WaterBoost WB-Coffin 450 Mini3 Variable Speed 2207210

WaterBoost WB-Coffin 450 Mini3 Variable Speed 2207210 - Image 4

WaterBoost WB-Coffin 450 Mini3 Variable Speed 2207210 - Image 5

WaterBoost WB-Coffin 450 Mini3 Variable Speed 2207210 - Image 6

Established 1975
Trusted by thousands of customers

The WaterBoost WB-Coffin 450 Mini3 is a compact, variable-speed water boosting system engineered to overcome low water pressure or restricted flow in domestic and light commercial applications. Designed for installations where space is limited, it delivers a cost-effective solution while maintaining excellent performance, reliability, and build quality.

The system combines a durable 450-litre WRAS-approved coffin-style tank with the proven DAB Esybox Mini3 booster pump, providing efficient and consistent pressure boosting of up to 50 litres per minute at 3 bar. This makes it ideal for improving water performance across showers, taps, and appliances without the complexity or footprint of larger boosting systems.

With compact dimensions of 1680mm (L) × 696mm (W) × 580mm (H), the WB-Coffin 450 Mini3 is perfectly suited to installations where height restrictions or access limitations are key considerations, such as garages, cupboards, and plant rooms. The tank is supplied pre-fitted with a By-law 30 kit and ½” ball valve, and all interconnecting pipework is included as standard.

50l/min

@ 3 bar

450L

Tank storage

45dB(A)

Ultra quiet

3yr

DAB warranty

WiFi · Google · Alexa
WRAS tank & pump
580mm height
Direct mains
Pipework included
5.5 bar max

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-Coffin 450 Mini3 is the largest capacity coffin-format boosting system in the WB-Coffin range. At just 580mm tall, the horizontal coffin tank still fits under stairs, inside low-ceiling cupboards, and in garages and plant rooms where an upright tank would not — while providing 450 litres of WRAS-approved storage.

The mains supply connects directly to the tank via the pre-fitted ½” ball float valve. The DAB Esybox Mini3 variable speed pump draws from the tank, delivering a consistent 50 l/min at 3 bar. The Mini3’s intelligent speed control adjusts continuously to match demand — maintaining stable pressure across multiple outlets simultaneously with low noise and reduced running costs.

Supplied complete with By-law 30 kit, ½” ball float valve, and all interconnecting pipework. WiFi via the DConnect app, Google Home, and Alexa compatible. 3-year DAB pump warranty. Please contact us for delivery timescales.

450^L

Tank storage

50^l/min

Flow @ 3 bar

580^mm

Tank height

45^dB

Pump noise at 1m

Tank & pump WRAS approved · Direct mains connection

What’s included

DAB Esybox Mini3 pump

Variable speed pump delivering 50 l/min at 3 bar, 55m max head, 5.5 bar max working pressure. Built-in inverter, expansion vessel, WiFi (DConnect app), 45 dB(A). 3-year DAB warranty.

450L coffin-style tank

WRAS-approved 450-litre horizontal coffin tank — 1680 × 696 × 580mm. Connects directly to mains via pre-fitted ½” ball float valve and By-law 30 kit. All tank-to-pump PVC pipework included.

Key features

450L in a low-profile format

The largest capacity WB-Coffin — 450 litres at just 580mm tall. Fits where upright tanks cannot while providing substantial storage for high-demand households.

Direct mains connection

Tank connects directly to mains via pre-fitted ½” ball float valve and By-law 30 kit. Minimum 0.5 bar inlet pressure required.

Variable speed — 50 l/min @ 3 bar

DAB Esybox Mini3 adjusts continuously to match demand — constant pressure with lower energy use than fixed-speed systems.

WiFi and voice control

DConnect app for remote monitoring and control. Google Home and Amazon Alexa compatible — “Hey Google, power shower.”

45 dB(A) — ultra quiet

Water-cooled DAB Mini3 motor in sound-absorbing housing. Suitable for spaces close to living areas.

Tank and pump both WRAS approved

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

Complete and ready to install

By-law 30 kit, ½” ball float valve, and all interconnecting PVC pipework included. No additional fittings required.

3-year DAB pump warranty

3-year manufacturer warranty on the Esybox Mini3 when purchased from Anglian Pumping Services.

Also available in 200L and 320L

The WB-Coffin range is available in 200L (£635 + VAT) and 320L (£745 + VAT) sizes with the same Mini3 pump and the same 50 l/min @ 3 bar performance.

Typical applications

High-demand properties with height restrictions

4+ bathroom properties needing maximum storage capacity where an upright tank won’t fit — 450L in a low-profile format.

Slow or intermittent mains supply

450L provides a generous overnight fill buffer — ideal where the mains trickle-fills slowly so the tank is ready for peak morning demand.

