Circulator pump Termojet AUTO energy-saving APE 25/60/180 mm

Termojet AUTO APE 25/60/180 mm circulator pump — an energy-saving circulation pump with an ECM permanent-magnet motor and wet rotor. Installation length 180 mm, threaded connection 1″ female (internal thread union nut), power consumption 5–45 W. Designed for closed hydronic heating systems: radiator circuits, underfloor heating, and pump groups with 180 mm installation size. A direct replacement for old 3-speed pumps with 180 mm installation length — no pipework modification required.

Technical Specifications

Operating Modes

Constant differential pressure — Δp-c. The pump maintains the set pressure differential between the supply and return lines regardless of how many thermostatic valves are open. Recommended for classic radiator heating: when valves close, the pump does not exceed the set pressure but instead reduces speed and power consumption.

Proportional differential pressure — Δp-v. The differential pressure decreases proportionally to flow. When underfloor heating circuits partially close, the pump automatically reduces pressure and consumption — less noise, lower electricity bills. Δp-v mode is optimal for underfloor heating systems and combined schemes.

Why the ECM Motor Pays Off

A conventional 3-speed pump consumes 80–100 W continuously at the selected speed. The ECM permanent-magnet motor smoothly adjusts speed via an integrated inverter: in a real system, average consumption is well below the 45 W maximum, especially during the shoulder seasons. The wet rotor is submerged in the heating medium: the fluid cools and lubricates the rotor without shaft seals. No maintenance required throughout the entire service life.

Applications

• Replacement of worn 3-speed pumps with 180 mm installation length — no pipework modification needed.
• Radiator heating in buildings already piped for a 180 mm pump.
• Underfloor heating via 180 mm pump groups: NG-48 (180 mm) and NG-47 (180 mm).
• Compatible replacement for imported pumps of the same 180 mm size class.

APE 25/60/180 and Heat Pump Systems

When a building is heated by a heat pump, the ECM energy class of the circulator becomes critical: the heat pump already draws a significant amount of electricity. APE 25/60 in Δp-v mode automatically adapts to the heat pump's variable load — lower consumption, higher overall system COP. For more information on heat pumps and compatible equipment, visit the Termojet heat pumps page.

Advantages:

• consumption 5–45 W versus 80–100 W for a 3-speed pump;
• wet rotor — zero maintenance;
• 180 mm installation length and 1″ female connection — direct drop-in replacement;
• Ukrainian manufacture: fast delivery, service without customs delays.

Frequently Asked Questions

How do I find out the installation length of my old pump?
Measure the distance between the centres of the threaded connections on the old pump body. If it is 180 mm — APE 25/60/180 fits without any pipework modification or additional adapters.

Is APE 25/60/180 compatible with Termojet pump groups?
Yes. The pump is compatible with NG-48 and NG-47 pump groups designed for 180 mm installation length. The full list of compatible groups is in the Termojet pump group catalogue.

A pump of this size covers a boiler circuit of up to 25 kW — for example in the hookup of the 15 kW Termojet Ignis Pro 15 Plus pellet boiler.