A jet pump, commonly used in rainwater harvesting systems, utilizes suction to draw water from a well or storage tank. It operates by creating a pressure differential that forces water up through a narrow pipe. Jet pumps are typically cost-effective and suitable for shallow wells or situations where the water source is relatively close to the surface. However, they may require more maintenance and can be less efficient than other pump types.

On-demand pumps, also known as pressure pumps, are a popular choice for rainwater harvesting systems due to their efficiency and versatility. These pumps are designed to activate automatically when a demand for water is detected, such as when a faucet is turned on. On-demand pumps maintain consistent pressure throughout the system, providing reliable water flow for various household tasks. They are ideal for rainwater harvesting systems where water usage fluctuates and energy efficiency is a priority.

Pumps equipped with Variable Frequency Drives (VFDs) offer advanced control over water flow and energy consumption in rainwater harvesting systems. VFDs adjust the speed of the pump motor to match the required water output, resulting in significant energy savings compared to traditional fixed-speed pumps. This flexibility makes VFD pumps well-suited for rainwater harvesting applications where demand varies widely or where precise control over water pressure is necessary. While VFD pumps may have a higher initial cost, their energy-saving capabilities often result in long-term cost savings and reduced environmental impact.