Circulator pump Termojet AUTO energy-saving APE 20/60/130 mm

Termojet AUTO APE 20/60/130 mm circulator pump — an energy-saving wet-rotor circulator with an ECM permanent-magnet motor. Designed for closed-loop hydronic heating systems: radiator circuits, underfloor heating, and pump groups. Installation length 130 mm, threaded connection 1″ IG (internal thread of union nut), power consumption 5–45 W — the built-in frequency inverter smoothly modulates speed so the pump uses exactly as much electricity as the system needs at any given moment.

Technical Specifications

Operating Modes

Constant differential pressure — Δp-c. The pump maintains the set pressure difference between the supply and return pipes regardless of how many thermostatic valves are open. This is the standard mode for conventional radiator heating: when some rooms have reached temperature and their valves have closed, the pump does not exceed the set pressure but instead reduces its speed.

Proportional differential pressure — Δp-v. The differential pressure decreases proportionally to the flow rate. When underfloor heating circuits partially close, the pump automatically reduces both pressure and consumption. The Δp-v mode is the optimal choice for underfloor heating systems and combined "underfloor + radiator" configurations.

Why an ECM motor is more cost-effective

A conventional 3-speed pump consumes 80–100 W continuously regardless of load. An ECM permanent-magnet motor with a built-in inverter reduces speed in line with system demand: during mild weather, at minimum load, the pump may consume less than 10 W. The wet rotor is submerged in the heat-transfer fluid — the liquid cools and lubricates the rotor without shaft seals or external lubrication. No wear, no maintenance throughout the entire service life.

Applications

• Radiator heating in a private house (gas, solid-fuel, or electric boiler) — Δp-c mode.
• Underfloor heating via a pump group or manifold. The 130 mm installation length is the standard for the NG-46 pump group (130 mm) and the NG-48 pump group with mixer (130 mm).
• Replacement of a worn pump with a 130 mm installation length without any pipework modification.
• Drop-in replacement for imported pumps of equivalent frame size — standard mounting dimensions, ECM class.

APE 20/60 and heat pump systems

A heat pump produces heat-transfer fluid at 30–55°C — the ideal range for underfloor heating and low-temperature radiators. Every extra watt consumed by the circulator reduces the system's actual COP, so ECM-class consumption is critically important here. The Δp-v mode allows the APE 20/60 to automatically adapt to the variable load of the heat pump. For more information about heat pumps and compatible equipment, visit the Termojet heat pumps page.

Advantages:

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

Frequently Asked Questions

Is the APE 20/60 suitable for installation in a 130 mm pump group?
Yes. The 130 mm installation length matches the standard of the Termojet NG-46 and NG-48 pump groups. The pump fits without adapters or modifications.

Which mode should I choose for radiator heating?
The Δp-c mode (constant differential pressure) is the standard for radiator systems with thermostatic valves. The mode is selected during commissioning and requires no further adjustment.