WaterBoost – Coffin
WaterBoost WB-Coffin 500 Esybox Variable Speed 2209310B
- Established 1975
- Trusted by thousands of customers
The WaterBoost WB-Coffin 500 Esybox is a complete variable-speed water boosting system engineered to overcome low water pressure or restricted flow in larger domestic homes and light commercial premises with high simultaneous demand. Designed for installations where headroom is limited, the low-profile coffin format fits where upright tanks cannot — under stairs, inside cupboards, in low-ceiling garages and plant rooms — without sacrificing storage capacity.
The system pairs a 500-litre WRAS-approved coffin-style tank with the DAB Esybox variable-speed pump, delivering 80 l/min at 3 bar and a maximum delivery pressure of 6 bar. The pump’s intelligent inverter adjusts continuously to match demand — constant pressure to multiple outlets, lower energy use than fixed-speed alternatives.
Tank dimensions 2200mm (L) × 600mm (W) × 630mm (H). Supplied pre-fitted with By-law 30 kit, ½” ball float valve and 1″ brass connection. All interconnecting pipework included as standard.
WRAS tank & pump
630mm height
Direct mains
Pipework included
6 bar max
More about this product
The WaterBoost WB-Coffin 500 Esybox is a complete, variable-speed water boosting system designed for installations where height is restricted. The coffin-style tank sits horizontally and stands just 630mm tall — fitting under stairs, inside cupboards, and in low-ceiling garages and 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 variable-speed pump draws from the tank, delivering a consistent 80 l/min at 3 bar. The pump’s intelligent inverter adjusts continuously to match demand, maintaining stable pressure across multiple outlets simultaneously with low noise and reduced energy consumption.
Supplied complete with By-law 30 kit, ½” ball float valve, 1″ brass connection and all interconnecting pipework — ready to install with minimal on-site assembly. WiFi via the DConnect app, Google Home and Alexa compatible. 3-year DAB warranty. Delivery typically 2 to 3 working days.
Two coffin-format water boosting systems with similar tank capacity — both connect directly to mains, both WRAS-approved tanks. The key differences are pump performance, smart features and warranty.
WB-Coffin 500 Esybox — variable-speed energy efficiency, matched flow at 3 bar (80 l/min) but higher max flow (120 l/min vs 80 l/min max) and 6 bar max pressure, WiFi and voice control, 3-year warranty. Best for larger domestic homes and light commercial premises with high simultaneous demand where potable water performance and smart control matter.
How much does it cost and how is it delivered?
Why a coffin-shaped tank?
How does the mains connection work?
What is the difference between this and the Powertank COFFIN 450 Variable?
Is 500 litres enough storage?
Should I choose Mini3 or Esybox?
How does the WiFi work?
What warranty is included?
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.
You may also need
The WaterBoost WB-Fixed 300 Slimline is a complete, pre-assembled fixed-speed water boosting system designed as a cost-effective solution to low water pressure or restricted flow…
The WaterBoost WB-EXT Slimline 300 Mini3 is a variable-speed water boosting system combining a 300-litre WRAS-approved slimline tank (600mm dia × 1200mm high) with the…
The WaterBoost WB-EXT Slimline 300 Esybox is a high-performance variable-speed boosting system for 3–4 bedroom homes combining a 300-litre WRAS-approved slimline tank (600mm dia ×…



