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In tankless water heater applications, a domestic water recirculation pump functions primarily as a pressure booster rather than a heat-loss compensator. While such pumps traditionally circulate water to offset pipeline heat loss—typically 10 to 20 BTU/hr per linear foot for insulated pipes at standard domestic temperatures (Engineering ToolBox)—the tankless configuration relies on them to stabilize inlet pressure and maintain minimum activation flow. This pressure-boosting role prevents low-flow shutdowns and temperature fluctuations, which are more critical than recirculation volume in instantaneous heating systems.
The CRP050A utilizes a high-efficiency 24V DC brushless motor to ensure quiet and reliable operation. The technical performance profile based on standard laboratory testing is as follows:
| Rated Voltage | 24V DC | Max Flow | 20 L/min (19.5 ± 1 L/min) |
| Rated Power | 48 W (1 ± 10%) | Max Head | 16 ± 1 m |
| Rated Current | 2 A (1 ± 10%) | Waterproof Rating | IP68 |
| Noise Level | ≤ 40dB @ 1m | Medium Temp | -40 ~ 98 ℃ |
| Lifetime | ≥ 2000H | Insulation Class | F (155℃) |
| Weight | 272g | Continuous Pressure | 0.5MPa |
In tankless water heater applications, a domestic hot water recirc pump primarily provides pressure boosting rather than hot-water recirculation. A programmable timer or thermostatic control can reduce annual pump electricity consumption by up to 60% (U.S. DOE, Energy Saver), though the main function is stabilizing inlet pressure and maintaining minimum activation flow. Proper sizing of a home hot water recirculating pump should prioritize pressure head, activation flow threshold, and temperature rating over loop heat-loss compensation. For specialized setups, refer to the catalog of 12V/24V DC Water Pumps or explore custom Liquid Cooling Solutions. This ensures reliable tankless heater operation with an optimal balance between comfort and energy efficiency. For specialized setups, refer to our catalog of 12V/24V DC Water Pumps or explore our custom Liquid Cooling Solutions. Proper sizing of a home hot water recirculating pump ensures optimal balance between comfort and energy efficiency.
| Ambient Temp | -25~55℃ | Color | Black |
| Humidity | Below 90% RH | Weight | 272g |
| Medium | Pure Water / Antifreeze | Rated Power | 48(1±10%) W |
| Medium Temp | -40~98℃ | Noise | ≦ 40dB @ 1m |
| Waterproof | IP68 | Max Flow | 20, 19.5±1 L/min |
| Constant/Continuous Pressure | 1.5MPa / 0.5MPa | Lifetime | ≧ 2000H |
| Rated Voltage | 24V DC | Max Head | 16±1 m |
| Rated Current | 2(1±10%) A | Insulation | F(155℃) |
The pump operates at ≤ 40dB at a distance of 1 meter, making it highly suitable for quiet indoor residential installations near bedrooms or bathrooms.
Yes, the wetted components and sealing materials are designed to safely handle both pure water and standard antifreeze solutions down to -40℃.
The unit is rated for a continuous operating pressure of 0.5MPa and can withstand a constant/burst pressure of up to 1.5MPa.
Under standard rated operating conditions, the high-quality brushless motor provides a tested lifetime of ≥ 2000 hours.
It features Class F insulation, allowing the internal motor windings to safely withstand temperatures up to 155℃ without performance degradation.
