BritTherm Replacement Pump Head H3 Series H3 25/6 (661996505)

The BritTherm H3 25/6 Replacement Pump Head is a high-efficiency solution designed for modern combi boilers and smart heating systems. Featuring universal PWM control and a anti clockwise rotor, this motor head is compatible with top-tier thermostats including Siemens and Honeywell. With 11 automatic modes, 3 fixed-speed settings, and a night power-saving function, it ensures energy-conscious, responsive heating performance in domestic and renewable applications.

Designed for precision control and long-lasting performance, the BritTherm H3 Series H3 25/6 replacement pump head is a versatile, smart-ready electric motor ideal for replacing worn-out units in combi boilers. It features a anti clockwise rotating rotor and universal PWM (Pulse Width Modulation) control, enabling remote speed regulation via the boiler’s PCB or third-party smart thermostats like Honeywell or Siemens.

The motor head is suitable for integration into advanced heating systems, including solar thermal, underfloor heating, and “smart home” setups. It offers 11 automatic work programmes alongside 3 fixed-speed options (“Old School”), providing flexibility to meet varying heating demands.

Its intelligent night mode reduces energy usage to as little as 5 watts when demand is low—perfect for improving efficiency without compromising performance. Built-in thermal and electrical protection ensures durability even in challenging conditions.

Features & Benefits:
✅ PWM control for remote speed adjustment
✅ Compatible with Honeywell, Siemens, and smart controllers
✅ Anti clockwise rotation for combi boiler systems
✅ 11 automatic programmes plus 3 fixed-speed modes
✅ Ideal for smart homes, underfloor, and solar systems
✅ Night mode cuts energy use to just 5 watts
✅ Built-in PWM processor for seamless integration
✅ Improves system responsiveness and energy efficiency
✅ Thermal and electrical protection for long-term reliability
✅ Simple installation for direct replacement

• Programs = PWM Controlled Motor
• Maximum Head (Meters) = 6
• Flow (m3/h) = 3.2
• Power = 3~45
• Connection Size = 1”
• 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, Grundfos power wire adaptor,Grundfos PWM signal wire adaptor, fastening screws, data sheet and warranty instructions.

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