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How to correctly install a water tank

Importance of Correctly Installed Water Tanks

The selection of the correct tank is of the highest importance, before any installation goes ahead.

Most tanks constructed of Glass Reinforced Plastic (GRP) are not suitable for very warm/ hot water applications, therefore, a tank of steel or high temperature plastics would be more suitable.

Furthermore, if the tank installation needs to be outside, ensuring the correct selection of thickness of pre installation material is paramount.

If the right selection is not made, the tank will be unable to maintain a constant temperature, for example, heat up excessively during summer months and freeze during winter months.


When a water tank is installed, the base and foundations are the most important part of the build, if these are not applied correctly, this could affect the tank negatively. A concrete pad or a concrete peer base will be the ideal solution to give a water tank the best support. It is important to note that the load on these foundations should not exceed the manufacturer’s recommendations. If these foundations are not flat and level, particularly on sectional tanks, a very critical situation appears due to the panels being under unnecessary strain and twisted once filled, potentially fracturing the GRP panels. Within Hydraclean Ltd, a galvanised steel base is traditionally used in both standard and bespoke designs, application depending, due to material of this base, it further adds to the support of the water tank.

Tank Construction

During tank construction, the attention to detail demonstrated by our engineers ensures that all of our tank applications are completed to the highest of standards. Our engineers certify that all panels are dust free by wiping them down, all flanged edges of the water tank are fully covered with tank gaskets with all internal bolts being made of stainless steel and installed with their own bolt gaskets, achieved through the use of gasket cord.

In some cases, the water tank can require strengthening bars and roof supports. If this is the case, Hydraclean Ltd engineers will ensure that stainless steel strengthening bars are installed. Roof supports need to be of a solid construction to ensure no water is trapped in the structure of the support, otherwise this support can become compromised.

Bolts on the outside of the tank must be made of galvanised or stainless steel material. There is importance on the use of air tight foam to seal all the roof panels. Our engineers are Hydraclean Ltd ensure that this foam is Water Regulations Advisory Scheme (WRAS) approved. To complete the tank application correctly, all tank panels should be sufficiently torqued in line with the manufacturer’s recommendations. If these panels are over tightened, there is the possibility that they will crack.

In our experience, especially on larger sectional tanks, it is prudent once impacted/torqued to allow the tank to rest for ideally 24 hours. Another visit would then be carried out to re-torque to ensure water tight seals.

Piping Up

Finishing the correct installation of a water tank, attention to detail needs to be drawn to the pipe work. Depending upon the water tank application, it is imperative to ensure correct air aps are used when overflows are installed. It is also important to always ensure adequate cross flow within the tank between both inlet and outlet positions.

Our engineers at Hydraclean Ltd will always guarantee that should a sparge pipe be required, in order to gain adequate cross flow within the tank compartment, this is installed with a tight fitted seal, typically flanged or threaded as a permanent construction. Furthermore, it is important to ensure that there is adequate sparge pipe support. The size of the tank is also imperative to ensure the correct application of a tank – anything with a nominal capacity of at least 1000 litres must have warning pipes.

To complete the correct installation of a water tank, our engineers will guarantee that all mains overflows come with insect protection screens. All of the tanks that we install are able to breathe due to correctly sized and placed vents to stop any potential stagnation. Finally, any hot water vents should not be piped back into the tank, they should always discharge into its own safe location away from the tank.

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