Choosing The Right Circulating Pump For Your Boiler System

When it comes to a boiler system, one of the most important components is the circulating pump. This pump is responsible for circulating the hot water throughout the system, ensuring that the heat is distributed evenly and efficiently. Choosing the right circulating pump from sites like for your boiler system is crucial to its performance and longevity. In this article, we will explore the factors to consider when selecting a circulating pump and provide some tips to help you make the right choice.

1. Determine the Flow Rate and Head

The first step in choosing the right circulating pump for your boiler system is to determine the flow rate and head requirements. The flow rate refers to the amount of water that needs to be circulated through the system, while the head refers to the pressure that the pump needs to overcome to move the water. These two factors are crucial in determining the size and power of the pump you need.

2. Consider the Pump Type

There are several types of circulating pumps available in the market, each with its own advantages and disadvantages. The most common types include:

  1. Centrifugal pumps: These are the most widely used type of circulating pumps. They work by using a rotating impeller to create centrifugal force, which pushes the fluid through the system. Centrifugal pumps are known for their high flow rates and efficiency, making them suitable for large-scale applications. However, they may struggle with high-viscosity fluids and require regular maintenance.
  2. Recirculating pumps: These pumps are designed to recirculate fluid within a closed system, such as in heating or cooling systems. They are typically smaller and more compact than centrifugal pumps, making them easier to install and maintain. Recirculating pumps are known for their durability and reliability, but they may have lower flow rates compared to centrifugal pumps.
  3. Submersible pumps: As the name suggests, submersible pumps are designed to be submerged in the fluid they are circulating. They are commonly used in sump pumps, wastewater treatment plants, and deep wells. Submersible pumps are known for their high efficiency and ability to handle abrasive or corrosive fluids. However, they may be more expensive and require professional installation.
  4. Gear pump: Gear pumps work by using rotating gears to create suction and move the fluid through the system. They are often used for low-flow applications or when precise control is required. Gear pumps are known for their compact size and quiet operation. However, they may be less efficient than centrifugal pumps and can be prone to leakage.
  5. Vane pumps: Vane pumps use rotating vanes or blades to move the fluid. They are commonly used in hydraulic systems and automotive applications. Vane pumps are known for their high efficiency and ability to handle high-viscosity fluids. However, they may require more maintenance and can be sensitive to contaminants in the fluid.

3. Consider the Efficiency

When selecting a circulating pump for your boiler system, it is important to consider its efficiency. An efficient pump can help reduce energy consumption and lower operating costs. The efficiency of a pump is usually indicated by its Energy Efficiency Index (EEI), which is a measure of its energy consumption compared to a reference pump.

4. Check the Noise Level

The noise level of a circulating pump is another important factor to consider, especially if the pump will be installed in a residential or noise-sensitive area. Some pumps can produce loud vibrations and humming noises, which can be disruptive and annoying. Look for pumps that are designed with noise-reducing features such as rubber mounts and insulated housings.

5. Look for Quality and Reliability

When investing in a circulating pump for your boiler system, it is important to choose a pump that is of high quality and reliability. A well-built pump can withstand the demands of continuous operation and provide long-lasting performance.


Choosing the right circulating pump for your boiler system is crucial to its overall performance and efficiency. By considering factors such as flow rate and head requirements, pump type, efficiency, noise level, and quality, you can make an informed decision that meets the specific needs of your system. Investing in a high-quality and reliable pump will not only ensure optimal heating performance but also result in energy savings and lower operating costs in the long run.