Low-ceiling garages and plant rooms

580mm height allows installation where other 450L tanks would not fit — maximises storage in constrained spaces.

Domestic and light commercial

Suited to homes, small B&Bs, and light commercial premises needing reliable boosted pressure across multiple simultaneous outlets.

Low mains pressure properties

Stores and boosts to 3 bar — consistent pressure to showers, taps, combi boilers, and unvented cylinders.

Water Regulations compliance

The tank and ball float valve provide the break between mains and pump, ensuring full compliance with Water Regulations.

Technical specifications

Esybox Mini3 pump

Flow rate	50 l/min @ 3 bar
Max head	55 metres
Max working pressure	5.5 bar
Noise	45 dB(A) at 1m
Connectivity	WiFi — DConnect app, Google, Alexa
WRAS	Yes
Warranty	3 years (DAB)

Coffin tank

Capacity	450 litres
Dimensions (L × W × H)	1680 × 696 × 580mm
Mains inlet	Direct mains — ½” BSP ball float valve
WRAS	Yes — WRAS-approved material
Included	By-law 30 kit, ½” ball float valve, PVC pipework
Min inlet pressure	0.5 bar recommended

How it compares

Three 450L coffin-format boosting systems — all connect directly to mains, all WRAS-approved tanks. The key differences are pump type, flow rate, and features.

Feature	WB-Coffin 450 Mini3 this product	Powertank COFFIN 450 Fixed	Powertank COFFIN 450 Simplicity
Tank capacity	450L WRAS coffin	450L WRAS coffin	450L WRAS coffin
Mains connection	Direct — ½” ball float valve	Direct — ½” ball float valve	Direct — ½” ball float valve
Pump type	Variable speed (DAB Mini3)	Fixed speed (Presflo Multi)	Fixed speed (Presflo)
Flow rate @ 3 bar	50 l/min	40 l/min	40 l/min
Integrated pressure vessel	Yes — in pump	Yes — 3L in controller	No — external vessel required
WiFi / app	Yes — DConnect, Google, Alexa	No	No
Fluid Category	Cat 1–3 (potable)	Up to Cat 4	Up to Cat 4
Pump warranty	3 years (DAB)	Contact us	1 year
Price (ex VAT)	£835.00	£975.00	£905.00

Which should I choose?
WB-Coffin 450 Mini3 — the best all-round choice at the lowest price (£835 + VAT). Higher flow (50 vs 40 l/min), variable speed efficiency, WiFi and voice control, 3-year warranty. Best for domestic and light commercial potable water use with height restrictions.
Powertank COFFIN 450 Fixed — choose for Fluid Category 4 compliance or where a commercial-grade fixed-speed system is needed. Includes an integrated 3L pressure vessel. £975 + VAT.
Powertank COFFIN 450 Simplicity — budget Fluid Category 4 option at £905 + VAT, but no integrated pressure vessel — one must be purchased separately. Only 1-year warranty.

Frequently asked questions

How much does it cost and how is it delivered?

£835.00 + VAT (£1,002.00 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.

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 and acts as a storage buffer. The Esybox Mini3 draws from the tank and boosts pressure throughout the property. A minimum of 0.5 bar incoming pressure is required for the standard fill valve.

What is the difference between this and the Powertank COFFIN 450 options?

All three share a 450L WRAS coffin tank and connect directly to mains. The WB-Coffin 450 Mini3 uses the DAB Esybox Mini3 variable speed pump — delivering higher flow (50 vs 40 l/min), WiFi and voice control, and a 3-year warranty at the lowest price (£835 vs £905–£975 + VAT). The Powertank COFFIN systems use fixed-speed pumps and are rated to Fluid Category 4 for non-potable water applications. The Simplicity has no integrated pressure vessel and requires one to be purchased and fitted separately.

Should I choose the 200L, 320L, or 450L WB-Coffin?

All three use the same DAB Esybox Mini3 pump and deliver 50 l/min at 3 bar. The choice is purely about storage capacity. The 200L (£635 + VAT) suits 1–2 bathroom properties. The 320L (£745 + VAT) provides a larger buffer for 2–4 bathrooms or a slow-filling mains. The 450L (£835 + VAT) is the largest low-profile option, suited to 4+ bathroom homes or properties with consistently high demand. Contact us if you’re unsure which size is right.

How does the WiFi work?

The Esybox Mini3 connects to the DConnect app via built-in WiFi for remote pressure monitoring and control. It also works with Google Home and Amazon Alexa — “Hey Google, power shower” to boost pressure, or “Hey Google, sleep mode” to reduce it at night.

What warranty is included?

3 years DAB manufacturer warranty on the Esybox Mini3 pump when purchased from Anglian Pumping Services.

Downloads

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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