WaterBoost – Coffin
WaterBoost WB-Coffin 200 Esybox Variable Speed
- Established 1975
- Trusted by thousands of customers
The WaterBoost WB-Coffin 200 Esybox is a variable-speed water boosting system for low water pressure or inadequate flow in domestic and light commercial applications. It pairs a 200-litre WRAS-approved coffin-style tank with the DAB Esybox, DAB’s flagship variable speed booster pump.
Suitable for heat pump systems. Gives an unvented hot water cylinder the pressure and flow it needs where the mains supply falls short.
The Esybox delivers up to 80 litres per minute at 3 bar and up to 120 l/min maximum, suiting larger homes and small commercial premises.
The low coffin-style tank measures 1185 mm (L) × 510 mm (W) × 490 mm (H) and suits garages, cupboards and plant rooms. It comes pre-fitted with a By-law 30 kit and ½″ ball valve, and all interconnecting pipework comes as standard.
More about this product
Product overview
The WaterBoost WB-Coffin 200 Esybox is a complete variable-speed boosting system: a 200-litre WRAS-approved coffin-style break tank feeding a DAB Esybox. Mains water fills the tank through the pre-fitted ½″ ball valve, and the Esybox draws from the tank to deliver up to 80 l/min at 3 bar, with a maximum flow of 120 l/min and a maximum head of 65 m.
The Esybox is a fully integrated all-in-one unit: a self-priming multi-stage pump, inverter, pressure and flow sensors, a 2-litre expansion vessel and an orientable LCD display in one compact housing. The variable speed inverter continuously matches motor speed to demand, holding constant pressure at every outlet while cutting energy use. Built-in WiFi connects to the DAB H2D app for remote monitoring, with Google Home and Amazon Alexa voice control.
DAB require the Esybox to draw from a break tank rather than connect directly to the mains, and the coffin tank provides that. The tank arrives pre-fitted with a By-law 30 kit and ½″ ball valve, and all interconnecting pipework comes with it. Both tank and pump are WRAS approved, and the Esybox carries a 3-year DAB warranty.
Key features
Typical applications
Technical specifications
| Brand / Model | WaterBoost WB-Coffin 200 Esybox |
| Configuration | 200 L coffin-style break tank with DAB Esybox variable speed pump |
| Pump | DAB Esybox (60212667) |
| Pump type | Self-priming multi-stage, variable speed inverter |
| Flow @ 3 bar | 80 l/min |
| Max flow | 120 l/min |
| Max head | 65 m |
| Max working pressure | 6.5 bar |
| Motor | 1.4 kW |
| Noise | 43 dB(A) |
| Expansion vessel | 2 litres, built in |
| Display | Orientable LCD |
| Connectivity | Built-in WiFi, DAB H2D app, Google Home and Amazon Alexa |
| Protections | Dry-run, overtemperature, anti-frost, anti-cycling, voltage anomaly |
| Pump dimensions | 263 × 362 × 564 mm (564 mm high) |
| Pump weight | 27 kg |
| Tank | 200 litre coffin-style, WRAS approved |
| Tank dimensions | 1185 (L) × 510 (W) × 490 (H) mm |
| Tank fittings | By-law 30 kit and ½″ ball valve, pre-fitted |
| Pipework | All interconnecting pipework included |
| Approvals | Tank and pump WRAS approved |
| Pump warranty | 3 years (DAB) |
Installation notes
Frequently asked questions
How much flow does it give?
Up to 80 l/min at 3 bar, with a maximum of 120 l/min.
Can it connect directly to the mains?
No. DAB require the Esybox to draw from a break tank, so the mains feeds the 200 litre coffin tank and the Esybox boosts from the tank.
Does it work with a heat pump?
Yes. It gives an unvented hot water cylinder the pressure and flow it needs where the mains supply falls short.
Can I control it from my phone?
Yes. Built-in WiFi connects the Esybox to the DAB H2D app for remote monitoring, and it supports Google Home and Amazon Alexa voice control.
What comes with it?
The 200 litre coffin tank, pre-fitted with a By-law 30 kit and ½″ ball valve, the DAB Esybox, and all interconnecting pipework.
What warranty does the pump have?
The DAB Esybox carries a 3-year DAB warranty.
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 200 Esybox Variable Speed. 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.