WaterBoost ATX-250 Accumulator Booster System

WaterBoost ATX-250 Accumulator Booster System - Image 3

WaterBoost ATX-250 Accumulator Booster System - Image 4

WaterBoost ATX-250 Accumulator Booster System - Image 5

WaterBoost ATX-250 Accumulator Booster System - Image 6

WaterBoost ATX-250 Accumulator Booster System - Image 7

Established 1975
Trusted by thousands of customers

The WaterBoost ATX-250 is a fully integrated accumulator booster system that connects directly to the incoming cold water mains. It combines a 250-litre sealed accumulator vessel with a variable speed pump in a single compact unit — automatically boosting both pressure and flow throughout the property the moment a tap or shower is opened. No break tank, no overflow arrangement, just two water connections required.

The system delivers a peak burst flow of up to 45 l/min and up to 24.5 l/min at 3.2 bar for up to 11 minutes — enough for two showers running simultaneously with flow to spare — before settling to a continuous boosted flow of 12 l/min at 3 bar until the vessel recharges. Variable speed inverter technology maintains smooth, stable pressure at a measured 40 dB(A). WiFi via the DConnect app enables remote monitoring and control. Includes dry run protection, anti-seize exercise function, and WRAS-approved pump body materials. A mains bypass can be installed in seconds using 2 clips if the unit ever requires maintenance.

WRAS approved product. Sealed system design — no air contamination. Suited to 2–3 bathroom properties. 5-year tank warranty, 3-year pump warranty. Step down to the ATX-200 or up to the ATX-300.

45l/min

Peak flow

3.2bar

Max pressure

40dB(A)

Noise

5yr tank
3yr pump

Warranty

WiFi · DConnect app
WRAS approved
Variable speed
250L — no overflow
Dry run protection
Anti-seize function
Bypass fits with 2 clips

Full Description

More about this product

Full Description

What is the ATX-250?

The WaterBoost ATX-250 is a fully integrated accumulator booster system that connects directly to your incoming cold water mains supply. It combines a 250-litre sealed accumulator vessel with a variable speed pump in a single compact unit — automatically boosting both pressure and flow throughout the property the moment a tap or shower is opened, with no break tank, no overflow arrangement, and just two water connections required.

The larger 250-litre vessel means the ATX-250 can sustain a boosted flow of 24.5 l/min at 3.2 bar for up to 11 minutes before the vessel recharges — slightly more than the ATX-200, making it better suited to homes with two or more bathrooms in simultaneous use. Peak burst flow is up to 45 l/min at the moment of demand, settling quickly to the sustained boosted flow. Once the stored volume is exhausted, the system continues to deliver a boosted 12 l/min at 3 bar continuously until demand ceases and the vessel refills.

The sealed design eliminates the need for a traditional overflow and the variable speed pump keeps noise to a measured 40 dB(A). WiFi via the DConnect app enables remote monitoring and control. Dry run protection and an anti-seize exercise function are built in, and the pump body uses WRAS-approved materials throughout. If the unit ever requires maintenance, a mains bypass can be installed in seconds using just 2 clips.

45^l/m

Peak burst flow

3.2^bar

Max pressure

40^dB

Noise at 1m

250^L

Accumulator

WRAS approved · 5yr tank · 3yr pump

How it works

1 — Vessel pre-charges from mains

On installation and after each use, the variable speed pump charges the 250-litre accumulator vessel to the set working pressure, storing a ready supply of pressurised water.

2 — Demand triggers instant delivery

The moment a tap or shower opens, the system activates automatically — delivering an immediate burst of up to 45 l/min, then sustaining 24.5 l/min at 3.2 bar for up to 11 minutes.

3 — Continuous flow & recharge

After the stored volume is exhausted, the system continues to deliver a boosted 12 l/min at 3 bar directly from the mains. When demand ends, the vessel recharges automatically ready for the next use.

Two-phase operation. Phase 1 — stored volume: up to 24.5 l/min at 3.2 bar for up to 11 minutes (sufficient for two showers running simultaneously). Phase 2 — continuous mains: 12 l/min at 3 bar until demand ceases. Actual flow rates are dependent on the incoming mains supply available.

Key features

Variable speed pump

Inverter-driven variable speed motor adjusts output to match demand — delivering smooth, stable pressure without the surging of a fixed-speed pump, with significantly lower energy consumption.

40 dB(A) — whisper quiet

Water-cooled motor design keeps noise to a measured 40 dB(A) — quieter than a normal conversation and well suited to kitchen larder or utility room installation.

WRAS approved — pump body materials

The pump body is constructed from WRAS-approved materials, ensuring safe contact with potable water throughout. The complete system carries WRAS product approval.

Dry run protection

Built-in dry run protection prevents pump damage if the system runs without water — an important safeguard during initial installation or in the event of a mains interruption.

