Water Storage Tanks from the Online Tank Store

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Water Tanks
Water Tanks
Above Ground Water Tanks
Above Ground Water Tanks
Baffled Water Tanks
Baffled Water Tanks
Camper Van & Motorhome
Camper Van & Motorhome
Cat 5 AB Air Gap Tanks
Cat 5 AB Air Gap Tanks
Conical Tanks
Conical Tanks
Cold Water Loft Tanks
Cold Water Loft Tanks
Fish Holding Tanks
Fish Holding Tanks
Liquid Fertiliser Tanks
Liquid Fertiliser Tanks
Molasses Tank
Molasses Tank
Underslung Water Tanks
Underslung Water Tanks
Non-Potable Water Tanks
Non-Potable Water Tanks
Open Top Water Tanks
Open Top Water Tanks
Rainwater Harvesting
Rainwater Harvesting
Round Water Tanks
Round Water Tanks
Standard Water Tanks
Standard Water Tanks
Slimline Water Tanks
Slimline Water Tanks
Transportable Water Tanks
Transportable Water Tanks
Underground Water Tanks
Underground Water Tanks
Water Containers
Water Containers
Water Butts
Water Butts
Water Bowsers
Water Bowsers
Water Trolleys
Water Trolleys
Wheel Arch Water Tanks
Wheel Arch Water Tanks
Window Cleaning Tanks
Window Cleaning Tanks
Fittings & Accessories
Fittings & Accessories

Water Tanks

The Online Tank Store offer a full range of UK-Manufactured Water Storage Tanks made from UV-Stabilised, High Quality Plastic (Medium Density Polyethylene). Designed for durability, the tanks are hard wearing, weatherproof and long lasting. We offer Food-Grade Tanks suitable for Potable (Drinking) Water, as well as chemical storage, waste water and general water storage. Read More

Our Water Tanks have a wide variety of uses from domestic to commercial installations.

The Standard Water Tanks are a great solution when using around the home or out camping with the family. The Baffled Water Tanks are commonly used as car valeting tanks, Window Cleaning Tanks and general water storage. The upright Round Tanks are great for rainwater harvesting home or commercial use. Most of our MDPE tanks are suitable to store a wide range of chemicals in.

What Water Storage Tank do I need?

Looking to fit your Water Storage Tank into a particular space? Use our handy filters above. Just input the dimensions of the space you have available and the calculator will bring up all the tanks that will fit.

Still unsure? View our handy 7-step guide to choosing a water tank here.

Can’t see what you are looking for?

Need an additional outlet? Looking for a different colour? Here at the Online Tank Store, we can also offer custom tanks for your bespoke needs. Just send us a message through our contact form and we will be happy to discuss your requirements.

More questions about our Water Tank range?

For any other questions about the Water Containers or to discuss buying in bulk, use our contact form here or visit our FAQs page.

View by capacity

0-250 Litre Water Tanks
0-250 Litre Water Tanks

103 Products

251-500 Litres
251-500 Litres

50 Products

501-750 Litres
501-750 Litres

18 Products

751-1000 Litres
751-1000 Litres

39 Products

1000+ Litres
1000+ Litres

238 Products

Popular products

Category Bestsellers

0-250 Litre Water Tanks

5 Litre Water Tank

Water Containers

50 Litre Water Tank

Baffled Water Tanks

250 Litre Upright Baffled Water Tank

Baffled Water Tanks

210 Litre Flat Baffled Water Tank

1000 Litre Water Tank

Transportable Water Tanks

1000 Litre Upright Baffled Water Tank

751-1000 Litres

900 Litre Flat Water Tank

Baffled Water Tanks

1000 Litre Upright Baffled Tank – Enduramaxx

Above Ground Water Tanks

1000 Litre Horizontal Baffled Tank – Enduramaxx

Potable Water Tanks

1000+ Litres

1250 Litre Potable Water Tank – Enduramaxx

Baffled Water Tanks

800 Litre Upright Baffled Tank – Enduramaxx

Above Ground Water Tanks

12,500 Litre Potable Water Tank – Enduramaxx

Above Ground Water Tanks

5000 Litre Potable Water Tank – Enduramaxx

Underslung Water Tanks

Baffled Water Tanks

210 Litre Flat Baffled Water Tank

Water Containers

60 Litre Flat Water Tank

Water Tank Categories

90 Litre Underslung Water Tank – Crafter / MAN 2017 Onwards

Water Containers

51 Litre Flat Water Tank

Water Tank FAQs

‘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.

