WaterBoost Slimline - Fixed Speed
The WaterBoost Slimline — Fixed Speed (Internal) range is a cost-effective, space-saving solution to low water pressure or flow, built around a reliable fixed-speed internal pump delivering up to 50 l/min at 3 bar. It’s the budget-friendly Slimline option for the customer looking to save on installation cost without compromising on a quality, dependable solution.
Designed for internal installation and a slim footprint that fits through a standard doorway, it slots neatly under the stairs, in a garage or a utility room — ideal where floor space is limited in new or existing properties.
Why choose Slimline Fixed Speed?
Key specifications
| Pump type | Fixed speed — internal |
| Max pressure | 3 bar |
| Max flow | 50 l/min |
| Width | 600 mm (700 mm on the 500 L) — fits through a standard doorway |
| Siting | Internal — under stairs, garage or utility room |
| Best for | Homes with poor mains pressure and limited floor space |
For strong, reliable pressure and flow on a budget — in a footprint that fits indoors — the WaterBoost Slimline Fixed Speed range is the cost-effective choice. Choose your model below.
3 products
The WaterBoost WB-Fixed 150 Slimline is a compact, fixed-speed water boosting system designed as a cost-effective solution to low water pressure or restricted flow in…
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…
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…
Frequently Asked Questions
Quick answers to common questions about the WaterBoost Slimline – Fixed Speed. 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.