Replacement Pump Head H4 20/8

The universal electric motor with remote electronic control of the rotor speed of the H4 Series (pump head) is designed to repair and replace motors in modern combination gas boilers with clockwise rotor rotation. The rotor speed of the H4 electric motors is remotely controlled using PWM technology, a low-voltage signal from the boiler's electronic board via a special control cable.

The PWM function is built into the motor processor. Thanks to this built-in feature, H4 series motors can be remotely controlled by any controllers/thermostats like Siemens, Honeywell, and many more, making them suitable for use in any "smart home" system, underfloor heating systems, solar systems, or systems with heat pumps.

These pumps feature 11 automatic work programmes, including 3 constant fixed speeds (“Old School”).

- Automatic Night Power Reduction Function: This reduces the energy consumption of the pump to 5 watts, with no loss in heating system quality, significantly impacting energy savings.

- Electrical and Thermal Protection: Safety systems that prevent pump breakdown due to external reasons not related to the operation of pump systems.

• Set of nuts
• 1.3m cable with a UK plug
• Datasheet
• Packaged in sturdy box
• Free of charge PWM Set of Cables