AirFlow Condensate Units & Condensate Recovery Units
Packaged electric condensate units for collecting and returning condensate in commercial HVAC, boiler-room and industrial steam applications. AirFlow units are available in simplex and duplex configurations with receiver capacities from 10 through 500 gallons.
Electric Condensate Units for Steam Systems
AirFlow condensate units collect condensate in a vented receiver. As the condensate level rises, a float-operated control starts the pump and transfers the collected water back toward the boiler room or other condensate-handling equipment.
These packaged assemblies combine the receiver, pump or pumps and operating controls into a single condensate recovery unit.
10–500 Gallon Receivers
Multiple receiver capacities are available for a wide range of commercial and industrial condensate loads.
Simplex & Duplex
Choose single-pump simplex or two-pump duplex configurations based on system requirements and receiver size.
Multiple Pump Sizes
Pump selection is based on required condensate flow and the discharge pressure or total head the pump must overcome.
Packaged Options
Stainless receivers, motor options, control panels, gauge glass, valves and other accessories are available.
AirFlow condensate units and condensate recovery units are a separate packaged equipment line supplied by Rema. They are distinct from the Rema condensate return and boiler feed systems manufactured by Rema.
Where Condensate Recovery Units Are Used
Electric condensate units are used where condensate cannot reliably return by gravity alone or where the pump must overcome elevation, long piping runs or backpressure in the return system. They can serve both building-heating and process-steam applications.
Commercial HVAC & Steam Heating
Steam heating systems in schools, hospitals, apartment buildings, office buildings and institutional facilities.
Boiler Rooms
Collect condensate from remote returns and pump it back toward the boiler room or feedwater equipment.
Industrial & Process Steam
Return condensate from steam coils, heat exchangers, process vessels and other steam-using equipment.
Laundry & Dry Cleaning
Steam presses, finishing equipment and other commercial laundry or garment-care equipment using steam.
Food & Beverage Processing
Steam-heated processing equipment where condensate is collected and returned for reuse.
Manufacturing & Institutional Facilities
Facilities with distributed steam loads and multiple condensate return points throughout the building or plant.
AirFlow Condensate Unit Sizes
AirFlow condensate recovery units are available with receiver capacities from 10 through 500 gallons. Select a size below to view its dimensional drawing.
Receiver capacity and pump selection are separate sizing considerations. The receiver handles condensate collection, while the pump must deliver the required flow at the required discharge pressure.
How to Size an AirFlow Condensate Unit
AirFlow bases condensate-unit selection on the system EDR rating. EDR is used to determine required condensate pumping capacity and a recommended receiver size. Pump selection is then based on the required discharge pressure.
AirFlow Receiver Selection Reference
| EDR | Required GPM | Recommended Unit |
|---|---|---|
| 1,000 | 1.5 GPM | 10 gal Simplex or 20 gal Duplex |
| 2,000 | 3 GPM | 10 gal Simplex or 20 gal Duplex |
| 4,000 | 6 GPM | 10 gal Simplex or 20 gal Duplex |
| 6,000 | 9 GPM | 20 or 40 gal Duplex |
| 10,000 | 15 GPM | 20 or 40 gal Duplex |
| 20,000 | 30 GPM | 65 gal Duplex |
| 25,000 | 37.5 GPM | 65 gal Duplex |
| 30,000 | 45 GPM | 65 gal Duplex |
| 40,000 | 60 GPM | 65 gal Duplex |
| 50,000 | 75 GPM | 65 gal Duplex |
| 65,000 | 97.5 GPM | 110 gal Duplex |
| 80,000 | 120 GPM | 110 gal Duplex |
| 100,000 | 150 GPM | 110 gal Duplex |
Simplex and Duplex Condensate Units
AirFlow condensate recovery units are available in both single-pump and dual-pump configurations depending on receiver size and application requirements.
Simplex Condensate Units
Simplex units use one electric condensate pump and are used where a single pump provides the required capacity and discharge performance.
Duplex Condensate Units
Duplex units use two pumps and may be configured for alternating operation, additional pumping capacity or redundancy depending on the controls.
Large Condensate Recovery Units
AirFlow also manufactures larger packaged condensate units for applications requiring greater receiver capacity and pumping capability.
Larger packages can incorporate duplex pumping, control panels, gauge glass, thermometers, makeup-water equipment and additional system accessories.
Receiver capacity and pump performance should be evaluated independently. The receiver stores the incoming condensate; the pump must deliver the required flow at the actual discharge head.
AirFlow Drawings, Pump Curves & Owner’s Manual
Access dimensional drawings, pump-performance curves and AirFlow installation, operating and service information.
Dimensional Drawings
Pump Performance Curves
Owner’s Manual
Installation, operation, maintenance and service information for AirFlow condensate and boiler-feed equipment.
View Owner’s ManualImportant Installation Considerations
These points are based on AirFlow’s installation and operating instructions. Refer to the complete owner’s manual and applicable codes for complete installation requirements.
- Install the receiver below the lowest condensate return where practical so the return lines can remain dry.
- Keep the receiver vent open to atmosphere so air and vapor can escape as condensate enters the receiver.
- Install a spring-loaded check valve in the discharge piping as close to the pump as practical.
- AirFlow recommends increasing the discharge pipe one size when the discharge run exceeds 50 feet.
- Verify that pump capacity and discharge pressure match the actual requirements of the system.
- Never operate the pump with an empty receiver because dry operation can damage the mechanical shaft seal.
- Confirm motor voltage and proper rotation before placing the unit into service.
- AirFlow specifies that the first connection to a stainless steel receiver must be brass.
AirFlow Condensate Unit Options
Available options vary by receiver size, pump horsepower and unit configuration.
Stainless Steel Receivers
Stainless receiver upgrades are available for applications requiring stainless construction.
Motor Options
TEFC, washdown and other motor configurations may be available depending on horsepower and application.
Control Panels
Simplex and duplex control arrangements and panel options are available for packaged units.
Accessories
Accessories include isolation valves, thermometers, drain valves, liquid-level gauge glass and related options.
AirFlow Condensate Unit FAQ
What is a condensate unit?
Is a condensate unit the same as a boiler feed unit?
What is a condensate recovery unit?
When is a condensate pump required?
How do I determine the correct receiver size?
How is pump horsepower selected?
What is the difference between simplex and duplex?
Does the receiver need to be vented?
Can the condensate pump run dry?
Can Rema help replace an existing condensate unit?
Need Help Selecting an AirFlow Condensate Unit?
For unit selection, provide the boiler horsepower or steam load, required condensate flow if known, discharge pressure or total head, voltage and phase, and information on the existing equipment if this is a replacement.