True redundancy

If one pump fails or is removed for service, the remaining pump continues without interruption. Water supply is never lost during maintenance — critical for tenants, guests and B&B operations.

WiFi and voice control

DAB DConnect app for remote monitoring and pressure adjustment. Google Home and Amazon Alexa compatible — say “Hey Google, power shower” or “sleep mode” to boost or quieten.

43 dB(A) per pump — whisper quiet

Water-cooled motors in sound-absorbing housings. Quiet enough for plant rooms close to living areas, even with both pumps running.

External pumps — easy servicing

Both Esybox units sit alongside the tank on a stainless steel mounting frame — fully accessible for inspection, adjustment, or independent replacement without disturbing the tank.

Ready to install

Pre-fitted By-law 30 kit (60 in Scotland), ¾” ball float valve, 1.5” outlet, stainless steel twin-pump frame, and all tank-to-pump PVC pipework included.

Typical applications

Multi-bathroom properties — narrow access

3–4 bedroom homes with high simultaneous demand where continuous supply matters and the plant room can’t take a wider tank.

B&Bs and holiday lets

Where dual-pump redundancy protects guest experience and a 500L buffer covers peak morning demand from multiple simultaneous outlets.

Retrofits & refurbishments

Replacing older cold-water storage where original access has been walled up, narrowed, or modified — and a full-width twin simply can’t get in.

Small commercial & light HMO

Where redundancy matters for tenant experience but plant room space is tight and doorway access is restricted.

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.

Rural and off-grid properties

Stores water from boreholes or restricted mains and delivers it on demand at consistent high pressure — even if one pump needs service.

Technical specifications

Pump set — 2 × Esybox

Combined flow rate	140 l/min @ 3 bar
Max pressure	6.5 bar
Configuration	Duty/Assist — H2D wireless
Noise	43 dB(A) per pump at 1m
Connectivity	WiFi, H2D, DConnect, Google, Alexa
Supply (each)	240V, 50Hz — pre-fitted plug
WRAS	Yes
Warranty (each)	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, stainless steel twin-pump frame, PVC pipework
Optional	Type AB Airgap (Fluid Category 5)
Warranty	10 years

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

How it compares

The Slim 500 range gives you three pump options on the same slimline 500L tank, plus a step up to 1000L twin storage — identical 10-year tank warranty across all four. The choice comes down to flow requirement, pump redundancy and storage capacity.

Feature	WB-Advant Slim 500 Esybox	WB-Advant Slim 500 Esybox Twin this product	WB-Advant 500 Esybox Twin	WB-Advant Slim 1000 Esybox Twin
Tank width	500mm	500mm	650mm	600mm
Doorway clearance (762mm)	262mm	262mm	112mm	162mm
Tank capacity	500L	500L	500L	1000L
Pumps	1 × DAB Esybox	2 × DAB Esybox	2 × DAB Esybox	2 × DAB Esybox
Combined flow	80 l/min @ 3 bar	140 l/min @ 3 bar	140 l/min @ 3 bar	140 l/min @ 3 bar
Max pressure	6.5 bar	6.5 bar	6.5 bar	6.5 bar
Pump redundancy	Single — H2D-ready	Duty/Assist — true redundancy	Duty/Assist — true redundancy	Duty/Assist — true redundancy
Tank warranty	10 years	10 years	10 years	10 years

Which should I choose?
WB-Advant Slim 500 Esybox — single Esybox in the same slimline 500L tank. 80 l/min at 3 bar. H2D-ready so a second pump can be added later. Choose this for lower cost with an upgrade path.
WB-Advant Slim 500 Esybox Twin — twin Esybox pumps from day one for 140 l/min at 3 bar and true duty/assist redundancy. Choose this for higher simultaneous demand or where continuous supply matters (B&Bs, HMOs, light commercial).
WB-Advant 500 Esybox Twin — the standard-footprint 500L twin at 650mm wide. Choose this where access allows a wider tank and cost is the priority.
WB-Advant Slim 1000 Esybox Twin — step up to 1000L slimline storage where a bigger water buffer matters — larger properties, slow-filling mains, or extended peak demand periods.

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. The pumps arrive separately for installation alongside the tank.

Do both pumps run together, or one at a time?

Both. Under normal demand, load is balanced across the pair to distribute wear. Under peak demand, both engage together to deliver the full 140 l/min. If one is unavailable, the other continues alone with no interruption — giving you true continuous supply during service or in the event of a pump fault.

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 Esybox Twin?

Identical pumps 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.

Do I need 500L or 1000L storage?

500L covers around 3–4 minutes at the twin’s peak 140 l/min combined flow before refilling from mains is required — suitable for most 3–4 bedroom properties where the mains supply refills at a reasonable rate. For larger properties, extended peak demand periods, or very restricted mains supply, step up to the WB-Advant Slim 1000 Esybox Twin for a 1000L buffer.

Can the pumps connect directly to the mains?

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

Can a pump be replaced independently if it fails?

Yes — both Esybox units are external pumps mounted on the stainless steel frame alongside the tank. Either can be disconnected and replaced independently, and the remaining pump continues to run during the changeover.

How does the WiFi and voice control work?

Each DAB Esybox connects to the DConnect app via built-in WiFi for remote pressure monitoring, adjustment, and fault alerts. Both also integrate with Google Home and Amazon Alexa — say “Hey Google, power shower” to boost pressure, or “Hey Google, sleep mode” to quieten at night.

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.

What warranties are included?

10 years on the storage tank, and 3 years DAB manufacturer warranty on each Esybox 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 Esybox Twin 2103410SL. 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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