TopTank 500L Rectangular Loft Water Tank

TopTank 500L Rectangular Tank

The TopTank 500L Water Tank serves as a dedicated liquid storage solution for residential and commercial plumbing systems where vertical clearance is limited. This rectangular unit utilizes food-grade polyethylene to ensure safe potable water containment. Its low-profile design allows for seamless integration into ceiling voids, lofts, and crawl spaces that cannot accommodate standard cylindrical vessels.

Built for the Job

Plumbing contractors and site supervisors specify this container for gravity-fed water systems. The rectangular footprint distributes weight more effectively across floor joists compared to narrow-base units. It functions reliably as a header tank or a secondary storage reservoir in multi-story developments. The rotational molding process creates a seamless body, which prevents leaks at stress points. This material resists corrosion from common water treatment chemicals and prevents the growth of algae when shielded from direct sunlight. Professionals choose this model for its ability to pass through standard internal doorways and access hatches during renovation or new build phases.

• Installation in restricted loft spaces for domestic water supply.

• Secondary containment for industrial liquid storage in low-clearance facilities.

• Gravity-fed header systems for consistent pressure in multi-bathroom layouts.

Product Highlights

Structural Integrity

The ribbed wall construction provides high hoop strength to prevent bulging when the vessel is at maximum capacity.

Material Quality

• Manufactured from UV-stabilized Linear Low-Density Polyethylene (LLDPE).
• Certified food-grade material ensures water remains safe for human consumption.

Ease of Access

Includes a secure, large-diameter manhole cover for straightforward internal cleaning and float valve maintenance.

Technical Specifications

What’s Included

• 1 x 500 Litre Rectangular Storage Vessel

• 1 x Heavy-duty threaded manhole lid

On-Site & Workshop Notes

• Always place the storage unit on a flat, level, and fully supported base to avoid structural deformation.

• Verify that the loft floor or support platform is rated for a static load exceeding 550kg.

• Ensure sufficient overhead clearance remains for removing the lid during routine inspections.

• Use high-quality bulkhead fittings for inlet and outlet connections to maintain a watertight seal.