WaterBoost Slimline – Fixed Speed
WaterBoost WB-Fixed 500 Litre Slimline 2309310
- Established 1975
- Trusted by thousands of customers
The WaterBoost WB-Fixed 500 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 500-litre WRAS-approved slimline tank (700mm dia × 1500mm 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 required, keeping the footprint to the tank’s 700mm diameter. The tank 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 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
Direct mains
Pre-assembled
3yr pump warranty
3–5 bed homes
More about this product
The WaterBoost WB-Fixed 500 Slimline is the larger fixed-speed model in the WB-Fixed slimline range. A 500-litre WRAS-approved slimline tank (700mm diameter × 1500mm high) pairs with the DAB Dtron2 internal fixed-speed pump, delivering a consistent 50 l/min at 3 bar. Designed for 3–5 bedroom homes where maximum overnight buffer storage is important or mains flow is very slow.
The Dtron2 sits submerged inside the tank — no external pump unit needed. The mains supply connects directly via the pre-fitted ¾” ball float valve. Fully pre-assembled with no site build required. The 700mm diameter tank fits into a standard garage, utility room, or plant room space.
Supplied with ¾” ball float valve and By-law 30 kit. 5-year tank warranty and 3-year DAB Dtron2 pump warranty. Please contact us for delivery timescales.
Three boosting systems in the 450–500L range with fixed-speed pumps. The WB-Fixed 500 is the best-value option — more storage, higher flow, named warranties, and the lowest price of the three. The Powertank 450 Fixed offers Fluid Category 4. The Salamander TankBoost is a different tier entirely — 80 l/min for high-flow applications at a premium price.
Which should I choose?
WB-Fixed 500 Slimline — the best-value fixed-speed option at £786.75 + VAT. More storage (500L vs 450L), higher flow (50 vs 40 l/min), WRAS confirmed, named 5yr tank and 3yr pump warranties, pre-fitted plug — at the lowest price. Ideal for potable water boosting in 3–5 bedroom homes where maximum buffer storage is needed.
Powertank SLIMLINE 450 Fixed — choose for Fluid Category 4 compliance. 450L, 40 l/min. £818.55 + VAT.
Salamander TankBoost 450L — a different tier at £1,512 + VAT. The stainless steel submersible pump delivers 80 l/min — significantly higher flow — and includes an 8L pressure vessel. Note: plug is not supplied (8m cable only), WRAS status is not stated on the product page, and the landscape format (1670 × 600 × 640mm) requires different siting. Choose if 80 l/min is specifically required and the higher price and format suit your installation.
How much does it cost and how is it delivered?
£786.75 + VAT (£944.10 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.
What is the difference between the 300L and 500L WB-Fixed models?
Both use the same DAB Dtron2 pump delivering 50 l/min @ 3 bar. The difference is purely storage. The 300L (£691.65 + VAT, 600mm dia × 1200mm high) suits most 3–5 bedroom homes with a moderate mains fill rate. The 500L (£786.75 + VAT, 700mm dia × 1500mm high) is the better choice if your mains fills very slowly or your daily demand is exceptionally high and you want maximum overnight buffer storage.
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 a strong choice where steady reliable boosting is needed without a premium for added features. Variable speed (the WB-INT Slimline 500 at £1,117.75 + VAT) uses the DAB Esybox Diver — up to 100 l/min, 5 bar max, adjusts to match demand, and includes WiFi, DConnect app, Google Home, and Alexa. Upgrade if higher flow, energy efficiency, or smart home integration are priorities.
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.
You may also need
The WaterBoost WB-INT Slimline 500 is a complete, pre-built variable-speed water boosting system for high-demand 3–5 bedroom homes. A 500-litre WRAS-approved upright slimline tank pairs…
The WaterBoost WB-EXT Slimline 500 Mini3 is a high-storage variable-speed water boosting system for 3–5 bedroom homes. A 500-litre WRAS-approved slimline tank (700mm dia ×…
The WaterBoost WB-Advant 500 Mini3 is a complete variable-speed boosting system designed for larger domestic and light commercial properties. A 500-litre WRAS-approved Advant tank (650mm…
Related products
The WaterBoost WB-Advant 500 Esybox is a high-performance boosting system engineered for larger domestic homes and light commercial applications. A 500-litre WRAS-approved Advant tank (650mm…
The WaterBoost WB-Compact 4.5 (ACM Series) is a compact variable speed inline mains pressure booster — designed to boost your incoming mains supply to up…
The WaterBoost WB-Compact 3.0 is a compact variable speed inline mains pressure booster that connects directly to the incoming mains supply — no tank, no…
Frequently Asked Questions
Quick answers to common questions about the WaterBoost WB-Fixed 500 Litre Slimline 2309310. 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.