Name: WaterBoost WB-Coffin 320 Mini3 Variable Speed 2206210
Brand: WaterBoost
SKU: WBKcoffin320mini
Price: 894 GBP
Availability: InStock

WaterBoost WB-Coffin 320 Mini3 Variable Speed 2206210

WaterBoost WB-Coffin 320 Mini3 Variable Speed 2206210 - Image 2

WaterBoost WB-Coffin 320 Mini3 Variable Speed 2206210 - Image 3

WaterBoost WB-Coffin 320 Mini3 Variable Speed 2206210 - Image 4

WaterBoost WB-Coffin 320 Mini3 Variable Speed 2206210 - Image 5

In stock

Established 1975
Trusted by thousands of customers

The WaterBoost WB-Coffin 320 Mini3 is a compact, variable-speed water boosting system engineered to overcome low water pressure or inadequate flow in domestic and light commercial applications. Designed for installations where space is limited, it provides a cost-effective solution while still delivering excellent performance, reliability, and build quality.

The system combines a robust 320-litre WRAS-approved coffin-style tank with the proven DAB Esybox Mini3 booster pump, delivering efficient and consistent pressure boosting of up to 50 litres per minute at 3 bar. This makes it an ideal choice for improving performance to showers, taps, and household appliances without the footprint or complexity of larger boosting systems.

With compact dimensions of 1650mm (L) × 610mm (W) × 500mm (H), the WB-Coffin 320 Mini3 is perfectly suited to installations where height restrictions or access limitations are key considerations. 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

320L

Tank storage

45dB(A)

Ultra quiet

3yr

DAB warranty

WiFi · Google · Alexa
WRAS tank & pump
500mm height
Direct mains
Pipework included
5.5 bar max

Full Description

More about this product

Full Description

Product overview

The WaterBoost WB-Coffin 320 Mini3 is a compact, variable-speed water boosting system designed for installations where height is restricted. The coffin-style tank lies horizontally at just 500mm tall — fitting under stairs, inside low-ceiling cupboards, and in garages or plant rooms where an upright tank would not.

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 320-litre WRAS-approved 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.

320^L

Tank storage

50^l/min

Flow @ 3 bar

500^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.

320L coffin-style tank

WRAS-approved 320-litre horizontal coffin tank — 1650 × 610 × 500mm. 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

Low-profile coffin design

Only 500mm tall — fits under stairs, inside low-ceiling cupboards, and in spaces where an upright tank would not. 1650mm long × 610mm wide.

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 450L

The WB-Coffin range is available in 200L (£635 + VAT) and 450L (£835 + VAT) sizes with the same Mini3 pump.

Typical applications

Under-stairs and cupboard installations

Height restriction makes upright tanks impossible — at 500mm tall the coffin tank fits where standard tanks cannot.

Low-ceiling garages and plant rooms

Maximises usable space in converted garages and low-head plant rooms — 320L capacity with a minimal vertical footprint.

Properties needing more than 200L

Where the 200L WB-Coffin is insufficient for peak demand — 320L provides a larger buffer for 2–4 bathroom properties.

Low mains pressure properties

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

Domestic and light commercial

Suited to homes, flats, and small commercial premises needing reliable boosted pressure with minimal space impact.

Water Regulations compliance

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

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	320 litres
Dimensions (L × W × H)	1650 × 610 × 500mm
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 coffin-format boosting systems in the 320–340L range — all connect directly to mains, all WRAS-approved tanks. The key differences are pump type, flow rate, and features.

Feature	WB-Coffin 320 Mini3 this product	Powertank COFFIN 340 Fixed	Powertank COFFIN 340 Simplicity
Tank capacity	320L WRAS coffin	340L WRAS coffin	340L 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)	£745.00	£980.00	£900.00

Which should I choose?
WB-Coffin 320 Mini3 — the best all-round choice and cheapest of the three at £745 + 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. Note tank is 320L vs 340L for the Powertank options — a negligible real-world difference.
Powertank COFFIN 340 Fixed — choose for Fluid Category 4 compliance or where a commercial-grade fixed-speed system is needed. Includes an integrated 3L pressure vessel. £980 + VAT.
Powertank COFFIN 340 Simplicity — budget Fluid Category 4 option at £900 + 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?

£745.00 + VAT (£894.00 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 340 options?

All three connect directly to mains and use WRAS-approved coffin tanks in the 320–340L range. The WB-Coffin 320 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 (£745 vs £900–£980 + 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 the same 50 l/min at 3 bar. The choice is purely about storage capacity. The 200L (£635 + VAT) suits 1–2 bathroom properties with a reasonable mains fill rate. The 320L (£745 + VAT) provides a larger buffer for 2–4 bathroom properties or where the mains fills slowly. The 450L (£835 + VAT) is suitable for larger households or where storage demand is consistently high. 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 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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