WaterBoost – Advant Slim
WaterBoost WB – Advant slim 1000 Esybox Twin 2104410SL
- Established 1975
- Trusted by thousands of customers
The WaterBoost Advant Slim 1000 Litre (2104410SL) is a dual-pump boosting system engineered for properties where storage capacity matters but the standard 1000-litre tank simply won’t fit. At just 600mm wide, the vertical baffled slimline tank passes through a standard doorway — access into utility rooms, plant rooms and cellar spaces the standard footprint can’t reach.
A 1000-litre WRAS-approved UK-manufactured Advant vertical baffled tank (1250mm L × 600mm W × 1703mm H) pairs with two DAB Esybox pumps in a coordinated twin configuration, delivering 140 l/min at 3 bar and up to 6.5 bar maximum. The two Esybox pumps communicate wirelessly via H2D technology — automatically balancing load and enabling true duty/standby operation. If one pump requires servicing, the other continues to run without interruption.
Both pumps include WiFi via DConnect, Google Home and Alexa voice control, running 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.
WiFi · H2D · Google · Alexa
WRAS tank & pumps
Dual pump redundancy
UK-manufactured tank
Vertical baffled
6.5 bar max
43 dB(A) per pump
1–2 day delivery
More about this product
Overview
The WaterBoost Advant Slim 1000 Litre (2104410SL) is the slimline version of our flagship 1000-litre dual-pump boosting system — engineered specifically for properties where a full-footprint 1000-litre tank simply won’t fit through the door. At just 600mm wide, the vertical baffled slimline tank clears a standard 762mm (30″) doorway with room to spare, opening up utility rooms, plant rooms, cellars and garage installations the standard tank can’t reach.
Storage capacity, pump specification and warranty are identical to the standard WB-Advant 1000 Esybox Twin. You keep the full 1000-litre buffer, the full 140 l/min at 3 bar delivery, the full dual-pump redundancy — and gain a footprint that will actually get into position.
Why the slimline tank matters
The standard 1000-litre Advant tank measures 760mm across its narrowest dimension. UK internal doorways are typically 762mm (30″) — with door frame, that leaves nothing to spare. Countless installations have been delayed, redesigned or downsized because the tank arrived on site and the door refused to cooperate.
The slimline version solves this. By reorienting the tank to a taller, narrower profile (1703mm high, 600mm wide), it passes through:
Always measure before ordering. Doorways, hallways, ceiling heights and turning circles all matter. The 1703mm overall height needs particular attention if the installation route involves low soffits, stairs or a hatch.
How dual-pump operation works
The two DAB Esybox pumps communicate wirelessly via H2D technology. Rather than one pump doing all the work while the other sits idle, the system automatically balances demand across both units — extending service life and providing genuine redundancy.
Specifications
| Product code | 2104410SL |
| Configuration | Dual-pump boosting system with slimline vertical baffled tank |
| Tank capacity | 1000 litres nominal |
| Tank material | MDPE (Matrix Revolve N-307, UV10 stabilised) |
| Tank construction | Rotomoulded, vertical baffled, UK manufactured, WRAS approved |
| Working temperature | Up to 40 °C |
| Pumps | 2 × DAB Esybox — integrated variable speed booster |
| Flow | 140 l/min @ 3 bar (combined) |
| Maximum pressure | 6.5 bar |
| Noise | 43 dB(A) per pump |
| Pump-to-pump comms | DAB H2D wireless |
| Smart control | WiFi, DConnect app, Google Home, Alexa |
| Pipework | All interconnecting pipework included |
| Warranty — tank | 10 years |
| Warranty — pumps | 3 years each |
Dimensions & installation footprint
| Tank length | 1250 mm |
| Tank width key slim dimension | 600 mm |
| Tank overall height | 1703 mm |
| Water level height (shoulder) | 1650 mm |
| Screw lid & rim | Ø 255 mm |
| Lifting lugs | 4 moulded lugs at 0°, 90°, 180°, 270° |
| Base requirement | Firm, flat, fully-supporting concrete or equivalent |
| Delivery lead time | 1–2 working days |
Before you order — measure the route in. Doorway widths, hallway turns, ceiling heights and stair clearances. The 1703mm tank height is the most commonly missed dimension. If any point on the install route is under 1750mm, plan the manoeuvre carefully or ask about our on-site survey option.
Ideal applications
Frequently asked questions
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Esybox Brochure PDFDownload
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Manual PDFDownload
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Data Sheet PDFDownload
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 1000 Esybox Twin 2104410SL. 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.