WaterBoost – Grand Range
WaterBoost – Grand 3000L Esybox Twin 2703G410
- Established 1975
- Trusted by thousands of customers
The WaterBoost Grand 3000 is the middle of the Grand range — a 3,000L Enduramaxx slimline tank paired with a DAB Esybox Twin for full duty/standby pump redundancy and 140 L/min boosted output. Adds 50% more stored volume than the Grand 2000 while staying under 1 metre wide — the sweet spot for larger domestic properties or light commercial premises with space along a wall or side passage.
A single-tank design — no linking pipework, fewer joints, faster install than a twin-linked setup. The Esybox Twin pump frame runs two DAB e.sybox units in wireless duty/standby, alternating priority every 23 hours, with full pump redundancy if one unit fails.
Sub-1m width
Duty/standby pumps
Single-tank design
DAB Esybox Twin
10-year tank warranty
More about this product
The WaterBoost Grand 3000 is the mid-range option in the Grand family — a complete single-tank boosted water system built around a 3,000L Enduramaxx slimline tank and a DAB Esybox Twin pump frame. It bridges the gap between the compact Grand 2000 and the flagship Grand 5000: 50% more stored volume than the 2000, at only 110mm more width, and still under a metre wide overall.
This is the model that suits larger domestic properties — five or more bathrooms, holiday lets with peak demand at check-in and check-out, or rural properties running off a slow-fill borehole where extended peak draw depletes a 2,000L buffer. It also suits light commercial premises — small hotels, gyms, salons, and workshops where continuous daily draw benefits from the extra buffer. All three Grand models take the same Esybox Twin pump frame, so upgrading from a Grand 2000 spec to a Grand 3000 is a tank-only cost difference.
Why the Grand 3000
Key features
What’s included
Applications
Installation notes
The tank must be sited on a flat, level base capable of supporting ~3,050 kg when full — a concrete slab, engineered patio, or purpose-built base pad. Domestic garage slabs may or may not be rated for a point load of this magnitude; check with a structural surveyor if in doubt. The tank is delivered assembled and must reach its final position through an opening at least 1,000mm wide; check access before ordering. The Esybox Twin pump frame mounts alongside the tank on a wall or floor stand, with the suction line connected to the tank’s 2″ outlet.
Water Regulations: installations that connect to the mains water supply are notifiable to the water undertaker under Regulation 5 of the Water Supply (Water Fittings) Regulations 1999. The system ships with byelaw fittings for compliance; installation should be by a suitably qualified plumber.
Technical specifications
| Tank | |
| Model | Enduramaxx 3,000L Slimline — 1SG |
| Nominal capacity | 3,000 litres (±3%) |
| Dimensions (L × W × H) | 2385 × 960 × 1931 mm |
| Outlet | 2″ BSP (standard) |
| Lid | 455mm vented |
| Material | Rotationally moulded polyethylene |
| Manufacture | UK manufactured |
| Tank guarantee | 10 years |
| Pump | |
| Model | DAB E.SYBOX TWIN (two units) |
| Configuration | Duty/standby with wireless communication |
| Max flow (H2D) | 140 L/min (both pumps combined) |
| Max head | 65 m (6.5 bar) |
| Voltage | 230V 1φ 50Hz |
| Motor rating (per unit) | 1.55 kW / 2 HP |
| Control | Integrated variable-speed inverter with constant-pressure control |
| Anti-stagnation | Priority rotates every 23 hours |
| Manufacture | DAB Pumps, Italy |
| Pump warranty | 3 years (DAB manufacturer) |
Sub-1m width
Duty/standby pumps
140 L/min boosted
Single-tank design
UK-made tank
10-year tank warranty
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data sheet PDFDownload
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esybox brochure 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 – Grand 3000L Esybox Twin 2703G410. 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.