WaterBoost – Coffin
WaterBoost WB-Coffin 320 Esybox Variable Speed 2206110
- Established 1975
- Trusted by thousands of customers
The WaterBoost WB-Coffin 320 Esybox 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 provides a cost-effective solution while still delivering exceptional reliability, performance, and build quality.
The system combines a durable 320-litre WRAS-approved coffin-style tank with the proven DAB Esybox booster pump, delivering efficient and consistent pressure boosting of up to 80 litres per minute at 3 bar. This makes it ideal for properties requiring enhanced performance across showers, taps, and appliances without the footprint or complexity of larger boosting systems.
With compact dimensions of 1650mm (L) × 610mm (W) × 500mm (H), the WB-Coffin 320 Esybox is perfectly suited to installations where height restrictions or limited access are key considerations, including garages, cupboards, and plant rooms.
For added convenience, the tank is supplied pre-fitted with a By-law 30 kit and ½” ball valve, and all interconnecting pipework is included as standard — ensuring installation is swift, clean, and straightforward. Energy-efficient operation is delivered through the Esybox’s advanced variable-speed control, providing smooth, stable pressure while helping to minimise running costs.
WRAS tank & pump
500mm height
Direct mains
Pipework included
6.5 bar max
More about this product
The WaterBoost WB-Coffin 320 Esybox brings the full performance of the DAB Esybox pump to a space-saving coffin format. The 320-litre WRAS-approved coffin tank sits horizontally at just 500mm tall — fitting under stairs, in low-ceiling garages, and in plant rooms where upright tanks will not — while the Esybox delivers a powerful 80 l/min at 3 bar.
The mains supply connects directly to the tank via the pre-fitted ½” ball float valve. The DAB Esybox variable speed pump draws from the tank and continuously adjusts its speed to match demand — maintaining consistent pressure across multiple simultaneous outlets with minimal energy use and one of the lowest noise levels in its class at 43 dB(A).
WiFi via the H2D app, Google Home, and Alexa compatible. Supplied complete with By-law 30 kit, ½” ball float valve, and all interconnecting pipework. 3-year DAB pump warranty. Please contact us for delivery timescales.
Three coffin-format boosting systems in the 320–340L range — all connect directly to mains, all WRAS-approved tanks. The WB-Coffin 320 Esybox and the Powertank 340 Variable Speed both deliver 80 l/min; the key difference is price, WiFi, and Fluid Category.
Which should I choose?
WB-Coffin 320 Esybox — the best all-round choice for potable water at £1,069 + VAT. Delivers the same 80 l/min as the Powertank Variable Speed but costs £621 less, adds WiFi and voice control, and carries a 3-year warranty. Ideal for larger domestic homes and light commercial properties needing high flow with height restrictions.
Powertank COFFIN 340 Fixed — the lowest-cost option at £980 + VAT but flow is only 40 l/min. Choose if Fluid Category 4 compliance is needed and flow demand is modest.
Powertank COFFIN 340 Variable — same 80 l/min as the WB-Coffin Esybox with Fluid Category 4 compliance, but at £1,690 + VAT — £621 more than the WB-Coffin Esybox, with no WiFi. Choose only if Fluid Category 4 is a requirement.
How much does it cost and how is it delivered?
£1,069.00 + VAT (£1,282.80 inc VAT). Please contact us via WhatsApp or phone for delivery timescales on this product.
What is the difference between the Esybox and the Esybox Mini3?
The Esybox is the larger, higher-performance pump — delivering 80 l/min @ 3 bar, 65m head, 6.5 bar max, and 43 dB(A). The Esybox Mini3 delivers 50 l/min @ 3 bar, 55m head, 5.5 bar max, and 45 dB(A). Both include WiFi and voice control. Choose the Esybox for larger homes with higher simultaneous demand, or the Mini3 for 1–3 bathroom properties where 50 l/min is sufficient.
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 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.
Why is this so much cheaper than the Powertank Variable Speed?
Both deliver 80 l/min at 3 bar from a similar coffin tank. The WB-Coffin 320 Esybox (£1,069 + VAT) uses the DAB Esybox pump with WiFi, voice control, and a 3-year warranty. The Powertank COFFIN 340 Variable Speed (£1,690 + VAT) uses a Steadypress controller with an 8L pressure vessel and is rated to Fluid Category 4 — meaning it can be used for non-potable water applications. If you only need potable water boosting, the WB-Coffin Esybox delivers the same performance at a significantly lower price.
How does the WiFi and voice control work?
The DAB Esybox connects to the H2D app via built-in WiFi for remote pressure monitoring, adjustment, and fault alerts. It also integrates with Google Home and Amazon Alexa — say “Hey Google, power shower” to boost pressure, or “Hey Google, sleep mode” to quieten it at night.
Is there an Esybox coffin system available in other sizes?
If you need a smaller tank with the same Esybox performance, the WB-Coffin 320 Mini3 (£745 + VAT) uses the Mini3 pump delivering 50 l/min in the same coffin format. If 80 l/min is needed from a non-coffin format, the WB-Advant 1000 Esybox provides 1000L storage with the same Esybox pump.
What warranty is included?
3 years DAB manufacturer warranty on the Esybox pump when purchased from Anglian Pumping Services.
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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