Anti-seize exercise function

An automatic anti-seize exercise function periodically runs the pump during periods of low demand — preventing the impeller from seizing during prolonged inactivity.

Mains bypass in seconds

If the unit ever requires maintenance, a mains bypass can be fitted in seconds using just 2 clips — keeping the property on a direct mains supply throughout the service period.

The ATX-250 also features a sealed system design requiring no overflow arrangement, just 2 water connections for installation, and built-in WiFi to the DConnect app for remote monitoring and control.

Technical specifications

Brand / Model	WaterBoost — ATX-250
System type	Integrated accumulator booster system
Connection	Direct mains (2 water connections)
Accumulator capacity	250 litres
Peak burst flow	Up to 45 l/min
Boosted flow (stored volume)	Up to 24.5 l/min at 3.2 bar for up to 11 minutes
Continuous flow (post-discharge)	12 l/min at 3 bar
Max pressure	3.2 bar
Pump type	Variable speed (inverter controlled)
Noise level	40 dB(A)
Pump body	WRAS-approved materials
Dry run protection	Yes
Anti-seize exercise function	Yes
WiFi / connectivity	Yes — DConnect app
Overflow required	No — sealed unit
Maintenance bypass	Fitted in seconds using 2 clips
WRAS approved	Yes — WRAS approved product
Warranty	5-year tank · 3-year pump
Suited to	2–3 bathroom properties · combi-boiler homes

How it compares

Feature	WaterBoost ATX-250	Stuart Turner Stormboost 200
Tank capacity	250 litres	200 litres
Connection type	Direct mains	Direct mains
Peak burst flow	Up to 45 l/min	Up to 22 l/min
Boosted flow (sustained)	24.5 l/min for up to 11 min	22 l/min for up to 11 min
Continuous flow (post-discharge)	12 l/min at 3 bar	12 l/min
Max pressure	3.2 bar	3.2 bar
Pump type	Variable speed	Fixed speed (induction motor)
Noise	40 dB(A)	Quiet (no dB rating stated)
WiFi / app control	Yes — DConnect app	No
Overflow required	No — sealed unit	Standard arrangement
Maintenance bypass	2-clip fit — seconds	Integral bypass
Water connections	2 connections	Anti-vibration hoses included
Dry run protection	Yes	Yes
Anti-seize exercise function	Yes	Yes
Pump body	WRAS-approved materials	Brass body & impeller
WRAS approved	Yes	Yes
Warranty	5yr tank · 3yr pump	3 years

Flow rates are dependent on incoming mains supply. Continuous flow of 12 l/min applies after the stored volume has been exhausted and the system returns to mains-only supply.

Frequently asked questions

What is the difference between the ATX-250 and the ATX-200?

The ATX-250 has a 250-litre accumulator vessel compared to the ATX-200’s 200 litres, and delivers a slightly higher sustained boosted flow of 24.5 l/min compared to 22 l/min. All other specifications — peak burst flow, max pressure, noise level, pump type, WiFi, and warranty — are identical. The ATX-250 is better suited to homes with two or more bathrooms where simultaneous use is more likely. If your property has one bathroom or you’re primarily concerned with one or two showers, the ATX-200 may be sufficient.

What does “peak burst flow of 45 l/min” mean in practice?

The peak burst figure is the maximum instantaneous flow the system can deliver at the moment a tap or shower first opens — drawing simultaneously from the pressurised accumulator vessel. This quickly settles to the sustained boosted flow of 24.5 l/min at 3.2 bar, which the system maintains for up to 11 minutes.

What happens after the 11 minutes of boosted flow?

Once the stored volume in the accumulator has been used, the system continues to supply water directly from the mains at a boosted 12 l/min at 3 bar. When demand stops, the accumulator recharges automatically. Actual flow rates depend on the incoming mains supply available.

How does the maintenance bypass work?

If the unit needs to be taken offline for servicing, a mains bypass can be installed in seconds using just 2 clips. This diverts the supply directly from the mains, keeping the property on running water throughout the maintenance period. No tools or specialist knowledge required.

Is the ATX-250 suitable for a combi-boiler property?

Yes. The ATX-250 is designed for direct mains connection and is well suited to combi-boiler homes, boosting both hot and cold flow throughout the property. Installation should comply with Water Regulations and be carried out by a qualified plumber.

Is a larger version available?

Yes. The ATX-300 offers a 300-litre vessel for properties with higher demand or more bathrooms. The ATX-200 is also available for smaller properties. If you are unsure which size is right, contact us and we will advise.

Delivery Information

Standard delivery:

Standard delivery is free for all orders except for some low cost/low margin items where standard delivery is £6.75. Some difficult to transport goods also have a varying carriage charge applied.

Please contact us for the estimated standard delivery times of the products that we have in stock, by dropping us a message on our Whatsapp or Live chat.

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 £15.00 + 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.

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