Circulator pump Termojet AUTO energy-saving APM-F 40/18-250 mm

Termojet AUTO APM-F 40/18-250 mm circulating pump — a flanged energy-saving pump with an ECM motor for industrial and commercial heating systems. Connection DN40 flange, installation length 250 mm, power consumption 25–670 W, maximum head 18 m, maximum flow rate 24 m³/h. The built-in frequency converter smoothly regulates the speed from minimum to maximum — the pump adapts to the current load and consumes exactly what the system needs.

Technical specifications

Operating modes

Constant differential pressure — Δp-c. The pump maintains a set pressure difference between the supply and return regardless of flow rate. Standard mode for large radiator systems and boiler rooms: when valves on individual branches close, the pump smoothly reduces speed and does not overload the system with excess pressure.

Proportional differential pressure — Δp-v. The differential pressure decreases proportionally to the flow rate. Optimal for systems with variable load, where the demand for heat carrier fluctuates constantly: commercial facilities, industrial boiler rooms with multiple circuits.

Why an ECM motor is more cost-effective in large flanged pumps

Flanged pumps of this class in unregulated versions consume several hundred watts continuously. The ECM motor of the APM-F 40/18 reduces speed along with the load — the actual average consumption during the heating season is significantly lower than the maximum value of 670 W. The electrophoretic coating of the housing prevents corrosion. Reliable EPDM rubber seals require no maintenance. Water cooling of the motor — the heat carrier cools the stator directly, noise level up to 50 dB.

Applications

• Boiler rooms of commercial buildings, office and warehouse premises with large areas.
• Industrial heating systems requiring flow rates above 10 m³/h and head above 12 m.
• Solar energy systems and domestic hot water (DHW) — fluid temperature up to 110°C.
• Replacement of unregulated DN40 flanged pumps with a transition to ECM class. See the Termojet Mega series and Termojet pump groups.

APM-F 40/18 and a heat pump system

For large commercial systems with a heat pump, where the HP serves a branched network and a flow rate above 10 m³/h is required, the APM-F 40/18 is the right choice. The ECM class minimises pump electricity consumption and does not reduce the overall system COP. The Δp-v mode allows the pump to automatically adapt to the variable output of the heat pump. More details on the Termojet heat pumps page.

Advantages:

• head 18 m, flow rate 24 m³/h — for large commercial facilities;
• ECM motor with water cooling: regulation from 25 to 670 W;
• electrophoretic housing coating, EPDM seals — maintenance-free;
• fluid temperature up to 110°C, pressure up to 10 bar.

Frequently asked questions

Does the APM-F require maintenance?
EPDM rubber seals do not need replacement with normal heat carrier quality. The water-cooled motor has no wearing shaft seals. Maintenance is limited to checking the heat carrier quality and cleaning the filter upstream of the pump.

What pressure can the APM-F 40/18 withstand?
Maximum system working pressure — 1,0 MPa (10 bar). This is the standard for commercial heating systems. For systems with higher pressure, contact a Termojet manager to select the appropriate model.