Name: WaterBoost WB-Compact 3.0 low mains pressure booster
Brand: WaterBoost
SKU: WBCompact3.0
Price: 426 GBP
Availability: InStock

WaterBoost WB-Compact 3.0 low mains pressure booster

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 3

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 4

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 5

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 6

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 7

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 8

WaterBoost WB-Compact 3.0 low mains pressure booster - Image 9

In stock

Established 1975
Trusted by thousands of customers

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 break tank, no overflow. It reacts automatically to low mains pressure, boosting supply to the entire property to up to 3.0 bar at up to 12 l/min. Ideal for combi-boiler homes, unvented cylinders, electric showers, and mixer showers.

The variable speed inverter motor adjusts output to match demand, delivering smooth and stable pressure at a measured 40 dB(A) — quieter than a normal conversation. Built-in WiFi connects to the DConnect app for remote monitoring and control, and supports voice commands via Google Home and Amazon Alexa. Available in straight ¾” BSP and right-angle ¾” BSP connections. A full-bore bypass can be fitted for uninterrupted supply during maintenance.

WRAS compliant. 3-year warranty. For higher maximum pressure, see the WB-Compact 4.5. For a storage-based solution, see the ATX-200.

3.0bar

Max pressure

12l/min

Max flow

40dB(A)

Noise

WiFi
DConnect

App + Voice

WiFi · DConnect · Google · Alexa
Variable speed
Direct mains — no tank
Straight & right-angle BSP
Full-bore bypass
WRAS compliant

Full Description

More about this product

Full Description

What is the WB-Compact 3.0?

The WaterBoost WB-Compact 3.0 is a compact variable speed inline mains pressure booster. It connects directly to your incoming cold water mains supply and reacts automatically whenever mains pressure falls below the pre-set threshold — boosting flow and pressure throughout the property without any break tank, overflow, or additional pipework beyond the two inline connections.

Capable of boosting incoming mains supply to up to 3.0 bar at a flow rate of up to 12 l/min, it is ideal for combi-boiler homes, unvented hot water cylinders, electric showers, and mixer showers. The inverter-driven variable speed motor adjusts output to match the actual demand in real time — maintaining smooth, stable pressure and keeping noise to a measured 40 dB(A).

Built-in WiFi connects to the DConnect app for remote monitoring and control, and supports voice commands via Google Home and Amazon Alexa. Available with straight and right-angle ¾” BSP connections to suit the installation. A full-bore bypass can be installed for uninterrupted supply during maintenance.

3.0^bar

Max pressure

12^l/m

Max flow

40^dB

Noise

WiFi
DConnect

App + Voice

WRAS compliant · 3-year warranty

Key features

Variable speed pump

Inverter-driven variable speed motor adjusts output to match real-time demand, delivering smooth and stable pressure without the pressure surges of a fixed-speed pump, with significantly reduced energy consumption.

40 dB(A) — whisper quiet

A measured 40 dB(A) noise rating — quieter than a normal conversation — makes the WB-Compact 3.0 suitable for installation in under-sink cupboards, utility rooms, and kitchen larders.

WiFi, app & voice control

Built-in WiFi connects to the DConnect app for remote monitoring and control. Supports voice commands via Google Home and Amazon Alexa — including boost mode and night mode.

Straight & right-angle BSP

Available with both straight and right-angle ¾” BSP connections, giving greater flexibility to suit the existing pipework arrangement without additional adaptors.

Full-bore bypass

A full-bore bypass can be installed to maintain an uninterrupted mains supply to the property if the pump ever needs to be taken offline for maintenance.

Wide application compatibility

Suitable for combi-boilers, unvented hot water cylinders, electric showers, and mixer showers — boosting both hot and cold supply across the whole property from a single inline installation.

Technical specifications

Brand / Model	WaterBoost — WB-Compact 3.0
System type	Inline direct mains booster — no tank
Max boost pressure	3.0 bar
Max flow rate	12 l/min
Pump type	Variable speed (inverter controlled)
Noise level	40 dB(A)
Connections	¾” BSP — straight and right-angle options
WiFi / connectivity	Yes — DConnect app, Google Home, Amazon Alexa
Bypass	Full-bore bypass (fittable)
WRAS	WRAS compliant
Warranty	3 years
Suited to	Combi-boiler homes · unvented cylinders · electric & mixer showers

