WaterBoost – Coffin
WaterBoost WB-Coffin 450 Mini3 Variable Speed 2207210
- 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.
WRAS tank & pump
580mm height
Direct mains
Pipework included
5.5 bar max
More about this product
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.
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.
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.
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.
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Esybox Mini3 PDFDownload
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Data Sheet PDFDownload
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Manual PDFDownload
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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Frequently Asked Questions
Quick answers to common questions about the WaterBoost WB-Coffin 450 Mini3 Variable Speed 2207210. For technical specifications, see the product details above; for sizing or installation advice, contact our team. If you have any other questions, we're happy to help.
What is a mains pressure boosting system?
A mains pressure boosting system increases the pressure and flow of water from the incoming mains supply into a property. It typically combines a pump and a storage or expansion tank, drawing water from the mains and delivering it to taps, showers and appliances at a stronger, more consistent pressure. They are used where the incoming mains is too weak to serve modern outlets reliably.
When do I need a mains booster pump?
You normally need a mains booster if static mains pressure is below 1.5 to 2 bar, if showers run weakly when other taps are open, or if combi boilers struggle to deliver hot water. Anglian Pumping recommends checking static pressure at the stop tap before specifying a system, then choosing a model rated for the number of bathrooms and outlets in the property.
What size mains booster do I need for my home?
Sizing depends on the number of bathrooms, the type of fittings and the static mains pressure. As a guide, a 1 to 2 bathroom property with combi boiler or single shower often needs 1.6 to 3 bar boost. A 2 to 3 bathroom property typically needs 3 to 4.5 bar with an integral break tank. Larger homes need a tank-and-pump system such as the DAB Esybox with Esytank or a Powertank set.
What is a water booster pump?
A water booster pump increases the pressure of an existing water supply to give stronger flow at taps, showers and appliances. It can be a small inline pump fitted to the incoming mains, or a larger pump and tank set that draws from a break tank to feed the whole house. Boosters do not create water – they raise the pressure of the water already coming in.
What is the difference between an inline booster and a tank-and-pump booster?
An inline booster connects straight onto the incoming mains and is limited to 12 litres per minute under UK water regulations – examples include the Salamander HomeBoost and WaterBoost WB-Compact. A tank-and-pump booster, such as the Grundfos Home Booster or DAB Esybox with Esytank, draws from a break tank and can deliver much higher flow rates for larger homes with multiple bathrooms.
What is a variable speed booster pump?
A variable speed booster uses an inverter to adjust pump speed in real time to match demand. It maintains constant pressure as outlets open and close, runs more quietly than a fixed-speed pump and typically saves up to 50 per cent of the energy a fixed-speed equivalent would use. The DAB Esybox, DAB Esybox Mini 3 and Grundfos Scala2 are common variable speed examples.