Rainwater Toilet Flush System

Rainwater harvesting is a sustainable and environmentally-friendly solution that saves water consumption by utilizing rainfall, a free source of relatively clean water. One of the ways we can use collected rainwater is for toilet flushing, which accounts for nearly 30% of water use in the average home. In this blog post, we’ll guide you through the process of implementing a rainwater toilet flush system.

What You’ll Need

  • Rainwater collection tank – 1000 Liters EBC Tank
  • 12 V Pump
  • Water filter
  • Electric Floater
  • 12 V Electromagnetic Valve
  • 12V 2A Power Source
  • KY-019 Relay
  • 12V to 5v Voltage Regulator (Buy or Make)
  • Plumbing supplies (pipes, connectors, etc.)
  • Tools (pipe cutter, wrench, etc.)

System Diagram

Electronic Controller



Implementing a rainwater toilet flush system is an excellent way to conserve water and save on your water bills. While the upfront costs can be substantial, the system will pay for itself over time. Plus, you’ll be doing your part to contribute to a more sustainable future.

Remember, the specific steps and materials may vary based on your local climate, the design of your house, and local regulations. Always do your research before starting a project like this, and don’t hesitate to seek professional help if needed. Happy harvesting!