When we talk about making commercial hot water systems more sustainable and energy-efficient, heat pumps are typically front-of-mind. But a question we hear a lot, especially here in the UK with our, let’s face it, often-chilly weather, is: can we get consistent hot water from heat pumps in colder temperatures?
This article aims to clear up some common misconceptions and show just how effective modern heat pump technology can be, even when the mercury drops.
How Heat Pumps Handle Colder Temperatures
At their heart, heat pumps are pretty straightforward. They work by taking heat from one place and moving it to another. For example, air source heat pumps pull heat right out of the air around us, even when it feels quite cold outside. It might sound a bit odd, but even freezing air holds a usable amount of thermal energy that these systems can tap into. And good news, recent advances in heat pump technology have really boosted their performance in colder conditions.
Now, older heat pump models might have struggled a bit, seeing their efficiency dip when temperatures got close to freezing. But today’s ‘cold-climate heat pumps’ are built differently. They’re specifically designed to keep working efficiently even in much lower temperatures. These newer systems often have better components, like advanced compressors and special refrigerants, letting them operate effectively down to -20°C or even -25°C. So, for a typical UK winter, where we rarely hit those extremes, generating hot water from heat pumps in colder temperatures remains a very sensible option for securing low-carbon emission water heating.
UK Climate and Heat Pump Efficiency: What to Expect
The UK’s climate generally features mild to moderate winters, with temperatures usually staying above freezing in many areas. This kind of environment is actually quite good for air source heat pumps to run efficiently. Even during those colder snaps, when temperatures might dip below zero, heat pumps still perform really well. Data and real-world tests consistently show that heat pumps can be two to three times more efficient than traditional gas boilers, even when it’s freezing outside. This efficiency is characterised in terms of their Coefficient of Performance (COP). Basically, how much heat you get out for the electricity you put in.
For businesses needing a steady and reliable supply of hot water, this efficiency directly translates into greater savings in carbon emissions and can help control the costs of all-electric domestic hot water (DHW) systems seen in new commercial building projects. Getting better efficiency in colder weather often comes down to how the system is set up and used. Running heat pumps at a consistent, slightly lower temperature, instead of turning them on and off a lot, helps them stay in their most efficient zone. This ‘slow and steady’ approach has real value when securing consistent hot water from heat pumps in colder temperatures.
Heat Pumps in Commercial Hot Water Systems
More and more, heat pumps are becoming a key part of commercial hot water systems, either on their own or as part of a hybrid setup. For DHW, heat pumps can handle a large proportion, if not all, of a building’s needs. This is especially true if the systems include good thermal storage, which lets the heat pump work more efficiently over longer periods, storing hot water for when it’s needed most.
Adveco, for example, offers various solutions that use heat pump technology for commercial hot water. Their ADV-W and ADVS-W air source heat pumps are made to fit right into different commercial applications, giving you a compact, cost-effective and efficient way to introduce heat into the system. These systems are built to work reliably even in tough conditions, making them excellent for building projects seeking to gain hot water from heat pumps in colder temperatures experienced during UK winters.
Hybrid Systems for Better Performance
While modern heat pumps are very capable on their own, hybrid hot water systems add an extra layer of reliability and efficiency, especially for commercial locations with changing or high hot water demands. A hybrid system can pair a heat pump as a source of system pre-heat with a primary heat source, such as a direct electric boiler or water heater. This setup means the heat pump works throughout the year, offsetting much of the daily energy demand. The primary heat source is used to top up the system to the necessary high working temperatures required by commercial systems, meeting high demand periods and rare periods of exceptional cold weather. This way, you always have an assured provision of hot water.
Adveco’s FUSION packaged electric water heaters, for instance, have been designed to maximise the advantages of integrating a heat pump with a versatile and low-carbon offering. And don’t forget, indirect heating vessels are vital for making heat pump-driven DHW systems work their best. These vessels receive, store and release heated water as demanded. When correctly balanced, the hot water storage aids the heat pump to run more consistently and efficiently, as they work best with lower incoming water temperatures. This optimisation increases the effectiveness of the technology, extracting thermal energy efficiently from the air and then transferring it to create hot water.
The assumption that heat pumps don’t work well in cold weather can, in the UK at least, be effectively rejected. Far more important is making sure that when incorporating heat pumps for DHW as part of a building’s low-carbon strategy, consideration needs to be given to using the technology to its best advantage. Heat that can be generated from ambient air and passed to the cold input, or warm returns, is the best way to maximise an ASHP, and thanks to constant innovation and clever engineering, today’s heat pumps are more than up to the task of providing efficient and dependable hot water, even during our often unpredictable UK winters.
For businesses and organisations looking to cut down on carbon and better manage future running costs, investing in hot water from heat pumps in colder temperature regions of the UK is indeed a smart, forward-thinking, and sustainable move. With good design and proper system integration, such as Adveco offers, commercial heat pump integrations can be a really sensible and eco-friendly way to handle hot water needs all year round.
Explore Adveco’s range of heat pumps: