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Optimising hot water with
H
eat pump technology is rapidly emerging as a critical component in the global shift towards sustainable energy, off ering a highly
effi cient method for heating and cooling in buildings. However, the application of heat pumps to meet the rigorous and dynamic Domestic Hot Water (DHW) demands of commercial buildings—such as hotels, hospitals, and large residential blocks—presents a complex design challenge. Simply installing a heat pump is insuffi cient; successful implementation requires optimising the system to strike a perfect balance between outlay costs, operational effi ciency, and long-term environmental impact. Commercial DHW systems are fundamentally
categorised by their approach to heating and storage: Dynamic vs. Storage systems. Understanding this dichotomy is the foundation for eff ective heat pump integration. Dynamic Water Heaters: These systems are
characterised by high heat input and low storage volume. They are engineered for rapid, continuous heating, ensuring the supply never goes cold, making them ideal for high-demand applications where space for storage is severely limited. Storage Water Heaters: Conversely, these
systems utilise a large storage volume with a comparatively small heat input. Their design philosophy is to dump stored hot water to meet demand and then gradually reheat the large volume over an extended period. This approach is highly eff ective for low-energy systems that prioritise high storage capacity to buff er demand spikes. The choice between these two approaches
signifi cantly infl uences the size, cost, and complexity of the heat pump solution.
Key design considerations
When designing a commercial heat pump DHW system, the following factors must be meticulously evaluated: the initial capital investment for the heat pump units storage tanks, and associated electrical/ plumbing infrastructure; the system’s operational effi ciency (COP) which directly determines the long- term utility bills; the carbon emissions associated with the electricity used, which is directly tied to the system’s COP; noise and space requirements are also critical factors in urban environments, where heat pump siting must account for acoustic performance and physical footprint. The most important design decision is whether to utilise the heat pump for
28 March 2026
commercial heat pump systems
Adveco explores the fundamental diff erences in heat pump DHW system design, key selection criteria, and strategies for maximising performance and minimising the carbon footprint
systems. The challenge lies in its fl ammability and associated safety concerns, which necessitate enhanced installation protocols and a highly trained workforce. Future trends indicate a defi nitive transition to hydrocarbons like R290 by the late 2020s/early 2030s as regulations tighten on high- GWP fl uids.
preheating only or for full water heating. The heat pump preheat system is a strategy which employs a low-temperature air source heat pump (ASHP) to raise the water temperature to an intermediate level (e.g., 40°C). The secondary heat source (often a highly effi cient electric after heater) provides the fi nal temperature lift. The advantages of such systems are that although they require larger storage volumes, they allow for smaller, lower-cost heat pumps (e.g., 23kW ASHP). They boast a higher overall system effi ciency (with a COP often around 2.6) because the heat pump operates in its most effi cient temperature range. They are best suited for peaked demand patterns with minimal background use. The disadvantage is that these systems do require more physical space for storage tanks. Heat pump water heating systems utilising a high-temperature ASHP to directly heat the water to the required fi nal temperature (e.g., 60°C) will, however, require a smaller storage volume (e.g., 1,000 litres). They are also suitable for buildings with continuous demand patterns, but, will require larger, more powerful heat pumps (e.g., 90kW ASHP), leading to higher outlay costs. Operating at higher fl ow temperatures results in a slightly lower effi ciency (COP often around 2.5). This comparison highlights a key trade-off between lower outlay costs and higher effi ciency via preheat versus smaller space requirements via high-temperature direct heating. Refrigerant choice is crucial, as it must balance
performance, safety, and environmental impact. R32 is a common contemporary choice due to its medium Global Warming Potential (GWP) and low fl ammability. However, emerging refrigerants, particularly R290
(Propane), are gaining traction for high-temperature heat pumps. R290 off ers superior thermal properties, making it highly suitable for higher fl ow temperature
Designing for maximum effi ciency
System effi ciency (COP) is dynamically infl uenced by the fl ow temperature and the ambient air temperature, often resulting in capacity reduction in cold weather. Strategies to maximise annual effi ciency and
reliability include minimising ASHP Size. Correctly sizing the heat pump reduces initial costs without compromising performance if paired with adequate storage. You can also design for the lowest possible fl ow temperature that still meets the system requirements, as lower temperatures equate to higher COP. Utilising the heat pump for preheating keeps it operating in its most effi cient range, boosting the overall COP during the bulk heat-up cycle. Also critical is the inclusion of redundancy and simple controls to ensure system reliability and prevent operational errors.
Heat pump systems are low-carbon but not zero-
carbon, as their environmental impact is directly linked to the effi ciency (COP) and the grid’s carbon intensity. The Preheat System, with its higher overall COP, often proves to be the most cost-eff ective and environmentally friendly option, maximising the effi ciency of the heat pump while utilising direct electric heating for a small, necessary temperature boost.
Heat pump systems represent a highly sustainable solution for commercial hot water needs. Success hinges on designers optimising the system by carefully balancing size, effi ciency, and cost, recognising that preheat systems with low-energy, high-storage designs are frequently the superior choice. Future advancements in refrigerants, alongside necessary growth in workforce training, will continue to enhance the viability and performance of this critical technology.
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