How it compares

Feature	WaterBoost WB-Compact 3.0	Salamander HomeBoost	Stuart Turner Stormboost 47708
System type	Inline — no tank	Inline — no tank	Inline — no tank
Max boost pressure	3.0 bar	1.6 bar	2.5 bar
Max flow rate	12 l/min	12 l/min	12 l/min
Pump type	Variable speed	Fixed speed (brushless)	Fixed speed (induction)
Noise	40 dB(A)	46 dB(A)	Quiet (no dB stated)
WiFi / app control	Yes — DConnect, Google, Alexa	No	No
Connections	¾” BSP straight & right-angle	¾” BSP to 15mm/22mm	Not stated
Bypass	Full-bore (fittable)	Not stated	Integral bypass (patented)
Pump body	PP	Not stated	Brass body & impeller
Anti-vibration hoses	Option available	Not stated	2 hoses included
Dry run protection	Yes	Not stated	Yes
Anti-seize function	Yes	Not stated	Yes
Flow indicator	Via APP	Flow indicator lights	Not stated
WRAS	Approved	Approved	Approved
Warranty	3 years	3 years	5 years

All three are inline direct mains boosters with no storage tank. Actual flow rates are dependent on the incoming mains supply available at the property. WRAS compliant means the product meets water regulations requirements; WRAS approved indicates the product has been formally tested and certified by the Water Regulations Advisory Scheme.

Frequently asked questions

What is the difference between an inline mains booster and an accumulator system?

An inline mains booster like the WB-Compact 3.0 sits directly in the pipe and boosts whatever flow rate the mains supply delivers at that moment. It increases pressure but cannot increase flow beyond what the mains provides. An accumulator booster system (such as the ATX-200) stores a volume of mains water under pressure and can deliver flow rates significantly higher than the mains alone could supply — at the cost of a larger unit and higher price. If your mains pressure is the problem, an inline booster usually solves it. If your mains flow rate is also restricted, an accumulator system is likely a better fit.

Does the WB-Compact 3.0 boost both hot and cold water?

Yes. When installed on the incoming mains supply, the WB-Compact 3.0 boosts both hot and cold water throughout the property — including to combi-boilers and unvented cylinders. It should be installed by a qualified plumber in compliance with Water Regulations.

What is the difference between WRAS compliant and WRAS approved?

WRAS compliant means the product meets the requirements of the Water Supply (Water Fittings) Regulations 1999 and is suitable for connection to the mains supply. WRAS approved means the product has additionally been independently tested and certified by the Water Regulations Advisory Scheme and appears on the WRAS product approval list. Both indicate the product is legally fit for mains connection, though WRAS approval provides an additional layer of independent verification.

What does variable speed mean and why does it matter?

A variable speed (inverter-controlled) pump adjusts its motor speed to match the actual demand at the tap or shower at any given moment. A fixed-speed pump runs at full power whenever it activates regardless of demand, which causes pressure surges, higher energy use, and more noise. Variable speed delivers smoother pressure, lower running costs, and quieter operation — particularly noticeable when only one outlet is open rather than several.

Is a higher pressure version available?

Yes. The WB-Compact 4.5 boosts up to 4.5 bar, suitable for properties requiring higher pressure or where the mains supply can support a higher boost level. For properties where flow rate is also the issue (rather than pressure alone), the ATX accumulator booster range may be a better fit. Contact us if you are unsure which product suits your situation.

Additional Information

Low Water Pressure

Water pressure can vary throughout the day, typically dropping during the morning and evening when demand is highest as more people use water at home.

Pressure is measured in bars, with 1 bar of pressure capable of pushing water to a height of 10 metres within your home. The legal minimum water pressure required at your boundary stop tap is 7 metres head (0.7 bar). However, the WaterBoost WB-Compact 3.0 mains booster pump can significantly increase this, boosting pressure up to 3.0 bar!

If you’re not on a shared supply, your neighbours should experience similar water pressure to yours, provided your homes are of similar height and located at the same distance from the water main. However, water flow can vary individually between properties.

It’s important to distinguish between low water pressure and low water flow. You may have high pressure but still experience a low flow rate, often due to limitations in your private supply pipe. In such cases, an accumulator may be a more effective solution than a booster pump.

Downloads

Delivery Information

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

WaterBoost Mains Booster

WaterBoost WB-Compact 4.5 low mains pressure booster (ACM Series)

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…

View Product

WaterBoost Compact

WaterBoost WB-Compact 3.0 wall dock

WaterBoost WB-Compact 3.0 Wall Dock Designed for effortless installation, the WaterBoost WB-Compact 3.0 Wall Dock provides a clean and professional solution for connecting your booster…

View Product

More about this product

You may also need

Related products