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.

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.
An example of 3 x 1 Inch Fusion Sockets fitted to a 155 Litre Flat Tank.

Yes, planned viewing is possible at a number of locations. Please call and allow us time to arrange this for you.

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.

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.

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).
8 Inch Plain Lid
8 Inch Spring Vented Lid
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.

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

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.

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.

Baffled Water Tanks
Baffled Water Tanks
Water Containers
Water Containers
Underslung Water Tanks
Underslung Water Tanks
Standard Water Tanks
Standard Water Tanks
Above Ground Water Tanks
Above Ground Water Tanks
Underground Water Tanks
Underground Water Tanks
Water Butts
Water Butts
Rainwater Harvesting
Rainwater Harvesting
Slimline Water Tanks
Slimline Water Tanks
Cold Water Loft Tanks
Cold Water Loft Tanks
Camper Van & Motorhome
Camper Van & Motorhome
Round Water Tanks
Round Water Tanks
Conical Tanks
Conical Tanks
Window Cleaning Tanks
Window Cleaning Tanks
Non-Potable Water Tanks
Non-Potable Water Tanks
Water Trolleys
Water Trolleys
Open Top Water Tanks
Open Top Water Tanks
Water Bowsers
Water Bowsers
Fish Holding Tanks
Fish Holding Tanks
Cat 5 AB Air Gap Tanks
Cat 5 AB Air Gap Tanks
Liquid Fertiliser Tanks
Liquid Fertiliser Tanks
Wheel Arch Water Tanks
Wheel Arch Water Tanks
Fittings & Accessories
Fittings & Accessories
Transportable Water Tanks
Transportable Water Tanks

Water Tanks

The Online Tank Store offer a full range of UK-Manufactured Water Storage Tanks made from UV-Stabilised, High Quality Plastic (Medium Density Polyethylene). Designed for durability, the tanks are hard wearing, weatherproof and long lasting. We offer Food-Grade Tanks suitable for Potable (Drinking) Water, as well as chemical storage, waste water and general water storage. Read More

Our Water Tanks have a wide variety of uses from domestic to commercial installations.

The Standard Water Tanks are a great solution when using around the home or out camping with the family. The Baffled Water Tanks are commonly used as car valeting tanks, Window Cleaning Tanks and general water storage. The upright Round Tanks are great for rainwater harvesting home or commercial use. Most of our MDPE tanks are suitable to store a wide range of chemicals in.

What water storage tank do I need?

Looking to fit your Water Storage Tank into a particular space? Use our handy filters below. Just input the dimensions of the space you have available and the calculator will bring up all the tanks that will fit.

Still unsure? View our handy 7-step guide to choosing a water tank here.

Can’t see what you are looking for?

Need an additional outlet? Looking for a different colour? Here at the Online Tank Store, we can also offer custom tanks for your bespoke needs. Just send us a message through our contact form and we will be happy to discuss your requirements.

More questions about our water tank range?

For any other questions or to discuss buying in bulk, use our contact form here or visit our FAQs page.

View by capacity

0 - 250 Litre Water Tanks
251-500 Litre Water Tanks
501-750 Litre Water Tanks
751 - 1000 Litre Water Tanks
1000 Litres + Water Tanks

Filter by measurements

Looking to fit a tank within a set space? Use our handy filter below.

Recently added

3/4″ BSP (M) x 1/2″ (F) Reducing Bush (Brass)

1/2″ BSP Symmetrical Nipple

37/31 Litre Wheel Arch Tank Fitting Kit

Water Tank FAQs

‘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.

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.

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.
An example of 3 x 1 Inch Fusion Sockets fitted to a 155 Litre Flat Tank.

Yes, planned viewing is possible at a number of locations. Please call and allow us time to arrange this for you.

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.

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.

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).
8 Inch Plain Lid
8 Inch Spring Vented Lid
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.

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

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.

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.