10 Best Water Softener 2025 in the UK

The BWT WS555 Hi Flow Luxury Water Softener is a compact and versatile option that fits conveniently in kitchen cupboards, making it ideal for those with limited space. Its 14-litre capacity allows it to handle moderate water softening needs, though it might not be suitable for larger households requiring higher grain capacity. One of the standout features is its compatibility with both salt and tablet forms, providing flexibility in choice and potentially offering better salt efficiency and ease of handling.

Installation is made simple with the included kit, and it operates under sink with an AC/DC power source, accommodating various setups. A generous warranty of 5 years for parts and 2 years for labor provides peace of mind, enhanced by the free home commissioning service. The product is manufactured using BS6920-certified materials, ensuring safety and reliability.

The unit features a high flow rate, which suggests good performance in maintaining water pressure. However, it lacks clarity on the presence of a bypass valve, which is essential for maintenance and uninterrupted water supply during regeneration cycles. The build is robust, weighing 22.5 kg, which might be a consideration for those with limited lifting capability during installation. This product is best suited to individuals or families needing a reliable, space-saving water softening solution.

The Monarch Water Ultimate Midi HE is a WRAS-approved water softener designed for medium-sized households of up to six people. With a robust grain capacity and a daily water treatment ability of up to 2,280 litres at 300 ppm, this unit effectively removes existing limescale and prevents new build-up, offering protection to your appliances and better conditions for your skin and hair. It features a strong water flow rate of up to 78 litres per minute, making it suitable for homes that require a high volume of softened water.

One of its standout features is the Rapid-Fit bypass, which simplifies installation by reducing the number of components needed, making it easier for those not keen on DIY projects. Additionally, it comes with a comprehensive 7-year parts warranty and a 2-year labour warranty, providing peace of mind.

The unit requires a custom installation, which might not be straightforward for everyone, potentially necessitating professional help. Powered by corded electric, it needs a nearby power source, which could limit placement options. The system is also programmable, adding convenience for users wanting to tailor their water usage. This model is targeted at households with a moderate need for softened water and offers a strong balance between efficiency and sustainability. Despite being on the heavier side at 20 kg, its compact dimensions mean it should fit comfortably under most sinks. This water softener is particularly well-suited for those looking to protect their plumbing and enhance water quality without a complicated installation process.