Radiator sustainability is shaping modern heating, says Philip Conroy, national sales and key account manager at Zehnder Group UK, as manufacturers and installers rethink materials, packaging and low-carbon performance to meet tighter regulations and evolving customer demands.
Sustainability has moved well beyond being a trend in heating – it’s now a necessity. For some in the industry it’s a personal mission, while for others it’s about meeting legislation, cutting energy waste, and managing costs. Whatever the motivation, sustainability is now firmly embedded in how heating systems are designed, installed and used. For plumbing and heating professionals, the question is: how do radiators contribute to this shift?
A common misconception made about radiator efficiency is that all radiators are 100% efficient in converting energy into heat. Actually, it is their effectiveness (rather than efficiency) in extracting heat from the heating system and delivering it into the space that varies. Some radiators provide higher heat output per unit size, but this should not be confused with greater energy efficiency. What really matters for sustainability is how radiators perform in different heating scenarios – not simply whether they hold onto heat.
As UK Building Regulations, such as Approved Document Part L, push the adoption of low-temperature systems, the ability of radiators to optimally perform under these conditions is critical. Another common misconception is that radiators are poorly suited to low-temperature systems such as air source heat pumps. But most modern radiators are well-matched and can even offer greater comfort and faster responsiveness compared with alternatives such as underfloor heating.
The choice of material also plays a role. Aluminium radiators heat up and cool down quickly, which is useful where occupancy patterns change frequently. By contrast, steel radiators provide thermal inertia, helping maintain a steady thermal output. The amount of radiant heat given from a radiator (in comparison to the amount of convected heat) will influence both the reaction times of the heating system and room as well as potentially achieving comparable comfort levels with air temperatures 1-2 degrees lower.
Manufacturing with sustainability in mind
For installers and specifiers, it’s important to remember that sustainability doesn’t just begin when the radiator is fitted – it starts with manufacturing and continues through the entire product lifecycle. Progressive manufacturers, like Zehnder, are reducing their carbon footprint in many ways, from switching to renewable energy sources in production and rethinking processes that make a measurable difference.
For instance, the Zehnder Charleston multicolumn radiator is manufactured using laser welding instead of conventional electro-resistance welding. This approach not only lowers energy use, but also cuts water consumption and eliminates the need for installers to spend additional time flushing out waste created by more traditional welds – delivering a cleaner, more efficient and ultimately more sustainable outcome.
Materials are another factor. Steel and aluminium radiators typically contain a high proportion of recycled content, and they can all be recycled again at end of life. Products designed to last longer also mean fewer replacements, saving resources over the long term, further strengthening sustainability credentials.
Packaging, waste and the bigger picture
Beyond manufacturing, installers are becoming increasingly aware of packaging waste, and so are customers. With plastic taxes and disposal costs climbing, many manufacturers are moving to recyclable or recycled packaging – and in some cases eliminating plastic altogether. Sustainable packaging is not just an environmental responsibility; it makes financial sense for businesses throughout the supply chain. Therefore, installers should look for manufacturers committed to reducing packaging waste and using recyclable materials.
For those looking to dig deeper into environmental impact, tools such as CIBSE TM65, Product Environmental Passports (PEPs), Environmental Product Declarations (EPDs) and Life Cycle Assessments (LCAs) are available. These frameworks help assess sustainability credentials, though direct comparisons can be tricky. Reputable brands will always be open with their data and certification – don’t be afraid to ask for them!
Why it matters
The takeaway is clear: quality, durability, and long-term value are key markers for choosing the right radiator for the job, but top sustainability credentials and compliance is the icing on the cake. Customers increasingly expect sustainable solutions, and by choosing the right products, installers can provide systems that perform better, last longer, and keep running costs down.
Looking ahead, sustainability will define heating and plumbing for years to come. For those who choose to embrace it now by understanding how radiators fit into low-carbon heating systems and by choosing responsibly manufactured products will be better placed to meet both today’s regulations and tomorrow’s customer expectations.
