WaterBoost Slimline – Variable Speed
WaterBoost WB-INT Slimline 600 (300 + 300) Variable Speed 2402310D
- Established 1975
- Trusted by thousands of customers
The WaterBoost WB-INT Slimline 600 is a twin-tank variable-speed water boosting system for 3–5 bedroom homes with heavier demand. Two 300-litre WRAS-approved slimline tanks (600L combined) are joined by a dedicated link kit, drawn by a single DAB Esybox Diver internal variable speed pump — delivering up to 100 litres per minute at up to 5 bar.
Mains water fills the AUX tank via the pre-fitted ¾” ball float valve and flows through the link kit into the main tank, where the Esybox Diver pump sits submerged and draws off. Water continuously turns over rather than sitting static — no dead-leg, no stagnant corner. WiFi connectivity via the DConnect app enables remote monitoring and voice control via Google Home and Amazon Alexa.
Each tank is 600mm diameter × 1200mm high, so both still fit through a standard doorway individually — combined footprint 1250mm × 600mm installed as a pair. Arrives fully pre-assembled — no site assembly required. Tanks carry a 5-year warranty, the pump a 3-year DAB warranty. Please contact us for delivery timescales.
WRAS tanks & pump
Twin tank link kit
Continuous turnover
Pre-assembled
3yr pump warranty
More about this product
Product overview
The WaterBoost WB-INT Slimline 600 is a twin-tank variable-speed boosting system for 3–5 bedroom homes with heavier demand or a slow-filling mains supply. Two 300-litre WRAS-approved upright slimline tanks — main and AUX — are joined by a dedicated link kit for 600 litres of combined storage, drawn by a single DAB Esybox Diver internal variable speed pump.
Mains water enters the AUX tank via the pre-fitted ¾” ball float valve and flows through the link kit into the main tank, where the Esybox Diver sits submerged and draws off. As the pump depletes the main tank, water flows through from AUX to replace it — the stored volume continuously turns over rather than sitting static, with no dead-leg or stagnant corner.
The Esybox Diver delivers up to 100 l/min and 5 bar, with built-in WiFi for the DConnect app and compatibility with Google Home and Amazon Alexa. Each tank is 600mm diameter × 1200mm high and fits through a standard doorway individually — no disassembly required — with a combined installed footprint of 1250mm × 600mm. Please contact us for delivery timescales.
What’s included
Key features
Typical applications
Technical specifications
Frequently asked questions
Can I get more storage without a second pump?
Yes — the WB-INT Slimline 600 adds a second 300L AUX tank alongside the main tank, connected by a link kit, for 600 litres total storage using the same single Esybox Diver pump. Mains water fills the AUX tank first and flows through to the main tank where the pump draws from, so water keeps circulating rather than sitting static.
How does the mains connection work?
Mains supply connects to the AUX tank via the pre-fitted ¾” ball float valve. Water flows through the link kit into the main tank, where the Esybox Diver draws off and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required.
Will it fit through my doorway?
Yes — each tank is 600mm diameter and passes through a standard UK doorway (760mm minimum clear opening) individually, with no disassembly required. Combined installed footprint is 1250mm × 600mm. If you have a particularly narrow doorway or awkward access route, please contact us before ordering.
Does the water go stagnant sitting in two tanks?
No — mains water always enters the AUX tank first and is drawn off from the main tank, so the combined 600L volume continuously turns over rather than sitting static in either tank.
What warranties are included?
5 years on each WRAS slimline tank and 3 years DAB manufacturer warranty on the Esybox Diver pump, when purchased from Anglian Pumping Services.
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DAB Esybox Diver PDFDownload
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Manual 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-INT Slimline 600 (300 + 300) Variable Speed 2402310D. 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.