3P Technik 800 Litre Wall Tank – Professional Grade Garden Water Butt

The 3P Technik 800 Litre Wall Tank is the class-leading slim-profile rainwater storage tank for residential, horticultural, and professional applications. Its space-efficient form stores a genuine 800 litres of rainwater within a compact 80cm x 60cm footprint, fitting neatly against walls, fences, and outbuildings where conventional round water butts simply cannot. With a shot weight of 36kg and 8mm-thick walls, this is a substantially built tank suited to both domestic gardens and demanding commercial environments, including fire water storage and professional irrigation.

Colours, Finishes and Variants

The 800L Wall Tank is available in five attractive, matte-finish colours: Black, Sand, Granite, Blue Grey Granite, and Green — with Green returning for 2026 by popular demand. The Sand, Granite, Blue Grey Granite, and Green finishes feature a subtle fleck effect that adds visual depth. All colours are produced in UV-stabilised, recyclable polyethylene, ensuring that the tank retains its appearance in direct sunlight over many years without fading or surface degradation.

Technical Specification

• Capacity: 800 litres
• Dimensions: 179cm tall, 80cm wide, 60cm deep
• Wall thickness: 8mm. Shot weight: 36kg
• 3 x ¾" BSP brass-threaded connection points: 1 tap point (approx 30cm from ground), 2 interconnection or drain-down points near base
• Supplied with multi-hole-saw set, rubber grommets, wall fixing bracket, and screws
• Tap sold separately — see Tank Services ¾" tap accessories range
• Available colours: Black, Sand, Granite, Blue Grey Granite, Green
• Tanks are inter-linkable for expanded capacity
• Material: UV-stabilised, recyclable polyethylene

Applications and Usage

The 3P Technik 800L Wall Tank is equally at home in domestic gardens and high-demand professional settings. In residential use, it provides a substantial rainwater reserve for garden irrigation, vehicle washing, and outdoor cleaning — reducing mains water consumption significantly. In professional and commercial contexts, the tank has been widely adopted for fire water storage, horticultural nurseries, market garden irrigation, and equestrian yard water supply. Multiple tanks can be inter-linked using connector kits to scale capacity to 1,600, 2,400, or 4,000 litres. A matching 3P Technik Filter Collector is recommended to ensure collected rainwater is filtered at the downpipe before entering the tank, protecting water quality and reducing internal sediment build-up.

Learn more about 3P Technik products here.