Name: WaterBoost WB-Fixed 150 Litre Slimline 2301510
Brand: WaterBoost
SKU: wbkslimline-150-dtro
Price: 660.78 GBP
Availability: InStock

WaterBoost WB-Fixed 150 Litre Slimline 2301510

WaterBoost WB-Fixed 150 Litre Slimline 2301510 - Image 3

WaterBoost WB-Fixed 150 Litre Slimline 2301510 - Image 4

Established 1975
Trusted by thousands of customers

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 1–3 bedroom homes. It combines a 150-litre WRAS-approved slimline tank with a DAB Divertron internal fixed-speed pump, delivering 45 l/min at 3 bar.

At just 600mm diameter × 650mm high, this is one of the most compact boosting systems available — fitting in extremely low spaces such as under kitchen units, in shallow plant rooms, or in cupboards where even a standard slimline tank would not fit. The tank connects directly to the mains via the pre-fitted ½” ball float valve and arrives fully pre-assembled.

Supplied complete with ½” ball float valve and By-law 30 kit. The tank carries a 5-year warranty and the DAB Divertron pump a 2-year warranty. Please contact us for delivery timescales.

45l/min

@ 3 bar

150L

Tank storage

650mm

Tank height

5yr

Tank warranty

WRAS tank & pump
Internal pump
Only 650mm tall
Direct mains
Pre-assembled
1–3 bed homes

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-Fixed 150 Slimline is the most compact boosting system in the WaterBoost range. With a 150-litre WRAS-approved tank at just 600mm diameter × 650mm high, it fits in spaces where no other tank-based system will — under low kitchen units, in shallow cupboards, and in plant rooms with minimal headroom. Designed for 1–3 bedroom homes with low pressure or restricted flow.

The DAB Divertron fixed-speed internal pump sits submerged inside the tank, delivering 45 l/min at 3 bar. The mains supply connects directly via the pre-fitted ½” ball float valve. Fully pre-assembled — no site build required.

Supplied with ½” ball float valve and By-law 30 kit. 5-year tank warranty and 2-year DAB pump warranty. Please contact us for delivery timescales.

45^l/min

Flow @ 3 bar

150^L

Tank storage

650^mm

Tank height

5^yr

Tank warranty

Tank & pump WRAS approved · Direct mains · Pre-assembled

What’s included

DAB Divertron pump

Fixed speed internal pump — submerged inside the tank. Delivers 45 l/min at 3 bar. WRAS approved. Pre-fitted plug. 2-year DAB warranty.

150L low-profile slimline tank

WRAS-approved 150-litre upright slimline tank — 600mm dia × 650mm high. Connects directly to mains via pre-fitted ½” ball float valve and By-law 30 kit. Fully pre-assembled. 5-year tank warranty.

Key features

Only 650mm tall

The most compact tank height in the WaterBoost range — fits under kitchen units, in low cupboards, and in spaces where no other system will.

Internal pump — submerged in tank

DAB Divertron sits inside the tank — no external pump unit, smallest possible footprint, and naturally quiet operation.

45 l/min @ 3 bar

Reliable fixed-speed performance for 1–3 bedroom homes — showers, taps, and appliances at consistent 3 bar pressure.

Direct mains connection

Tank fills automatically via the pre-fitted ½” ball float valve. Minimum 0.5 bar incoming pressure required.

Fully pre-assembled

Arrives ready to install — no site assembly required. Supplied with ½” ball float valve and By-law 30 kit.

WRAS approved — potable water

Both tank and pump carry WRAS approval — fully compliant for potable water use in the UK.

5-year tank warranty

5-year warranty on the WRAS slimline tank. 2-year warranty on the DAB Divertron pump.

Cost-effective entry point

The most affordable internal-pump slimline system in the range — reliable fixed-speed performance where a variable speed system is not needed.

Need more height or variable speed?

The WB-INT Slimline 300 (£1,027.75 + VAT) offers 300L, variable speed, WiFi, and 100 l/min in a taller 1200mm format.

Typical applications

1–3 bedroom homes

Smaller properties with moderate simultaneous demand where 45 l/min @ 3 bar provides good pressure across showers, taps, and appliances.

Extremely low headroom spaces

Only 650mm tall — fits under kitchen units, in shallow plant rooms, and in spaces no other tank-based system can occupy.

New and existing properties

Pre-assembled and quick to install in both new builds and existing homes — no specialist access or site assembly needed.

Budget-conscious installations

Where reliable fixed-speed performance at an accessible price is the priority — without the cost premium of variable speed or WiFi.

