Water Tanks

The Online Tank Store offer a full range of Water Tanks and plastic water storage tanks manufactured from high-quality, UV-stabilised polyethylene. Working with leading UK manufacturers, our water tanks are designed to be hard-wearing, weatherproof and long-lasting for domestic, agricultural and commercial use. Read More

Find The Right Water Tank In Minutes

Choosing the correct water tank doesn’t have to be difficult. We’ve organised our range into easy-to-browse categories to help you quickly find the right solution:

Many of our water tanks can be modified to suit your project, including additional outlets, thicker walls for specialist applications, or custom fittings. If you require a bespoke water tank, please contact us and we’ll be happy to discuss your requirements.

We also list our products by manufacturer here.

How To Choose The Best Water Tank

Not sure what size or type of water tank you need? Our handy 7-step guide will help you choose the right tank. When selecting a water tank, consider:

  1. What will the tank be used for? (Drinking water, rainwater harvesting, irrigation, etc.)
  2. The capacity required based on usage or roof area
  3. Available space and installation restrictions

If you need to fit a water tank into a specific area, simply enter your available dimensions into our shop filters to display suitable options.

Still unsure? Call our team for expert advice – we’re here to help.

Can’t See What You Are Looking For?

Need an additional outlet, a different colour, or specific pipework? We supply custom water tanks tailored to your project requirements. Contact us via our form or call to discuss your bespoke tank solution.

Water Storage Tanks from the Online Tank Store

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Water Tanks For Every Application

Whether you need a water tank for rainwater harvesting, emergency storage or commercial use, the Online Tank Store has got it covered. We offer tanks with sizes to suit every requirement, including domestic or commercial, above-ground or underground.

View by capacity

Popular products

1000 Litre Water Tanks

Potable Water Tanks

Underslung Water Tanks

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Water Tanks – Frequently Asked Questions

Many of our water tanks are manufactured from food-grade, UV-stabilised polyethylene and are suitable for potable (drinking) water storage. Where required, we also supply WRAS-approved water tanks for installations that need certified potable compliance. Product pages clearly indicate suitability.

Yes. We supply both above-ground water tanks and underground water tanks. Above-ground tanks are easier to install and maintain, while underground tanks offer a discreet, space-saving solution. The correct option depends on available space, access and installation requirements.

Do you supply large capacity water tanks?

Most of our plastic water tanks can be adapted with additional inlets, outlets, level gauges or thicker walls for specialist applications. If you require a bespoke configuration, contact our team and we’ll be happy to advise on suitable options.

We deliver water tanks across the UK, including offshore locations. Delivery times vary depending on size and specification, but many standard tanks are available with fast UK delivery. Collection may also be available for selected products.