Water Tanks
Here at the Online Tank Store, we offer an extensive range of high-quality liquid water storage vessels. Manufactured by the UK’s top leading tank experts including Wydale Plastics, Enduramaxx and Tuffa Tanks. Read More The plastic tank you need will depend on its application. We can supply a product for many purposes. Medium density polyethene (MDPE) is the material used for the manufacture of most tanks. This material has many useful properties. Rainwater Harvesting Tanks to collect, filter and store rainwater for both domestic and commercial applications. A rainwater tank is a description for many systems. This term can describe a rainwater harvesting system with a pumped supply. A simple garden water tank (water butt) for storing water offers a simpler form of rainwater harvesting. The use of rain water for tasks such as watering plants or washing the car reduces reliance on the mains supply. Recycling rain water is a cost effective solution to water consumption. Using rainwater reduces water bills and minimizes the risk of using excess water. Our Water Containers range consists of smaller water tanks used for a huge range of applications. From supporting events, to camping trips or catering. Sizes range from 4 Litres upwards. Potable water storage for the storage of water for human consumption. We can supply tanks manufactured from a potable WRAS approved material. We can also supply systems with WRAS approval. Potable water tanks are available throughout most of the range. Campervan & Motorhome water tanks for water storage on the move. We are specialists in Campervan and Motorhome water tanks and can offer expert advice on the correct tank. Our water tanks for campervans range offers underslung tanks designed for specific vehicles such as Volkswagen Crafter, Transporter & Ducato. We can also supply tanks to fit in a measured space. With the dimensions of the space you have available, we can advise what will make best use of this space. Alongside the tanks, we also offer a range of purpose based plumbing kits, designed to make the water tank plumbing a breeze. Baffled Water Tanks designed for the safer transportation of liquid. A baffled tank has internal walls to help control the flow of liquid when the tank is in transport. This function is particularly useful when moving larger volumes of water.A window cleaner or car valet may use a baffled tank. A transportable water tanks with baffles can improve vehicle handling and reduce wear and tear on a car or van. Underground Water Storage to offer a neat solution to bulk water storage. Key sectors include Farming & Agriculture, Fire Suppression & Gardening & Landscaping. The underground storage tank range helps save crucial space above ground. Other sectors include Waste Water Treatment, Chemical Manufacturing. Agricultural, Commercial, Domestic And Industrial Water Storage. If you are looking for a large water tank, rain water tank or a range of smaller water tanks plastic tanks, let us know. Bespoke configurations are available. This includes items such as firefighting attachments, bolted outlets and level gauges. We can deliver to all corners of the UK with options for fast delivery or assisted offload. Collection is also available for those that need a quick solution. Online Tank Store also offer international delivery on our product range. Collection the same day is possible on a wide range of popular tanks, held in stock at our unit in Beaminster, Dorset. Our team have extensive experience in the rotational moulding industry, alongside expert knowledge of our products. They will be happy to support any enquiries.Popular categories
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0-250 Litre Water Tanks
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0-250 Litre Water Tanks
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0-250 Litre Water Tanks
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0-250 Litre Water Tanks
0-250 Litre Water Tanks
0-250 Litre Water Tanks
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Water Tank FAQs
What Does 'Potable' mean?
‘Potable’ is a term used to describe a tank suitable for storing water for human consumption. To be classified as potable, the plastic it is manufactured from must conform to the WRAS (Water Regulations Advisory Scheme). For more information on this, please visit the WRAS Approvals website here where they have an information titled ‘What is a WRAS Approval?’.
All our potable tanks adhere to these regulations. It will specify if a tank is potable in the Product Specification section on each product page.
What Water Tank do I need?
Water Storage Tanks are used across many different industries, which can make purchasing the correct one a little daunting.The following guide may be useful to you – ‘What Water Storage Tank Do I Need?.
Still Unsure? We are always willing to help – just give us a call or contact us here.
What is a Fusion Socket?
Each tank comes with a outlet as standard. The plastic behind the outlet can be removed (‘drilled’) to allow the liquid to run out of the tank and through a tap if you have one fitted. It can also be left ‘undrilled’ which means it remains closed and the liquid cannot come out through this outlet. You may wish the outlet to be left undrilled if you plan to use the tank purely to store water, as an example.
It is possible to choose ‘drilled’ but purchase a ‘plug’ for the correct size outlet which will seal the outlet when required but allow for flexibility in the use of the outlet. Another option is to choose to have the tank ‘undrilled’ and remove the plastic yourself at a later date.

Can I View Tanks Before Purchasing?
Yes, planned viewing is possible at a number of locations. Please call and allow us time to arrange this for you.
I plan to transport the tank in a van. What tank may be best?
From experience, our customers favor the Baffled Water Tanks for this application.
A Baffled Water Tank has pre-moulded internal walls called ‘baffles’ which helps to control the movement of the water in the tank during transportation of liquid. This also helps to improve the vehicle maneuverability.
The size of tank required is completely dependent on the size of your vehicle and the set-up you require. The most popular Baffled Water Tanks are as follows: 210 Litre upright, 250 Litre upright, 350 Litre upright and the 400 Litre upright water tank. We do have customers who prefer the larger tanks so this is also an option.
The Baffled Water Tanks are also suitable for use with water-fed poles.
To view our full range of Baffled Water Tanks, click here.
Can I add extra inlets / outlets to the water tanks?
Yes. This is possible by using a ‘fusion’ and are available in a number of sizes to suit your application or project. View the range here or read our Fusion Socket Guide here for more information. Just add the required fusion onto your order and once complete, we will be in touch to arrange placement of the fusion/s.
What lid do I need?
Each Water Storage Tank comes with either a ‘Vented’ or a ‘Plain’ lid as standard.
A vented lid allows air to circulate within the tank, helping to control the pressure within it. This is important if you plan to attach a pump to the tank as without this, the pressure may cause the tank may deform. Often, this type of damage is not repairable.
A plain lid is purely for containing the water and stops air getting into the tank.
See below for an example of either type (Note – the lid may look slightly different depending on what tank you are looking at. Please refer to the individual product for details).


In most instances, it is possible to swap a lid for an alternative but please contact us before ordering unless it is offered as an option on the product page.
Are there other colours available?
Yes, we are able to manufacture the majority of the Water Tank range in a wide variety of colours. You can view our Colour Chart page here
I wish to use my tank for saltwater. Is this suitable?
This is no problem, the only consideration you may wish to make when using saltwater is whether you would prefer to use a plastic outlet (know as a fusion) rather than the brass or nickel outlet that come as standard with the range. If this is the case, all you need to do is request that you tank comes 'undrilled' which will ensure a plastic 'wall' separates the metal fusion and the tank contents. The plastic fusion can be added almost anywhere on the tank. Just choose the fusion you require and add to your basket along with the tank. Once your order is placed, we will then in touch to discuss where you wish your plastic outlet to be placed.
What is the Byelaw 30 Kit?
The Byelaw 30 Kit is specifically used when connecting a tank to mains water supply. With an insect proof screened vent, as well as preventing backflow of the stored water into the main s(potable) supply, it helps to prevents contamination A Byelaw 30 Kit is required in order to conform to the Byelaw 30 Regulation as it helps to maintain the quality of the water in the tank.