BritTherm Replacement Pump Head H4 Series H4 25/4 (661996602)

The BritTherm H4 25/4 Replacement Pump Head is a universal electric motor designed for repair and replacement in modern combination gas boilers. Featuring advanced PWM technology for remote rotor speed control, it integrates seamlessly with smart home controllers and diverse heating systems such as underfloor heating, solar, and heat pumps, ensuring efficient and adaptable heating performance.

The BritTherm Replacement Pump Head H4 Series H4 25/4 offers reliable and versatile operation for modern domestic heating solutions. Its universal motor supports clockwise rotor rotation and is controlled remotely via PWM (Pulse Width Modulation) signals from the boiler’s electronic board, connected through a special control cable.

Thanks to the built-in PWM function in the motor processor, the H4 Series motors are compatible with a wide range of controllers and thermostats, including Siemens and Honeywell, making them ideal for smart home systems. This flexibility extends to various heating setups such as underfloor heating, solar thermal systems, and heat pumps.

Equipped with 11 automatic operation modes, including three constant fixed speeds (“Old School”), the pump head offers precise control tailored to your heating system’s needs. Its Automatic Night Power Reduction function lowers energy consumption to a mere 5 watts without compromising heating quality, contributing significantly to energy savings.

Robust electrical and thermal protection mechanisms protect the pump from damage caused by external factors, enhancing durability and reliability.

Features & Benefits:
✅ Universal motor with remote PWM rotor speed control
✅ Compatible with Siemens, Honeywell, and other smart thermostats
✅ Suitable for clockwise rotor rotation in combination boilers
✅ 11 automatic operating programmes, including 3 fixed speeds
✅ Energy-saving night mode reduces power to 5 watts
✅ Ideal for smart homes, underfloor heating, solar, and heat pumps
✅ Built-in electrical and thermal protection for durability
✅ Easy installation with dedicated control cable

• Programs = PWM Controlled Motor
• Maximum Head (Meters) = 4
• Flow (m3/h) = 2.5
• Power = 3~25
• Connection Size = 1 ½”
• Energy Efficiency Index Rating (EEI) = EEI≤0.20
• Maximum System Pressure (KPA) = 10 Bar
• Protection Class = IP44
• Temperature Class = TF 95°C
• Insulation Class = F
• Material = -
• Supplied With (Loose in Box) = electrical cable 0.7 m long, pwm cable, Wilo power wire adaptor,Wilo PWM signal wire adaptor, fastening screws, data sheet and warranty instructions.

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