Halcyan is at Advancing the Efficiency of Buildings 2025. The smarter way to combat limescale and energy waste.
Event: Advancing the Efficiency of Buildings
Dates: 19–20 November 2025
Location: ExCeL London
Stand number: C60
Limescale: The Silent Killer of Efficiency
In every building that has hard water, limescale is quietly reducing energy efficiency. It builds up on heating surfaces, pipework, and plant, forcing systems to work harder and use more energy to achieve the same output. The reality of the issue is eye-opening. Just 1mm of limescale on a heating surface can increase energy usage by up to 10%. Across commercial buildings, estates and public sector portfolios, that means huge sums are being wasted every year, not just money, but energy and carbon too.
Elsewhere in the system, the impact may not increase energy use directly, but it still creates significant issues like restricted flow, blocked valves, damaged fixtures and fittings, and increased maintenance costs. As the UK strives for lower-carbon buildings that can meet future demands, this “invisible insulation” has become one of the most under-appreciated barriers to performance.
Why Current Methods Fall Short
Many engineers are already specifying or maintaining water treatment solutions. Salt-based softeners, chemical dosing systems, or magnetic and electronic devices are all familiar choices in the industry. Yet despite their common use, the fact that limescale persists (clogging, coating, and corroding system efficiency) is proof that these treatments aren’t fit for purpose.
The problem isn’t the intent, it’s the approach.
- Salt-based softeners are only able to reduce the mineral content in water when they are carefully maintained which can be a significant challenge for already stretched facilities teams. Miss a service or forget a refill and the scale quickly starts to build back up.
- Chemical or dosing systems can provide partial benefit, but with the added cost and risk of ongoing consumables, handling and waste to consider.
- Electromagnetic or electronic systems can make a difference in the short term, but often struggle to maintain consistency or lifespan in large and complex systems.
Each of these approaches demand attention, replacement or servicing, That’s adding operational overhead that doesn’t exist with a passive system, in an environment where reliability is everything. Halcyan removes all of those interferences. Once it is installed it simply works, for decades.
Halcyan: a Truly Passive and Permanent Solution
Halcyan Water Conditioners feature a unique alloy core that changes the structure of the minerals in hard water. Instead of binding to surfaces as hard scale, they flow harmlessly through the system, and existing deposits gradually dissolve.
The result is a system that continues to operate as it was designed, year after year.
Halcyan units are:
- Completely passive, with no power, no chemicals and no maintenance
- WRAS-certified and independently proven
- 30+ year lifespan, giving long-term ROI
- Ideal for both retrofit and new build applications
For engineers and building operators, this means performance you can rely on without depending on maintenance cycles, consumables or replacements. Fit-and-forget technology at its purest.
Challenging Assumptions: Time to Rethink ‘Good Enough’
We know many engineers and building managers already have a system in place. But if your system depends on people, products, or processes to keep working, it’s not a truly resilient solution. Performance and efficiency that lasts shouldn’t rely on perfect maintenance conditions or regular interventions. It should be integrated, not just added on.
Halcyan is asking specifiers and engineers to take another look at how they are currently managing limescale. If your solution adds operational burden, requires frequent checks, or is delivering inconsistent results, it’s time to rethink your approach.
True efficiency isn’t just something that happens at commissioning, it is something that needs to endure for the lifetime of the building.
The Hidden Opportunity in Building Performance
Water is the missing link in the energy debate. While we rightly focus on insulation, air quality, and lighting, we tend to overlook the connection between water and energy. Yet with over 60% of the UK covered by hard water regions, the opportunity is huge. By fixing water quality at source, Halcyan helps buildings to achieve:
- Sustained energy efficiency, by avoiding the 7–10% increase in energy consumption that comes from limescale on heating surfaces
- Lower carbon emissions from heating and cooling systems
- Reduced maintenance costs and system downtime
- Extended system life, improving both operational and embodied carbon performance.
In short, Halcyan helps buildings stay as efficient as they were designed to be, permanently.
Trusted by Industry leaders
Halcyan technology is already protecting systems for organisations such as Royal Bank of Scotland, Vodafone, Rio Tinto, Standard Chartered Bank, as well as hospitals, universities and housing associations.
These clients have a common goal: long-term performance, lower operational costs, and genuine sustainability without the added pressure of maintenance.
Visit Halcyan at Advancing the Efficiency of Buildings 2025
At Stand C60, the Halcyan team will be demonstrating how our system can deliver consistent, long-term results across both retrofit and new build projects. Our CEO, Samantha Mant will also be on hand to discuss how Halcyan supports engineers, specifiers and sustainability professionals in the quest to advance whole-building efficiency, and why rethinking water treatment may be the easiest way to start delivering measurable carbon reductions.
If you’ll be at the Advancing the Efficiency of Buildings 2025, come and see why it’s time to make the change from short-term fixes to a permanent water treatment solution that lasts 30 years, not just until the next maintenance cycle.
About Halcyan
Halcyan Water Conditioners are the UK’s most sustainable solution for preventing and removing limescale. Passive, WRAS-certified, and built to last for over 30 years, Halcyan delivers consistent water conditioning with no power, no chemicals, and no maintenance.
Our mission is to combat hard water, protecting systems, saving energy, and helping buildings perform at their best, for people and the planet.
Let’s talk at Stand C60
Visit Stand C60 at Advancing the Efficiency of Buildings 2025 to find out more about how Halcyan can help you:
- Cut carbon and energy waste
- Eliminate limescale permanently
- Simplify system performance for decades to come
Learn more at www.halcyanwater.com