Slow or restricted mains supply

150L fills overnight as a buffer so the tank is ready for peak morning and evening demand even on a slow mains trickle.

Water Regulations compliance

Tank and ball float valve provide the required break between mains and pump — fully compliant with Water Regulations.

Technical specifications

DAB Divertron pump

Flow rate	45 l/min @ 3 bar
Pump type	Fixed speed — internal (submerged)
Supply	240V, 50Hz — pre-fitted plug
WiFi / app	No
WRAS	Yes
Warranty	2 years (DAB)

Slimline tank

Capacity	150 litres
Dimensions (dia × H)	600mm × 650mm
Mains inlet	Direct — ½” BSP ball float valve
WRAS	Yes — WRAS-approved material
Assembly	Fully pre-assembled
Min inlet pressure	0.5 bar recommended
Warranty	5 years

How it compares

Three compact boosting systems for smaller properties. These serve slightly different form factors — the WB-Fixed is a low-profile cylinder (650mm tall) while the Powertank COMPACT is a squarer washing-machine-sized unit designed to hide behind a cupboard door. The WB-Fixed wins on price, storage, and flow; the Powertank COMPACT options are rated to the higher Fluid Category 5.

Feature	WB-Fixed 150 Slimline this product	Powertank COMPACT 125 Fixed	Powertank COMPACT 125 Variable
Format	Low cylinder (600mm dia × 650mm H)	Compact unit (~washing machine)	Compact unit (~washing machine)
Tank capacity	150L WRAS	125L WRAS	125L WRAS
Pump type	Fixed speed (DAB Divertron — internal)	Fixed speed (Presflo 1.5 — external)	Variable speed (Steadypress — external)
Flow rate @ 3 bar	45 l/min	40 l/min	65 l/min
Pressure vessel	None (fixed speed — not needed)	Yes — 2L	Yes — 2L
Fluid Category	Cat 1–3 (potable)	Up to Cat 5	Up to Cat 5
Tank warranty	5 years	Contact us	Contact us
Pump warranty	2 years (DAB)	Contact us	Contact us
Price (ex VAT)	£550.65	£815.00	£1,355.00

Which should I choose?
WB-Fixed 150 Slimline — the best value option at £550.65 + VAT. More storage (150L vs 125L), higher flow (45 vs 40 l/min), lower price, and a 5-year tank warranty. Ideal for potable water boosting in 1–3 bed homes and the only choice for extremely low headroom installations (only 650mm tall).
Powertank COMPACT 125 Fixed — choose if Fluid Category 5 compliance is required, or if the square compact form factor fits your installation space better than a cylinder. £815.00 + VAT.
Powertank COMPACT 125 Variable — highest flow in this group (65 l/min) with Fluid Category 5 compliance and variable speed. At £1,355.00 + VAT it is significantly more expensive — choose only if Cat 5 and 65 l/min are both required.

Frequently asked questions

How much does it cost and how is it delivered?

£550.65 + VAT (£660.78 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.

How low is 650mm? What will it fit under?

At 650mm high, the tank is roughly the height of a standard kitchen worktop above floor level (worktops are typically 900mm — the tank sits comfortably below with clearance). It can fit under kitchen units, in very low loft spaces, in low-ceiling cupboards, and in shallow plant rooms where a taller system would not be possible. Contact us if you have a specific height constraint to confirm suitability.

What is the difference between the Divertron and the Esybox Diver?

Both sit inside the tank, but the DAB Divertron (used in this system) is a fixed-speed pump — it runs at a constant speed and is simpler, lower cost, and sufficient for most domestic applications. The Esybox Diver (used in the WB-INT Slimline 300 and 500) is a variable speed pump with built-in WiFi, delivering up to 100 l/min and automatically adjusting to match demand. Choose the Divertron for modest flow needs and budget; the Esybox Diver for higher performance and smart home integration.

How does the mains connection work?

The mains supply connects directly to the tank via the pre-fitted ½” ball float valve. The tank fills automatically. The Divertron draws from the tank and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required.

Is this suitable for a 2–3 bathroom property?

The WB-Fixed 150 Slimline is designed for 1–3 bedroom homes with moderate simultaneous demand. At 45 l/min it can handle 2 showers and multiple taps running together, but for larger properties or higher simultaneous demand, the WB-INT Slimline 300 (300L, 100 l/min, variable speed) would be the better choice. Contact us if you’re unsure.

What warranties are included?

5 years on the WRAS slimline tank and 2 years DAB warranty on the Divertron pump, when purchased from Anglian Pumping Services.

Downloads

Data Sheet PDF
Download
Manual PDF
Download

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.

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