GRPTanks

A one-piece tank is moulded as a single unit and is generally the most cost-effective option where access allows delivery of a complete tank. Two-piece tanks are joined on site with a sealed flange, useful where access is tighter but a crane or lifting gear can still get the halves in. Sectional tanks are built up from individual panels bolted together inside the building, making them the only practical option for large capacities or restricted access such as plant rooms and roof spaces.

Yes, provided the tank is manufactured from WRAS-approved materials and fitted with the correct WRAS-approved fittings such as float valves, overflows and inlets. Our potable GRP tanks are specifically designed and tested for contact with wholesome water, so water quality isn't compromised. Always check the tank's WRAS approval status before connecting it to a drinking water supply.

Sizing depends on the application — domestic cold water storage is typically based on daily household demand plus a reserve, while fire suppression or agricultural use will have their own calculation methods. As a guide, a typical UK household uses around 150 litres per person per day, but you should also factor in peak demand and any backup requirement if mains supply is interrupted. If you're unsure, get in touch with our team with your usage figures and available installation space and we can help you select an appropriate capacity.

GRP tanks need a firm, flat, level base capable of bearing the full weight of the tank when filled with water, as an uneven surface can cause stress cracking over time. For ground-level installation this is typically a concrete slab or compacted hardcore base, while elevated or roof-mounted tanks require a proper steel support frame rated for the filled weight. We supply tank foundations and support frames designed to match our tank ranges, so it's worth specifying these together.

It's good practice to have potable water tanks inspected and disinfected annually to prevent bacterial growth, sediment build-up or biofilm forming, particularly on systems supplying drinking water. This is a straightforward job for a qualified water hygiene contractor and helps maintain compliance with water quality regulations. Regular inspection also lets you catch any fitting or seal issues early, well before they become a bigger problem.

Most installations need, at minimum, a WRAS-approved float valve to control filling, an overflow with insect-proof screening, and an outlet fitting sized to your pipework. Depending on the application you may also want level monitoring or control equipment, access ladders, drip trays to catch condensation or minor leaks, and a support frame or foundation base. It's worth speaking to us before ordering so the tank and accessories are specified as a matched set.