WaterBoost Slimline – Fixed Speed
WaterBoost WB-Fixed 300 Litre Slimline 2302510
- Established 1975
- Trusted by thousands of customers
The WaterBoost WB-Fixed 300 Slimline is a complete, pre-assembled fixed-speed water boosting system designed as a cost-effective solution to low water pressure or restricted flow in 3–5 bedroom homes. A 300-litre WRAS-approved slimline tank (600mm dia × 1200mm high) pairs with the DAB Dtron2 internal fixed-speed pump, delivering a reliable 50 l/min at 3 bar.
The DAB Dtron2 sits submerged inside the tank — no external pump unit, keeping the footprint to a minimum. The tank fits through a standard doorway (600mm wide) and connects directly to the mains via the pre-fitted ¾” ball float valve. Fully pre-assembled — no site build required.
Supplied with ¾” ball float valve, 600mm connection hose, and By-law 30 kit. The tank carries a 5-year warranty and the DAB Dtron2 pump a 3-year warranty. Please contact us for delivery timescales.
Internal pump
Fits through doorway
Direct mains
Pre-assembled
3yr pump warranty
More about this product
The WaterBoost WB-Fixed 300 Slimline delivers reliable fixed-speed water pressure boosting for 3–5 bedroom homes, at the most accessible price in the standard slimline range. A 300-litre WRAS-approved slimline tank pairs with the DAB Dtron2 internal fixed-speed pump, delivering a consistent 50 l/min at 3 bar.
The Dtron2 sits submerged inside the tank — no external pump unit needed. The 600mm diameter tank fits through a standard doorway and stands 1200mm tall — easily sited under stairs, in a garage, or in a utility room. The mains supply connects directly via the pre-fitted ¾” ball float valve. Fully pre-assembled, no site build required.
Supplied with ¾” ball float valve, 600mm tank-to-pump connection hose, and By-law 30 kit. 5-year tank warranty and 3-year DAB Dtron2 pump warranty. Please contact us for delivery timescales.
Three fixed-speed slimline upright boosting systems. The WB-Fixed 300 is the cheapest of the three, yet has the most storage, the highest flow, and named 5-year tank and 3-year pump warranties. The Powertank SLIMLINE options offer Fluid Category 4 compliance for non-potable applications.
Which should I choose?
WB-Fixed 300 Slimline — the strongest all-round fixed-speed option at the lowest price (£691.65 + VAT). More storage than either Powertank, higher flow (50 vs 40 l/min), internal pump, named 5yr tank and 3yr pump warranties. The right choice for potable water boosting in 3–5 bedroom homes.
Powertank SLIMLINE 200 Fixed — choose if Fluid Category 4 compliance is required and storage and flow requirements are modest. 200L / 40 l/min. £744.60 + VAT.
Powertank SLIMLINE 350 Fixed — choose for Fluid Category 4 with more storage (350L). Still 40 l/min. At £775.00 + VAT it is more expensive than the WB-Fixed 300 with lower flow and no named warranties. Choose only if Cat 4 is required.
How much does it cost and how is it delivered?
£691.65 + VAT (£829.98 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.
What is the DAB Dtron2 and how does it differ from the Esybox Diver?
Both sit submerged inside the tank, but the DAB Dtron2 is a fixed-speed pump — it runs at a constant speed and delivers a consistent 50 l/min @ 3 bar. It’s simpler, lower cost, and carries a 3-year warranty. The Esybox Diver (used in the WB-INT Slimline 300 Variable Speed) is a variable speed pump delivering up to 100 l/min and 5 bar, with built-in WiFi, DConnect app, Google Home, and Alexa. Choose the Dtron2 for reliable fixed-speed performance at a lower cost; the Esybox Diver for maximum performance and smart home integration.
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 Dtron2 draws from the tank and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required.
Should I choose fixed speed or variable speed?
Fixed speed (this product) is simpler, lower cost, and delivers consistent 50 l/min @ 3 bar. It’s an excellent choice where flow demand is moderate and steady. Variable speed (the WB-INT Slimline 300 at £1,027.75 + VAT) adjusts continuously to match demand — more energy-efficient at low demand, quieter at low draw, and capable of significantly higher flow (100 l/min) and pressure (5 bar). Variable speed also includes WiFi and voice control. If budget allows and higher performance is beneficial, the variable speed system is worth considering.
Will it fit through my doorway?
Yes — at 600mm diameter, the tank passes through a standard UK doorway (760mm minimum clear opening) without disassembly. If your access point is particularly narrow, please contact us to confirm suitability.
What warranties are included?
5 years on the WRAS slimline tank and 3 years DAB warranty on the Dtron2 pump, when purchased from Anglian Pumping Services.
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-Fixed 300 Litre Slimline 2302510. 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.