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HVAC Pumps: Circulation, Condenser & End-Suction

HVAC systems rely on pumps to circulate chilled water, hot water and condenser water through the building or plant. This page covers recirculation, condenser water, thermal energy storage, end-suction, vertical inline and split case pumps, regenerative turbines and submersible multistage pumps. Flotronics supports pump selection and sourcing.

  • Recirculation or circulator pumps
  • Condenser water and TES pumps
  • End-suction and vertical inline pumps
  • Split case pumps
  • Submersible multistage pumps
HVAC Pumps: Circulation, Condenser & End-Suction

Application-first selection

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Quotation against your specs

Every quote references the parameters you sent, so comparisons are like-for-like.

Engineer-to-engineer support

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Pumps by Industry

Range, specifications & options

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Recirculation Pumps

Condenser water pumps

TES Pumps

End-Suction pumps

Vertical inline Pumps

Split Case Pumps

Regenerative Turbines

Submersible Multi-Stage Pumps

Recirculation Pumps:

Recirculation Pumps

Recirculation pumps, also known as circulator pumps or recirculating pumps, are a type of centrifugal pump designed for closed-loop systems. Their primary function is to continuously circulate water or another heat transfer fluid within an HVAC system. These pumps are commonly used in both residential and commercial settings.

Working Principle:

Recirculation pumps operate by using a rotating impeller driven by a motor. As the impeller spins, it imparts kinetic energy to the fluid, creating high-pressure areas at the edges and a low-pressure area at the center. This pressure difference forces the fluid outward into the pump housing. The pumped fluid is then directed into the HVAC system's pipes, where it circulates through heating or cooling components. Many recirculation pumps come with variable speed drives (VFDs) for precise flow control, improving energy efficiency.

Usage:

Commonly used in hydronic heating and cooling systems to ensure even temperature distribution.

Specifications

Flow Rate 10 - 150 gallons per minute (LPM)
Head Pressure 10 - 50 feet
Motor Power 0.25 - 10 horsepower (HP)
Pipe Connection Size 1/2" - 2" NPT (National Pipe Thread)
Voltage 120V or 240V AC, single-phase or three-phase
Material of Construction Stainless steel, cast iron, or bronze
Control Options Manual, automatic, or variable speed control with VFD
Efficiency High-efficiency
Operating Temperature -20°F to 250°F (-29°C to 121°C)

Condenser water pumps

HVAC Condenser water pump

Condenser water pumps

Condenser water pumps are specialized centrifugal pumps designed for the specific task of moving water through the condenser portion of an HVAC system. These pumps play a pivotal role in the heat rejection process, allowing the system to efficiently transfer heat from the building's interior to the outside environment.

Working Principle:

The condenser water pump motor spins an impeller in the pump, which adds energy to the water, making high-pressure areas at the edges and low-pressure areas in the middle. This pressure difference pushes the water out into the system. The high-pressure water goes to the condenser coils, where it takes heat from the refrigerant, turning it from a gas to a liquid. After cooling down, the water goes back to the pump to start the process again.

Usage:

Condenser water pumps are primarily used in chiller plants and large-scale HVAC systems. Their role is vital for achieving effective cooling in air conditioning systems, particularly in commercial and industrial settings.

Specifications

Flow Rate 50 - 1500 gallons per minute (LPM)
Head Pressure 40 - 200 feet
Motor Power 10 - 100 horsepower (HP)
Pipe Connection Size 2" - 10" NPT (National Pipe Thread)
Voltage 208V, 230V, 460V AC, three-phase
Material of Construction cast iron or bronze
Control Options Manual, automatic, or variable speed control with VFD
Efficiency High-efficiency

TES Pumps

Thermal Energy Storage pumps

TES Pumps

TES (Thermal Energy Storage) pumps are essential components in thermal energy storage systems. These pumps facilitate the efficient storage and release of thermal energy, contributing to energy management and sustainability.

Working Principle:

TES pumps operate by circulating a heat transfer fluid, such as water or specialized fluids, to and from thermal storage tanks. This fluid absorbs and stores excess thermal energy during off-peak periods and releases it when needed for heating or cooling.

Usage:

TES pumps are integral to HVAC (Heating, Ventilation, and Air Conditioning) systems and industrial processes where load shifting and energy conservation are crucial. They are commonly used in commercial buildings, district energy systems, and renewable energy applications.

Specifications

Flow Rate 50 - 500 gallons per minute (LPM)
Head Pressure 10 - 100 feet
Motor Power 5 - 50 horsepower (HP)
Pipe Connection Size 2" - 6" NPT (National Pipe Thread)
Voltage 208V, 230V, 460V AC, three-phase
Material of Construction Stainless steel, cast iron, or specialized material
Control Options Manual, automatic, or variable speed control with VFD
Efficiency High-efficiency models available for energy savings
Operating Temperature -20°F to 250°F (-29°C to 121°C)

End-Suction pumps

End-Suction pumps

End-Suction pumps

End-suction pumps are a common type of centrifugal pump used in various industries and applications. They are characterized by having a single inlet and a single outlet, making them versatile and easy to install.

Working Principle:

End-suction pumps work on the principle of centrifugal force. A motor-driven impeller inside the pump housing rotates, creating a centrifugal force that pushes fluid toward the outer edges of the impeller. This action generates suction at the center of the impeller, drawing fluid into the pump. The rotating impeller then propels the fluid outward, increasing its pressure as it exits through the outlet.

