Circulator pump Termojet AUTO energy-saving APM-F 65/12-340 mm

Termojet AUTO APM-F 65/12-340 mm circulator pump — a large flanged circulating pump of the APM-F series for industrial and commercial heating and cooling systems. Flange connection DN65, installation length 340 mm, maximum head 12 m, maximum flow rate 37 m³/h. The pump is equipped with an ECM permanent-magnet motor and water cooling; the housing is protected by electrophoretic anti-corrosion coating.

Technical Specifications

Operating Modes and Control

Constant differential pressure — Δp-c. The pump maintains the set differential pressure between the supply and return pipelines regardless of the current flow rate. Optimal for large radiator systems and boiler rooms with thermostatic control.

Proportional differential pressure — Δp-v. The differential pressure decreases proportionally to the reduction in flow rate. At partial load the pump automatically reduces speed and power consumption — a noticeable saving in large facilities with a variable load profile throughout the day and season.

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

Applications

• Industrial boiler rooms and large commercial facilities — offices, warehouses, shopping centres — where a flow rate exceeding 25 m³/h is required.
• Heating and cooling systems with DN65 flange connection. For compatible equipment — Termojet Mega series and Termojet pump groups.
• Circulation of heat-transfer fluid in solar energy and domestic hot water systems with temperatures up to 110 °C.
• Replacement of an obsolete DN65 flanged pump in an existing boiler room — installation length 340 mm.
• Large commercial-class heat pump systems requiring high circuit performance.

Why an ECM Motor Is More Cost-Effective Than an Unregulated Pump

An unregulated DN65 pump of comparable performance consumes a fixed, significant amount of power continuously. The APM-F 65/12 consumes 30–710 W depending on the current load: when the flow rate is halved, power consumption drops 3–4 times. The energy efficiency index EEI < 0,21 confirms the energy-saving equipment class. In large facilities with long operating hours the annual electricity savings are substantial.

Water cooling of the motor and wet-rotor technology: no shaft seals or external lubrication, no scheduled maintenance required. The electrophoretic housing coating provides long-term corrosion protection.

• EEI < 0,21 — confirmed energy efficiency class for pumps of this size.
• Water cooling + wet rotor — no maintenance required.
• IP44 — splash protection in boiler rooms.
• Single-phase 230 V supply — simplified installation without three-phase wiring.
• Ukrainian manufacture: no customs delays, fast delivery, official warranty.

For Heat Pump Systems

For large commercial facilities with an industrial-class heat pump, the APM-F 65/12 provides the required flow rate of 37 m³/h at EEI < 0,21. The temperature range 0–110 °C covers all heat pump operating modes. Learn more — Termojet heat pumps.

Frequently Asked Questions

Can the APM-F 65/12 be powered from a single-phase supply?
Yes. Despite its industrial frame size, the APM-F 65/12 pump runs on a single-phase supply of 230 V ± 10% / 50 Hz. Maximum current 3,7 A. This simplifies installation and does not require a separate three-phase distribution.

Are there smaller flanged models for comparison?
Yes. For smaller facilities, APM-F DN40 (220 mm) and APM-F DN50 (280 mm) are available. See the Termojet Mega series and Termojet pump groups.