Rainwater Harvesting Tanks

With water becoming an increasingly costly and regulated commodity, rainwater harvesting is an attractive option saving both money and precious water resources. And what better way to save resources than by using the rain that falls on a property’s roof and storing it in a Tuffa Rainwater Tank?


Rainwater harvesting tanks and kits enable you to collect free rainwater and can therefore offer you huge economic and environmental benefits. Not only that, but because rainwater is completely natural it’s often a better alternative to tap water, which is treated. Rainwater contains minerals and microorganisms which help promote plant growth, it also provides naturally softer water which reduces the need for detergents when washing. The water cycle process naturally filters water and with additional filtration to remove remaining contaminants, it can be safely used for drinking and cooking.


While it’s hard to believe that water scarcity could be a problem in the UK, earlier this year it was listed as one of the largest global risks over the next decade according to the World Economic Forum. Rainwater harvesting tanks make use of a free resource by storing and filtering water that falls on roofs. Our rainwater tanks offer high-quality bulk storage in domestic, commercial and agricultural sizes. Capacities range from 1,350 to 20,000 litres.



As well as manufacturing high quality water tanks, we also supply rainwater collection kits for domestic, agricultural and commercial water tanks. Our filtration and pumping kits are suitable for various roof and tank sizes and can be purchased together or separately.


Our equipment includes:


Rainwater filter diverter


Filters water from the guttering to remove dirt and debris before the water is diverted to the storage tank.


Calmed inlet


The calmed inlet oxygenates the existing water and prevents it from stagnating by releasing the water at the bottom of the tank.


Overflow siphon


When the tank reaches maximum capacity the overflow siphon diverts the excess water to drainage. It also removes pollen from the water surface to keep it clean.


Submersible pump


A manual or automatic submersible pump directs the water from the bottom of the tank to the desired output such as a hose or washing machine.




We’re big advocates of rainwater harvesting. Water is an ever more precious (and sometimes expensive) resource, so collecting it when the weather takes a turn for the worse can leave you with a store of water to do with as you wish. The most common uses of collected rainwater that we come across are:


  •         Cooking and consumption: As it falls, rainwater is relatively clean, although it can become contaminated once it lands on the Earth’s surface. There are options for filtering out any contaminates, and once this is done the water is safe to use for both cooking and drinking.


  •         Domestic appliances: It will come as no surprise that the majority of our water usage comes from flushing toilets, showering, using a washing machine or dishwasher, and so on. Using harvested rainwater for all of this instead can significantly reduce water bills.


  •         Watering gardens and plants: Even in the British Summer, parts of the country can suffer a drought so for keen gardeners it makes sense to keep a store of water on hand to keep their plants and gardens well watered.



Rainwater collection works by capturing water that falls on your roof. This water is then directed to a central point via normal guttering and downpipes to a storage tank, where it can be filtered on entry. You can read our blog How to Harvest Rainwater in Three Steps for more information.



We recommend buying the maximum capacity tank you can to reduce the chance of running out of water and to minimise the frequency of tank refills (or waste collection).


As a guide, we recommend the following capacities:


Tank SizeRecommended Usage
1350 litre rainwater tankSmall-medium garden with limited space
1350 – 1400 litre rainwater tankSmall-medium garden
2,500 litre rainwater tankLarge garden
3,500 litre rainwater tankGarden and basic utilities
6,000 litre rainwater tankSmall house including utilities and potable water

Small scale commercial/industrial use

10,000 litre rainwater tankMedium-large house including utilities and potable water

Medium scale commercial/industrial use

15,000 litre rainwater tankLarge house or small-scale agricultural, commercial and industrial use

Large scale commercial/industrial use

20,000 litre rainwater tankLarge scale agricultural, commercial and industrial use

Very large scale commercial/industrial use




To calculate the volume of rainwater you can collect use the following formulae: 1” of rain x 1 square meter = 25 litres


The average annual rainfall in the UK is 44 inches. Check out the table below to see what your roof could yield with the average yearly rain:


Roof Area (Sq. Meters)Annual Water Yield (Litres)
Greenhouse (5 Sq. Meters)5,500
Shed (7 Sq. Meters)7,700
Garage (15 Sq. Meters)16,500
Mid terrace (55 Sq. Meters)60,500
3 Bed Semi-Detached (70 Sq. Meters)77,000
3 Bed Bungalow (100 Sq. Meters)110,000
4 Bed Detached (100 Sq. Meters)110,000



All of our tanks come with a 10 year guarantee when registered, a 1 guarantee on ancillary goods, and a 3 month warranty on hoses.



Tuffa Tanks are generally built to order. We can arrange delivery direct to site in the UK or abroad. Alternatively, tanks can be collected from our Uttoxeter factory.


Typical build times are as follows:


Plastic tanksStock tanks available with next day delivery – call us for current stock levels
 Small standard tanks (up to 2500 litres): 7-10 days
 Large standard tanks (over 2500 litres): 2-3 weeks



Our plastic rainwater tanks are made from recyclable polyethylene and are manufactured to ensure a maximum wall thickness at the base – where it’s needed most. They are also corrosion resistant, weatherproof and UV stabilised. They are also very durable and require little or no maintenance.


For any enquiries contact our sales support team on 01889 567700. For online enquiries use the form on our Contact page or the product page you wish to enquire about.