Usage:

End-suction pumps are widely employed in various applications, including water supply, irrigation, HVAC systems, industrial processes, and wastewater handling. They are known for their reliability and ease of maintenance, making them a popular choice for many fluid transfer tasks.

Specifications

Flow Rate 50 - 5,000 gallons per minute (LPM)
Head Pressure 20 - 500 feet
Motor Power 1 - 200 horsepower (HP)
Pipe Connection Size 1" - 12" NPT (National Pipe Thread)
Voltage 208V, 230V, 460V AC, three-phase
Material of Construction Cast iron, bronze, stainless steel, or other materials
Control Options Manual or automatic control options
Efficiency High-efficiency models available for energy savings
Operating Temperature -20°F to 250°F (-29°C to 121°C)

Vertical inline Pumps

Vertical inline Pumps

Vertical inline Pumps

Vertical inline pumps are a type of centrifugal pump known for their space-saving design and ease of installation. They have a vertically aligned configuration, where the motor and pump are integrated into a single unit, making them ideal for applications with limited floor space.

Working Principle:

The working principle of vertical inline pumps is based on centrifugal force. An electric motor drives the impeller, which is positioned vertically within the pump casing. As the impeller rotates, it creates a centrifugal force that draws fluid into the center of the impeller. The fluid is then expelled radially outward, increasing in pressure as it exits through the discharge outlet.

Usage:

Vertical inline pumps find extensive use in various applications, including water supply systems, HVAC (Heating, Ventilation, and Air Conditioning), pressure boosting, industrial processes, and municipal water treatment. Their compact design and efficient operation make them suitable for environments where space is at a premium.

Specifications

Flow Rate 50 - 1,000 gallons per minute (LPM
Head Pressure 30 - 200 feet
Motor Power 1 - 100 horsepower (HP)
Pipe Connection Size 2" - 8" NPT (National Pipe Thread)
Voltage 208V, 230V, 460V AC, three-phase
Material of Construction Cast iron, stainless steel, or other materials
Control Options Manual, automatic, or variable speed control with VFD
Efficiency High-efficiency models available for energy savings
Operating Temperature -20°F to 250°F (-29°C to 121°C)

Split Case Pumps

Split Case Pumps

Split Case Pumps

Split case pumps are a type of centrifugal pump designed with a split casing, allowing easy access to internal components for maintenance. They are known for their robust construction and reliability in various industrial and municipal applications.

Working Principle:

Split case pumps operate based on the centrifugal force principle. A motor-driven impeller rotates within the split casing, drawing fluid into the pump through the suction inlet. As the impeller spins, it imparts kinetic energy to the fluid, creating high-pressure regions at the periphery. The fluid is then expelled through the discharge outlet at increased pressure.

Usage:

Split case pumps are widely used in applications where high flow rates and high-pressure capabilities are required. Common applications include water supply for municipal systems, industrial processes, agriculture, and HVAC systems. Their design makes them suitable for tasks such as water distribution, circulation, and transfer in large-scale operations.

Specifications

Flow Rate 200 - 10,000 gallons per minute (LPM
Head Pressure 50 - 500 feet
Motor Power 10 - 500 horsepower (HP)
Pipe Connection Size 4" - 24" NPT (National Pipe Thread)
Voltage 208V, 230V, 460V AC, three-phase
Material of Construction Cast iron, stainless steel, or other materials
Control Options Manual or automatic control options
Efficiency High-efficiency models available for energy savings
Operating Temperature -20°F to 250°F (-29°C to 121°C)

Regenerative Turbines:

Regenerative Turbines

Regenerative Turbines:

Regenerative turbines are a type of energy conversion device used to extract mechanical work from a flowing fluid, typically steam or liquid, through a specific design that harnesses the fluid's kinetic energy.

Working Principle:

Split case pumps operate based on the centrifugal force principle. A motor-driven impeller rotates within the split casing, drawing fluid into the pump through the suction inlet. As the impeller spins, it imparts kinetic energy to the fluid, creating high-pressure regions at the periphery. The fluid is then expelled through the discharge outlet at increased pressure.

Usage:

Regenerative turbines find application in a range of industries, including power generation, chemical processing, and water desalination. They are particularly useful in situations where high efficiency and compact design are essential. Common applications include small-scale power generation, low-flow fluid pumping, and processes that involve the controlled release of energy.

Selection guide

What to specify for an accurate quotation

These parameters decide which variant suits your duty. Send what you know — unknown values can be marked for engineering assistance.

Liquid and temperature
Clean water, chemicals and hot liquids need different materials, seals and pump types.
Flow rate
State the duty flow so the pump and motor can be sized.
Total head or pressure
Static lift, delivery height and friction losses set the head required.
Power supply
Single or three phase, or engine drive, as available on site.
Materials of construction
Wetted parts must suit the liquid and avoid corrosion.
Duty cycle
Continuous or intermittent operation affects bearing, seal and motor choice.
System type
Closed loop or open loop influences pump style.

Typical applications

  • Chilled water circulation
  • Condenser water loops
  • Hot water heating systems
  • Thermal energy storage
  • Cooling tower systems

FAQ

Frequently asked questions

Answers to the questions buyers most often ask before requesting a quotation.

What is a recirculation pump?

A centrifugal pump designed for closed-loop systems, continuously circulating water through the system.

Which pump suits a chilled water loop?

End-suction, inline and split case pumps are common, chosen by flow, head and space. Share your duty.

Can variable speed drives be used?

Variable speed control is widely used in HVAC to cut energy. Ask us about drive options.

Need an HVAC pump?

Send the system flow, head, fluid temperature and power supply for a quotation, or ask an engineer for help.