Circulator pump Termojet AUTO energy-saving APM 32/12/180 mm

Termojet AUTO APM 32/12/180 mm circulation pump — an energy-saving circulation pump with an ECM permanent-magnet motor and wet rotor for large and commercial heating systems. Installation length 180 mm, threaded connection 1¼″ BSP (internal thread of union nut), power consumption 5–180 W, maximum head 12 m, maximum flow rate 10 m³/h. The optimal choice for boiler rooms with a branched network where the standard head of the APE series is no longer sufficient.

Technical Specifications

Operating Modes

Constant differential pressure — Δp-c. The pump maintains the set pressure difference between supply and return regardless of the flow rate. When thermostatic valves are partially closed in a large system, the pump does not build up excess pressure but smoothly reduces its speed — less noise, less consumption.

Proportional differential pressure — Δp-v. The differential pressure decreases proportionally with the flow rate. Δp-v mode is the right choice for large underfloor heating systems and combined schemes where the load changes continuously depending on valve opening/closing.

Why ECM Motors Are More Economical in High-Power Pumps

A pump with a maximum consumption of 180 W running continuously at maximum speed represents significant electricity costs over a heating season. The ECM motor of the APM 32/12 reduces speed according to the load: at minimum flow, consumption drops to 5 W. The actual average consumption in heating systems is significantly lower than the maximum. The wet rotor (the heat transfer fluid cools and lubricates the rotor without shaft seals) ensures quiet operation and freedom from maintenance.

Applications

• Boiler rooms of large private houses and commercial facilities with an area exceeding 300–500 m².
• Systems with increased hydraulic resistance: multiple floors, complex pipework, balancing valves.
• Pump groups with 180 mm installation length: NG-51.150 (180 mm) and NG-52.150 (180 mm).
• Replacement of uncontrolled high-power 180 mm pumps with a switch to ECM class and significant energy savings.

APM 32/12 and Heat Pump Systems

For large systems with a heat pump where the heat pump serves several underfloor heating zones or a multi-storey system, the APM 32/12 provides the required head and flow rate. Δp-v mode allows the pump to synchronously reduce the load together with the heat pump — the overall system COP increases. More details on the Termojet heat pumps page.

Advantages:

• head 12 m and flow rate 10 m³/h — for large and complex systems;
• ECM motor: from 5 to 180 W depending on load;
• wet rotor — zero maintenance;
• installation length 180 mm, connection 1¼″ BSP.

Frequently Asked Questions

What is the difference between APM 25/12 and APM 32/12?
Both models have the same Hmax 12 m and Qmax 10 m³/h. The difference lies in the body size and the hydraulic characteristics of the pump curve. When choosing between them, we recommend consulting a Termojet manager depending on the specific parameters of your system.

Is the APM 32/12 compatible with Termojet pump groups?
Yes, compatible with pump groups NG-51.150 and NG-52.150 (installation length 180 mm). Verify the 1¼″ BSP thread compatibility before installation.