PHAM NEWS | DECEMBER/JANUARY 2025 22 Energy SavingAwards


Domestic Energy Saving Product of the Year


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Winner: NIBE for the S735 exhaust air heat pump


The NIBE S735 Exhaust Air Heat Pump earned its title for Domestic Energy Saving Product of the Year for its exceptional energy efficiency and innovative integration of heating, hot water and ventilation into a single compact system. Achieving an impressive A+++ energy rating, the S735 boasts a seasonal coefficient of performance (SCOP) of 4.29. Designed for apartments and new builds up to 160m2


, this heat pump also


benefits from advanced smart controls, including the myUplink monitoring platform, which allows for remote troubleshooting and user-friendly temperature management, enhancing overall efficiency. The heat pump employs wireless sensors to monitor CO2, temperature and humidity levels, automatically adjusting ventilation to maintain optimal indoor air quality while reducing energy consumption.


Highly Commended: Mixergy for iHP X integrated heat pump cylinder


The Mixergy iHP X integrated heat pump cylinder features a small output heat pump mounted on top of a hot water cylinder, achieving a Coefficient of Performance (CoP) of about 3. Compared to conventional cylinders, the iHP X can save over 5 tonnes of carbon per unit annually. The iHP X offers low-cost compliance for social housing providers and housebuilders, as it supports SAP and boosts EPC ratings. One of its standout features is the ability to deliver usable


hot water in under 30 minutes through a ‘boost’ function, making it 10 times faster than typical integrated heat pump cylinders. The system is controlled via an app, enabling features like scheduling, machine learning and compatibility with smart tariffs, allowing users to optimise energy use. The iHP X supports solar


PV integration, automatically utilising excess solar energy for water heating, thus reducing grid electricity dependence.


Judge’s comment: “Great combination of hot water cylinder with heat pump.”


Judge’s comment: “This innovative product impresses with its easy installation, energy- saving features and smart design.”


The weather forecast control feature adjusts the system’s operation based on predicted weather conditions, further optimising energy use. NIBE has recently compared


the new S735 with its predecessor, the F730, at two new housing developments in Poole. Measured over February, March and April of 2024, the SCOP of the S735 was consistently 3.9, compared


between 2.9 and 3.4 for the F730. The S735 also utilises low GWP R290 (propane) as a refrigerant, contributing to a lower carbon footprint.


Additional benefits include a compact design that requires no external unit, making it suitable for urban settings where space is limited. Its quiet operation, with a nominal sound power level of 49dB(A), is ideal for noise- sensitive environments.


Commercial Heating Product of the year Winner:


Panasonic for the ECOi-W AQUA-G BLUE heat pump


The outstanding energy- saving feature of the Panasonic ECOi-W AQUA-G BLUE air-to- water reversible heat pump is its variable speed pump combined with scroll compressor technology. This feature allows the system to automatically adjust its operation based on the specific heating or cooling demand, resulting in energy consumption reductions of up to 70% compared to conventional systems. Designed for light commercial, industrial and multi-occupancy residential applications, the ECOi-W AQUA-G BLUE range offers unique capacities available with scroll compressor technology, from 50 to 80kW. With potential capacity of up to 640kW, the system allows connection with up to eight units in cascade, which are fully customisable with various


configuration options. The option of a variable speed pump ensures automatic adjustment of speed according to the required capacity, reducing energy consumption by up to 70%. The unit maximises energy


savings and minimises environmental impact by adopting sustainable solutions without compromising on energy efficiency. With high seasonal performance values, a maximum SEER 4.4 and SCOP


Judge’s comment: “Strong product with clear technical benefits and strengths. Good capacity range plus the ability to connect multiple units.”


3.9, it delivers outstanding performance year-round. These innovative heat pumps use R290, a natural refrigerant with an exceptionally low global warming potential (GWP) 3. This translates to a significantly reduced environmental impact compared to alternative refrigerants. ECOi-W AQUA-G BLUE can


reach up to 70° C leaving water temperature, making the system a sustainable and energy efficient solution for hot water in commercial buildings. With features like EC fans for improved efficiency and compatibility with Panasonic’s Plug & Play Cascade Control, the ECOi-W AQUA-G BLUE is designed for easy installation and operation. Enhanced safety measures for R290 systems further ensure reliable performance.


Highly Commended: Kensa for the


Shoebox NX ground source heat pump


The judges were impressed with how the Shoebox NX works with heat networks to deliver sustainable heating to flats and apartments. With a COP of 4.36 – one of the highest on the market for a small heat pump – and an Energy Rated Performance (ErP) of A+++, the Shoebox NX is incredibly efficient and, therefore, cheap to run. It delivers hot water


up to 64°C and can even be configured to provide passive cooling in the summer months, a valuable feature for combatting overheating, particularly in high-rise buildings. Ground source heat pumps


like the Shoebox NX are inherently sustainable. They emit just 53g/kWh, achieving a 77% reduction in emissions compared to gas.


Judge’s comment: “The coupling with a heat network concept breaks new ground.”


Highly commended: Clivet for the Thunder inverter reversible heat pump


Use of R290 refrigerant, which has a near-zero Global Warming Potential (GWP) of just 3, is a key sustainability feature of Clivet’s Thunder inverter reversible heat pump. With advanced control options like remote management, smart grid integration, and energy metering, the Clivet Thunder range empowers users to maximise energy savings. The units incorporate inverter scroll compressors and high efficiency DC fans with variable speed control. This allows them to precisely match cooling and heating loads, resulting in high efficiency and significant operational cost reductions. They exceed the European Ecodesign directive’s seasonal efficiency requirements by up to 48%. Additional features include capacity modulation from 100% to 30%, ensuring optimal operation across varying conditions. The units operate quietly, offering three acoustic levels to suit different environments. Furthermore, they can connect up to 16 units in a local network, enhancing scalability and efficiency.


Judge’s comment: “Excellent use of ultra-low GWP natural refrigerant R290, showing a strong commitment to maximising environmental benefits.”


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