Pillow Tanks from 1 to 500 m³ – Prices and Quotes

Which pillow tank suits your application?

A pillow tank is a closed reservoir made from a welded technical membrane that forms a sealed envelope. It fills progressively and takes its shape from the volume of liquid it holds. This gives you storage capacity without installing a rigid tank and, on most sites, without groundworks or a concrete base.

Capacity in litres is only part of the decision. Start by identifying the liquid, the autonomy you need, the space available and the equipment that will be connected to the tank. The main Flocea ranges answer different constraints:

• rainwater harvesting: garden, washdown, permitted domestic uses or buffer storage, with suitable filtration and overflow;
• potable water storage: membrane, fittings and commissioning procedure matched to drinking-water use;
• agriculture and irrigation: irrigation autonomy, livestock watering or farm reserve sized to seasonal demand;
• static fire-water storage: usable volume, access and suction arrangement agreed with the local Fire and Rescue Service;
• installation in a crawl space or void: low profile, access to the void and bearing area to be checked before ordering;
• bespoke manufacture: dimensions, position of connections and nature of the liquid defined from the actual site.

Capacities from 1 to 500 m³: think in usable volume

Most enquiries start with a 5 m³, 10 m³, 20 m³, 30 m³, 50 m³ or 100 m³ pillow tank. These are nominal capacities. The right volume is calculated from the consumption or flow rate you need to cover, how often the tank is refilled, and the margin of autonomy you want to keep.

For rainwater harvesting, roof area and local rainfall determine how much water you can realistically collect. For irrigation, work from daily demand and the number of days of autonomy required. For a fire-water project, the volume is set by the requirements applying to the site — it should never be chosen on a commercial estimate alone.

Potable and non-potable: a distinction to settle first

Potable and non-potable storage are not interchangeable. A tank intended for drinking water requires a membrane and fittings suitable for contact with water intended for human consumption, together with a defined cleaning and commissioning procedure. The reference framework is European: Directive (EU) 2020/2184 sets, in its Article 11, the minimum hygiene requirements for materials in contact with drinking water — the scheme that progressively replaces the former national approvals.

Non-potable duties — rainwater harvesting, irrigation, washdown, slurry, fire-water — are far less constrained, which is why the same nominal volume can carry a very different specification and price. Tell us the intended use at enquiry stage and we will confirm which membrane applies before you order.

Static fire-water storage: what to confirm

A fire-water pillow tank is more than a bag of water. The project covers the reserve itself, the connections, the suction arrangement, access and signage. In the United Kingdom, the applicable framework depends on the site: BS 9990 covers non-automatic fire-fighting systems in buildings, sprinkler reserves fall under the LPC Rules and BS EN 12845, and the local Fire and Rescue Service remains the deciding authority on siting, access and the required volume.

Before quoting, confirm the required volume, the distance between the reserve and the draw-off point, the coupling type, protection against impact or frost, and access conditions for appliances.

Installation, connections and accessories

The tank must sit on a level, stable, clean platform sized for its full footprint. Stones, sharp objects, roots and changes in level must be removed. A ground protection mat may be advisable depending on the terrain. Keep the tank accessible so that fittings can be inspected and maintenance carried out.

Filling, draining, overflow and draw-off are configured to suit the project. Valve diameter directly governs the flow rate available. The pump is then selected from the expected flow rate, the total head and the friction losses in the system.

Pillow tank prices and requesting a quotation

Price varies with capacity, membrane, stored liquid, dimensions, connections and options. Two tanks of identical volume can carry very different specifications if one is destined for drinking water and the other for farm slurry or a fire-water reserve. Standard models can be ordered outright once the requirement is clearly defined. A short technical review is preferable as soon as the application, the site or the connections fall outside a routine configuration.

To get a useful proposal, tell us the liquid, the volume, the location, the space available, the connection sizes and your required lead time. Bespoke products are shown as “price on application” where the price depends on the final configuration.

Frequently asked questions about pillow tanks