Circulator pump Termojet AUTO energy-saving APM-F 50/18-280 mm

Termojet AUTO APM-F 50/18-280 mm circulating pump — a powerful flanged circulating pump of the APM-F series for large heating, cooling and domestic hot water systems. Flanged connection DN50, installation length 280 mm, maximum head 18 m, maximum flow rate 31 m³/h. Compared to the APM-F 50/10 model, this version provides twice the head — for systems with increased hydraulic resistance of branched pipework.

Technical Specifications

Operating Modes and Control

Constant differential pressure — Δp-c. The pump maintains the set pressure difference between supply and return pipe regardless of the current system load. For large commercial heating systems with thermostatic control — stable system balance at any degree of regulator opening.

Proportional differential pressure — Δp-v. As the flow rate decreases, the differential pressure decreases proportionally — the pump reduces speed and consumption. For large facilities with a variable load profile throughout the day and season — noticeable electricity savings.

Motor shaft — horizontal position. Heat transfer medium — clean liquid free of solid particles and mineral oils, chemically neutral.

Applications

• Large commercial boiler rooms and industrial heating systems with increased hydraulic resistance, where the APM-F 50/10 with 10 m head is insufficient.
• Heating systems for high-rise and large horizontally branched buildings with DN50 flanged connection. For compatible equipment — Termojet Mega series and Termojet pump groups.
• Heat transfer medium circulation in solar energy and domestic hot water systems with temperatures of 0–110 °C.
• Replacement of an outdated DN50 flanged pump in a boiler room where increased head is required.
• High-capacity heat pump systems with branched underfloor heating layout and increased hydraulic resistance.

Why ECM is More Advantageous Than an Unregulated Pump

An unregulated DN50 pump with comparable head consumes significant constant power regardless of load. The APM-F 50/18 with ECM motor consumes only the required power: the energy efficiency index EEI < 0,21 confirms the energy-saving equipment class. Water-cooled motor and wet rotor: no shaft seals or external lubrication, no scheduled maintenance. Electrophoretic housing coating protects against corrosion during long-term operation.

• EEI < 0,21 — confirmed energy efficiency class.
• Hmax 18 m — for systems with increased hydraulic resistance.
• IP44 — splash protection in boiler rooms.
• Single-phase 230 V power supply — simplified installation without three-phase wiring.
• Ukrainian manufacture: no customs delays, fast delivery, official warranty.

For Heat Pump Systems

In large commercial buildings, an industrial-class heat pump may require a pump with more than 10 m head to overcome the hydraulic resistance of a branched system. The APM-F 50/18 with Hmax 18 m and Qmax 31 m³/h is the answer to this need at EEI < 0,21. The temperature range 0–110 °C covers all heat pump operating modes. More details — Termojet heat pumps.

Frequently Asked Questions

How does the APM-F 50/18 differ from the APM-F 50/10?
Both models have a DN50 flange and installation length of 280 mm. The main difference is head: APM-F 50/18 provides Hmax 18 m (vs. 10 m for the 50/10) for systems with increased hydraulic resistance. The flow rate of the 50/18 is 31 m³/h (vs. 25 m³/h for the 50/10). If the calculated system resistance is up to 10 m — choose the APM-F 50/10 as the more economical option.

Is a three-phase power supply required?
No. The APM-F 50/18 is powered by a single-phase supply 230 V ± 10% / 50 Hz. This simplifies installation in boiler rooms without three-phase wiring. See Termojet Mega series and Termojet pump groups.