WaterBoost – Grand Range
WaterBoost – Grand 5000L Esybox Twin 2705G410
- Established 1975
- Trusted by thousands of customers
The WaterBoost Grand 5000 is the flagship of the Grand range — a 5,000L Enduramaxx slimline tank paired with a DAB Esybox Twin for full duty/standby pump redundancy and 140 L/min boosted output. 67% more stored volume than the Grand 3000 in a footprint just 290mm wider — the top-of-range option for large commercial properties, hospitality peak-day loading, or domestic properties needing a full week’s buffer against mains interruption.
A single-tank design — no linking pipework, fewer joints, faster install than a comparable 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.
Flagship capacity
Duty/standby pumps
Single-tank design
DAB Esybox Twin
10-year tank warranty
More about this product
The WaterBoost Grand 5000 is the flagship of the Grand range — a complete single-tank boosted water system built around a 5,000L Enduramaxx slimline tank and a DAB Esybox Twin pump frame. This is the top-of-range option for large commercial premises, hospitality with peak-day loading, or domestic properties where mains supply is unreliable enough to warrant a genuinely large buffer — 5,000L will typically cover a family for a full week on stored water alone.
Compared with the Grand 3000, this variant delivers 67% more stored volume in a footprint just 290mm wider and 465mm longer. The tank stays under 1.3 metres wide overall — slimline enough to sit along a garage wall or plant-room side where a conventional round 5,000L tank couldn’t. The Esybox Twin pump frame is unchanged across the whole range, so upgrading from a Grand 3000 spec is a tank-only cost difference.
Why the Grand 5000
Key features
What’s included
Applications
Installation notes
The tank must be sited on a flat, level base capable of supporting ~5,050 kg when full — a purpose-built concrete slab, engineered patio, or reinforced base pad. Domestic garage slabs are generally not rated for a point load of this magnitude — a structural surveyor should confirm before installation. The tank is delivered assembled and must reach its final position through an opening at least 1,300mm 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.
Delivery: the Grand 5000 tank ships on a pallet network vehicle and typically requires offloading facilities at the delivery point — a forklift, telehandler, or Hiab-equipped delivery. Check with Anglian Pumping Services when ordering to confirm delivery arrangements at your site.
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 5,000L Slimline — 1SG |
| Nominal capacity | 5,000 litres (±3%) |
| Dimensions (L × W × H) | 2850 × 1250 × 2076 mm |
| Outlet | 2″ BSP (standard) |
| Lid | 455mm vented |
| Material | Rotationally moulded polyethylene |
| Manufacture | UK manufactured |
| Weight (full) | ~5,050 kg |
| Access opening required | 1,300 mm minimum |
| 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) |
Flagship capacity
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 5000L Esybox Twin 2705G410. 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.