IN FOCUS ARDENT & FUSION: A Balanced Approach To Electric Water Heating C


ommercial new build stipulates the use of electric heating for the provision of domestic hot water (DHW), and specifications will typically seek to deploy heat pumps to supply the building’s space and water heating. However,


commercial systems should be approached separately as hot water requires consistent, year-round storage at or above 60°C for daily supply, plus they must be able to meet unexpected or extended peak demands, as well as regular high temperature flushing to prevent any Legionella bacterial growth. This has consequently driven developments in high-temperature heat pumps, said to be capable of achieving temperatures of up to 70°C under optimal conditions. These appliances, using CO² or R290 (propane) as a refrigerant, are typically large, heavy and therefore expensive to purchase and install. There also remain unresolved concerns over the use of larger quantities of flammable refrigerant, especially when installed in proximity to other electrical devices, which have the potential to become a source of ignition should there ever be a leak. After much consideration, Adveco believes a hybrid approach, which still leverages


heat pumps, but to supply DHW system preheat only, is the optimal method for the delivery of water heating. This maximises the effective capability of heat pump technology designed to work at lower temperatures (sub 55°C), meaning smaller, lower-cost units operating with safer R32 refrigerant can be used to offset primary electrical heating costs as well as providing highly effective carbon reduction. Adveco has developed the ADV-W range of heat pumps, offering single and three-phase units with heating capacities from 9 to 110 kW, making them suitable for the majority of commercial DHW applications. To then gain the necessary higher system temperatures, Adveco recommends the


use of a commercial electric boiler deployed in indirect configuration with a cylinder for storage. Adveco ARDENT is a range of compact wall-hung or floor-standing electric boilers with heat outputs from 9 to 100 kW. Easy-to-integrate, high-capacity, reliable, they provide a compact response to the needs for primary top-up of electric hot water and central heating demands in commercial buildings. With multiple electric heating elements immersed in ARDENT’s integrated water storage tank, the boiler


provides a rapid and reliable source of thermal energy with stepped power control and integrated overheat protection, reducing start-up current and economically adjusting the heating load when approaching the set point temperature. Using pre-heated stored water, the ARDENT boiler operating at a relatively low temperature (80°C) quickly brings the system water up desired working temperatures. But without the heating intensity on surfaces typically seen in direct immersion-based systems, destructive limescale build-up in hard water areas can be very effectively reduced. With ARDENT used in a sealed ‘primary loop’ configuration, little to no scale build is seen as the boiler recirculates the same finite amount of water through the heat exchanger, maintaining efficient operation and improved response time over an extended lifespan due to the increased reliability. Adveco’s award-winning FUSION electric water heating system brings all this functionality and advantage together in a single, pre-sized system which mounts ARDENT to the cylinder and is packaged with


controls and pre-built pipework for up to 750 litre capacities and up to 52 kW nominal heating output with the addition of an optional air source heat pump. An immersion can also be added, providing extra redundancy to what is already built into the ARDENT boiler, ensuring no single point of failure for business-critical applications. The hybrid approach to electric water heating, encapsulated by the new FUSION TW system with ASHP,


more than meets the sustainability demands of new buildings, delivering up to a 48% reduction in carbon emissions compared to equivalent direct electric systems. But it can also be applied to existing properties seeking to upgrade and transition away from gas water heating. In this scenario, carbon emissions of up to 68% are possible. Electric water heating does still come at a price, both in terms of new appliances and higher operational costs, despite the use of heat pumps. Offsetting as much of the energy demand for primary heating is therefore incredibly valuable, and properly


sized and installed hybrid systems such as FUSION can gain as much as 70% of system heat for the heat pump. And if you size correctly, the need for large, costly high-temperature heat pumps can be avoided. For commercial operations with basin and sink-led demands, typified by schools, cafes & restaurants, retailers and offices, the cost of implementing a DHW system can be cut by as much as 90% by adopting the hybrid approach, which makes sustainability strategies not only attractive, but feasible.


www.adveco.co Airtech Helps Landlords Comply with Awaab’s Law


Awaab's Law. With our help and expertise, alongside a range of products and services to overcome the challenge of condensation and mould, landlords can be sure that they are on track to meet the October deadline”, said Katie Mairs, Channel Marketing Manager at Airtech. “Everybody deserves a safe and healthy home, free from condensation and mould. We can help landlords tackle the issue head- on and ensure they meet their duty of care and comply with the law.” Boasting patented market-leading


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ondensation and mould specialists, Airtech, are offering help to social housing landlords ahead of Awaab’s Law coming into effect on 27 October 2025. The new law was laid out in front of Parliament on 25 June, along with Awaab’s Law: Draft guidance for social landlords. So, Airtech


is helping landlords tick all the right boxes to comply with Awaab’s Law with its surveys, advice and treatment to tackle condensation and mould, along with a full ventilation installation service. To comply with Awaab’s Law, landlords must ensure their tenants are protected from hazards, such


as damp and mould, and that any issues are investigated and dealt with promptly. Airtech can offer solutions and advice to landlords who need help tackling condensation and mould, and help them meet the October deadline to comply with the new legislation and protect their residents. Airtech offers comprehensive property surveys to identify condensation, damp and mould problems.


The company can then provide advice and recommendations on how to solve the issues; mould removal treatment and redecoration, and a full ventilation installation service for both responsive and planned maintenance. The treatment and mould removal are backed by a unique three-year guarantee that the mould will not return. Plus, its datalogging service helps support landlords as they need to keep good records to help comply with Awaab's Law. “Airtech ticks all the right boxes when it comes to supporting landlords so that they comply with


ventilation technology that improves resident comfort and efficiency, Airtech can offer landlords the correct solution for individual properties. This includes the Air+ Loft Positive Input Ventilation (PIV) and Air+ Wall PIV units which push out stale, humid air and replace it with filtered and warmed air from outside. This has the added benefit of helping keep any warmth in the home rather than extracting it to the outside, plus the units are supplied with an energy efficient preheater to take the chill off fresh incoming air. In addition, both the Air+ Loft PIV and Air+ Wall PIV are made from recycled plastic helping social housing landlords meet their environmental targets. Other options include environment sensing bathroom and kitchen fans, such as the SensaFan range including, the SA25 SELV, the SA60 SELV and the SA64. Furthermore, Airtech’s unique control and datalogging ventilation products, the DataFan range, including the DA25, DA60 and DA64, which record details of a home’s environment, such as humidity and temperature levels, to allow the landlord or contractor to track and analyse the correlation of these variables together on one graph. This will allow a landlord to clearly track the effects changing lifestyle habits have on a home environment. It will also demonstrate how reducing relative humidity through adequate heating and ventilation can maintain a healthy home. Airtech’s sophisticated datalogging allows landlords to interrogate saved IAQ data, thus giving peace of mind. Hand-in-hand with the datalogging, Airtech’s specialist control platform monitors the data as it is


collected and modulates the fan accordingly to react automatically and proportionally to rising humidity levels, offering quick and effective humidity control. This ensures the resident keeps the optimum environment in the home to avoid condensation forming, thus helping maintain good IAQ. For more information and to find out how Airtech can help finding the right ventilation solution call 01823 690 292 email info@airtechsolutions.co.uk or visit our website.


www.airtechsolutions.co.uk. Read the latest at: www.bsee.co.uk BUILDING SERVICES & ENVIRONMENTAL ENGINEER OCTOBER 2025 39


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