3P Technik Rainwater Harvesting Kit B – VF1 Combi System for Roofs up to 450m²

The 3P Technik Rainwater Harvesting Kit B is a complete three-component filtration kit designed for medium-to-large rainwater harvesting installations serving roof catchment areas of up to 450m². The Kit B centres on the 3P Technik VF1 Combi Filter — a high-efficiency, two-step self-cleaning rainwater filter suitable for installation inside or before a storage tank — and combines it with a Calmed Inlet for sediment protection and an Overflow Siphon Uno for surface skimming and overflow management. This kit delivers professional-grade water quality management for commercial buildings, large domestic properties, and mid-size agricultural installations.

What Is Included in Harvesting Kit B

• 3P Technik VF1 Combi Filter (1000592) — two-step self-cleaning rainwater filter with a 0.65mm secondary sieve mesh, suitable for roof areas up to 450m². Installs on the top surface of a storage tank or underground before the tank
• Calmed Inlet (DN100 or DN125) — disperses incoming water at low velocity to protect settled sediment layers and oxygenate the lower water column
• Overflow Siphon Uno — surface-skimming overflow device that removes floating oils, pollen, and debris from the tank surface level at every overflow event

Key Technical Features

• Maximum roof area: 450m² per kit
• VF1 Combi Filter: gravity-fed, no electricity required, self-washing at 0.65mm secondary mesh
• Compatible with DN100 (4") downpipe connections throughout
• Frost-tolerant system design — operational year-round in UK climate conditions
• Compatible with PE, GRP, and concrete rainwater storage tanks
• Retrofittable into existing tank installations

Applications and Usage

Rainwater Harvesting Kit B is the recommended specification for large domestic rainwater harvesting systems, small commercial buildings, and agricultural installations where roof areas fall between 200m² and 450m². Typical applications include large residential properties with connected toilet flushing and washing machine systems; small commercial offices, schools, and light industrial units; farm buildings, stables, and equestrian centres with moderate roof areas; and market garden and nursery irrigation systems. The filtered rainwater meets the non-potable water quality requirements for toilet flushing, washing machines, vehicle washing, and garden and greenhouse irrigation. Kit B can be installed in new build and retrofit scenarios with standard PE, GRP, and concrete tanks.

Learn more about 3P Technik products here.