Below Ground Rainwater Harvesting Tanks

A below ground rainwater harvesting tank bought here will bring many benefits to a property, not least the ability to store large amounts of rainwater below the surface, saving space. Underground rainwater tanks can sit beneath your property, protecting the water from sunlight, preventing algae growth and keeping temperature down. We’re experienced in providing this solution to many residential properties and the ground rainwater harvesting tanks that we stock vary from 1500L right the way up to 7000L, catering for all. And, with free delivery to mainland UK and a team of expert installers on hand, we’re making sure that everybody can harvest rainwater underground with ease.

Below ground rainwater tanks

1500L F-line Flat Tank
£1,145.00 - £1,490.00

£1,374.00 - £1,788.00 inc VAT

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1500L F-line Flat Tank with built in leaf filter
£1,340.00 - £1,610.00

£1,608.00 - £1,932.00 inc VAT

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3000L F-line Flat Tank
£1,790.00 - £2,135.00

£2,148.00 - £2,562.00 inc VAT

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3000L F-line Flat Tank with built in leaf filter
£1,890.00 - £2,355.00

£2,268.00 - £2,826.00 inc VAT

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5000L F-line Flat Tank
£2,250.00 - £2,595.00

£2,700.00 - £3,114.00 inc VAT

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5000L F-line Flat Tank with built in leaf filter
£2,350.00 - £2,715.00

£2,820.00 - £3,258.00 inc VAT

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7500L F-line Flat Tank
£2,550.00 - £2,895.00

£3,060.00 - £3,474.00 inc VAT

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7500L F-line Flat Tank with built in leaf filter
£2,650.00 - £3,090.00

£3,180.00 - £3,708.00 inc VAT

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Underground garden rainwater harvesting systems

Below ground rainwater tanks

Supplied with or without a built-in filter, our flat underground tanks are a shallow design and can be installed with no concrete and very little fuss. Get in touch with us if you want our help making the whole process go smoothly. Whether your below ground tank has a filter pre-installed or not, it’s always advisable to filter the water, removing leaves and debris prior to storage, which is something our rainwater filter products can help you with if you need to buy a separate component.

At Owls Hall, we want you to have complete confidence in the product you’re buying. That’s why all of our below ground rainwater tanks come with a 25-year warranty. They’re relatively easy to install by yourself, but give us a ring on the number at the top of the page if you’d rather bring in some expert help to oversee the job.

For help with any of our systems, call our expert product team on:
01844 877030

We’re on hand to help you choose the ideal solution for your home. alternatively, check out our frequently asked questions.