TopTank 400 Litre Rectangular Loft Water Tank, Polyethylene

TopTank 400L Rectangular Tank

The TopTank 400 Litre Tank provides a reliable, low-profile solution for indoor water storage in residential and commercial roof spaces. This unit uses high-quality food-grade polyethylene to ensure water safety and long-term durability. It is specifically engineered for areas where vertical height is restricted, making it a standard choice for attic and loft installations.

Built for the Job

Plumbers and site supervisors prioritize this rectangular profile for installations with limited clearance. The design allows the vessel to fit through standard loft hatches more easily than equivalent cylindrical models. Because the weight is distributed over a larger rectangular footprint, it exerts less concentrated pressure on ceiling joists, provided a proper spreader board is used. This storage vessel handles domestic water header requirements or serves as a primary reservoir in smaller residential units.

• Installation in restricted attic spaces for gravity-fed systems.

• Secondary water storage for facility management backup.

• Buffer tank for low-pressure municipal supply connections.

Product Highlights

Rotationally Molded Body

The manufacturing process creates a seamless, single-piece structure that eliminates weak points or potential leak paths.

Material Performance

• UV-stabilized LLDPE prevents degradation if exposed to indirect sunlight.
• Food-grade lining ensures the stored liquid remains potable and free from plastic odors.

Technical Specifications

What’s Included

• 1 x 400 Litre Rectangular Water Tank

• 1 x Heavy-duty threaded lid

On-Site & Workshop Notes

• Always install the unit on a flat, level, and fully supported base to prevent stress fractures.

• Use a standard hole saw for fitting inlets, outlets, and overflow pipes to ensure clean apertures.

• Verify that the loft floor structure can support the 400kg static load when the vessel is at full capacity.

• Keep the lid securely fastened to prevent dust, debris, or pests from contaminating the supply.