WaterBoost INground
WaterBoost INground WB-IG1500 1500 litre underground water boosting system
- Established 1975
- Trusted by thousands of customers
The WaterBoost Inground 1500 hides your whole booster system in the garden. A 1,500 litre buried potable tank and a fully submersible DAB Esybox Diver deliver strong, steady pressure with nothing taking up space indoors.
Nearly double the reserve of the 800 in a horizontal tank — ideal for 4–5 bedroom homes, conversions and slow or unreliable mains supplies.
Silent — pump underwater
Nothing in the house
App control
WRAS approved pump
Kiosk with CU & sockets
More about this product
The WaterBoost Inground 1500 gives larger households a deeper reserve. A 1,500 litre buried potable tank stores the water and a fully submersible DAB Esybox Diver on the tank base boosts it to every outlet in the house — with nothing indoors but the taps.
The horizontal tank keeps the dig shallower for its capacity, and nearly doubles the stored water of the 800 — ideal for 4–5 bedroom homes, barn conversions and properties with a slow-filling or unreliable mains supply.
reserve
Silent — pump underwater
Nothing in the house
App control
WRAS approved pump
Horizontal tank
4–5 bed homes
Why choose the Inground 1500?
Key specifications
| Part number | WB-IG1500 |
| Storage | 1,500 litres (330 gallons) |
| Tank | Horizontal underground potable tank, one-piece HDPE, UK made, 10-year guarantee |
| Tank dimensions | 1400 L x 1580 W x 1690 H mm |
| Pump | DAB Esybox Diver 55/120 — 7″ submersible, variable speed, IP68, WRAS approved |
| Pressure | Pre-set 3 bar, adjustable 1–5.5 bar |
| Max flow | Up to 120 l/min (7.2 m³/h) |
| Electrical | 230 V single phase, 5.5 A; 15 m cable with plug |
| Outlet | 1¼” BSP female |
| Best for | 4–5 bedroom homes, conversions and slow or unreliable mains supplies |
What’s included
- 1,500 L underground potable tank with access lid
- DAB Esybox Diver 55/120 with DConnect Box 2
- Tank level sensor
- Float valve inlet
- White kiosk with consumer unit and 2 sockets (pump + DConnect Box 2)
More stored water, the same silent, hidden boost — the WaterBoost Inground 1500 is built for busy family homes. Electrical connection by a qualified electrician.
Not sure which WaterBoost you need?
Five questions and the sizer picks the tank and pump for your house.
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 INground WB-IG1500 1500 litre underground water boosting system. 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.