Off-Centre By-Pass Kit – Fixed 25 kPa for 662–665 Manifolds

• Off-centre by-pass kit with fixed setting 25 kPa (2.500 mm w.g.).
• For distribution manifolds 662, 664 and 665 series.
• Max. working pressure: 10 bar.
• Temperature range: -10–110 °C.

Pressure Balance Made Easy: Off-Centre By-Pass Kit (25 kPa Fixed)

Optimize your hydronic system with this Off-Centre By-Pass Kit, pre-set to a precise 25 kPa (2,500 mm w.g.). Engineered to maintain constant pressure differential, this component protects both your circulation pumps and zone valves by ensuring smooth flow even when circuits close.

Compatible with 662, 664, and 665 series distribution manifolds, it’s a critical upgrade for stable and efficient heating systems.

Smart Integration with Trusted Manifolds

Designed for direct use with Caleffi’s 662, 664, and 665 series manifolds, this kit eliminates guesswork by offering a factory-fixed setting—no need for adjustment. Its off-centre design saves space and facilitates flexible installation, even in tight cabinet conditions.

With a working pressure of up to 10 bar and a wide temperature range from -10°C to 110°C, it meets the demands of modern radiant and hydronic systems.

Efficiency, Protection & Peace of Mind

Without a reliable by-pass, pressure build-up can lead to noise, damage, and energy waste. This pre-calibrated kit ensures your heating system remains balanced and efficient—minimizing wear and extending equipment life. Perfect for underfloor heating, multi-zone systems, and modern energy-saving installations.

Built to last. Easy to install. A smart investment in comfort and performance.