GRPInsulated

GRP (glass reinforced plastic) insulated tanks have a foam or dual-skin insulation layer built into the tank wall, rather than relying on external lagging. This keeps stored water at a more stable temperature, reducing the risk of freezing in winter and limiting bacterial growth from warm water in summer. It also cuts the energy needed to reheat or repump water, which matters if the tank feeds a pressurised system.

Units in this collection are supplied as pre-configured packages with an integrated pumping system already fitted, so there's no need to source and plumb in a separate pump. This includes the associated pipework and controls needed for steady pressure delivery. You'll still need to arrange the electrical supply and any external pressure vessel or controller specified by the pump manufacturer.

They're commonly specified for properties off the mains pressure network, holiday lets, rural homes on borehole or well supply, and commercial sites needing a reliable boosted water supply. The insulation makes them well suited to above-ground or partially exposed installations where temperature fluctuation would otherwise be a problem. They're also popular where space is tight, as the tank and pump share one compact footprint rather than needing separate plant rooms.

Most GRP insulated tank and pump units are designed for above-ground installation, which is one of their main advantages over standard buried tanks — no excavation, groundworks or backfill required. They still need a firm, level, load-bearing base and, if sited outdoors, some protection from direct sun and extreme wind exposure. Always check the specific unit's siting requirements, as insulation ratings vary between models.

Sizing depends on daily demand, number of occupants or outlets, and whether the tank is a sole supply or backup. As a rough guide, domestic properties often use tanks in the 1,000–5,000 litre range, while commercial or multi-occupancy sites need higher capacity and a pump matched to peak simultaneous demand. It's worth calculating your actual daily consumption before ordering, as an undersized pump will struggle to maintain pressure at busy times.

Some models in this range are WRAS approved for potable water storage, but not all — it depends on the specific tank and liner material used. If you need the supply for drinking, cooking or washing, check the WRAS approval status of the exact product before purchase. For non-potable uses such as irrigation or general utility supply, this isn't a requirement, but it's still good practice to confirm what the tank is rated for.