BWT is a global leader in water filtration, with its award-winning tech found around the world in homes, cafés, and hotels. When it comes to coffee and espresso machines, water is a bit of a balancing act. You want to remove harmful minerals that cause limescale damage, but keep (or add) the ones that make your coffee taste bright and clear.

The BWT Best Head Flex Cartridge Head is designed to give you the control you need over your municipal water. It features a unique, adjustable design that fits all BWT water+more filter cartridges, allowing you to swap and change filters if your needs, or water composition, change.

Beyond altering flavour, water which is too 'hard' or too 'soft' leads to espresso machine damage in the long term. Water hardness refers to a high-mineral water composition that may lead to limescale buildup whilst 'soft' refers to a low mineral content that can leach ions from a machine's metal components, resulting in corrosion.

This cartridge head seamlessly bridges your water mains and your water filter cartridge, featuring an automatic shut-off and leak-proof connections. It's built from high-quality, food-safe materials and engineered to minimise pressure loss, ensuring your machine always has the flow it needs. It also includes two integrated check valves to prevent backflow into your mains.

BWT Bestmax filtration cartridges use ion exchange technology to manage calcium and chlorine levels in water. The Besthead Flex Head features a clever, built-in bypass screw, allowing you to blend filtered and unfiltered water. This lets you "dial in" your water hardness, regardless of your local municipal supply. Conveniently, the pipe connections on the Flex are fully adjustable, so it'll fit into awkward, cramped cupboards under the sink.

The BWT Besthead Flex is compatible with all BWT filter cartridges that we sell. Buy a BWT Besthead Flex Cartridge Head to protect your espresso equipment and keep your water tasting great. Cartridges are sold here.

If you are curious about the relationship between water and coffee, check out our blog post on the topic here.

BWT Besthead Flex Cartridge Head features

• 360° adjustable pipe connections
• Anti-twist mechanism keeps supply secure
• Automatic water stop for filter replacement
• FLEX insert socket system allows for over 15 different connector types
• Fits all BWT water+more filter cartridges (and cartridges from other manufacturers)
• Easy bypass screw
• Secure locking mechanism
• Compatible with any plumbable coffee equipment or water systems
• Compact undersink design
• Easy venting, no tools required
• Minimal pressure drop
• Robust engineering endures high-demands
• Easy installation & maintenance
• Two DVGW-compliant backflow preventers
• Suitable for commercial & domestic systems
• Standard wall mount included

BWT Besthead Cartridge Head specifications

• Adjustments: 30° steps (360° total rotation)
• Compatibility: 3/8", 1/2", & 3/4"
• Dimensions: W 100 × D 110 × H 100 mm
• Thread: FLEX Insert (Modular interface)
• Material: High-grade durable polymer
• Weight: ~ 200 grams