27 July 2026
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Advertorial
Rinnai Director Chris Goggin explains why the adoption of hybrid heating and hot water systems is an informed approach towards climate change objectives. Hybrid energy systems utilise two forms of power that can assist in reducing fuels cost and delivering beneficial environmental aims
Hybrid heating and hot water systems are not mentioned by mainstream media as a “first step” solution to commercial decarbonisation. As not all projects currently have the readily available power, space or economics to fully embrace carbon neutral energies, broadly where practical, economical and technically feasibility limitations impact project selection, hybrid systems can fulfil a role as an introductory technology that places customers on a route towards decarbonisation.
Hybrid technology that accepts two separate forms of fuel or power, one would be either natural gas or LPG, alongside solar thermal or a heat pump. Hybrid systems are designed to optimise factors such as outside temperature, current energy prices, property heating and DHW demand whilst making allowances for restrictions.
For many commercial applications particularly in retrofit environments the barriers to full electrification are well understood. Limited power availability, constrained plant space and the need to maintain operational continuity all present challenges. Hybrid solutions work within these constraints, enabling organisations to begin reducing carbon without the need for wholesale infrastructure change.
Rather than relying on one fuel source or technology such as renewable electricity and heat pumps, hybrid options instead use two forms of power or heat generators to complete daily functions inside commercial applications.
For smart DHW hot water systems such as continuous flow water heaters used with heat pumps, the renewable heat generator provides the base load as the water heaters “top up” the temperature. This approach is inherent within the system and ensure optimal performance.
Hybrids offer multiple advantages. The first advantage is from a financial viewpoint: the hybrid approach can by optimising the use of both electricity and gas, hybrid systems can help manage energy costs more effectively, while typically requiring lower upfront investment than a fully electric installation. At the same time, they provide a pathway to future decarbonisation as grid capacity improves and renewable technologies continue to evolve.
Operational resilience is another key benefit. By utilising multiple energy sources, hybrid systems can adapt to changing external conditions, such as fluctuations in temperature or energy pricing, ensuring consistent delivery of heating and hot water. This flexibility is particularly valuable in commercial environments where demand profiles are complex and reliability is critical.
The addition of a combustion-based water heating technology will boost the renewable base load to ensure DHW performance.
Hybrid systems offer a practical route for environmental objectives to be accomplished. As not all customers can fully financially commit to decarbonising practises, an alternative mix of technologies that incorporates both renewable and traditional technologies and fuels is offered to bridge this gap. This practical approach introduces customers to alternative and clean energies whilst maintaining control over energy costs by still relying on conventional and more cost-effective methods of energy usage.
Importantly, hybrid systems should not be viewed as a transitional compromise, but as an enabling technology that supports immediate carbon reduction while maintaining commercial viability. They allow organisations to take meaningful action today, rather than delaying progress until ideal conditions for full electrification are in place.
As the industry continues to navigate the realities of decarbonisation, a pragmatic approach will be essential. Hybrid heating systems provide a scalable, flexible and cost-aware solution that aligns environmental ambition with operational practicality. The path to net zero is unlikely to be delivered through a single technology. Instead, it will require a combination of solutions deployed intelligently and in context. Hybrid systems represent one of the most effective ways to bridge that gap delivering measurable progress now, while keeping the door open for further change in the future.
A hybrid system is comprised of a number of features, components, technologies and fuels. The main elements of a hybrid heating and hot water system are listed below:
- Heat Pump: The renewable backbone of the system. Most hybrid systems utilise air source heat pumps (ASHPs) due to their ease of installation and affordability. Ground source heat pumps (GSHPs) are also viable for specific applications, particularly in commercial settings.
- Condensing Gas Boiler / Water Heater: A high efficiency water heater serves as the auxiliary or backup heat source. Modern condensing water heaters are designed to extract as much heat as possible from combustion gases, increasing energy efficiency.
- Solar Panels: When solar thermal collectors are included, they can contribute heat to the system directly or to a buffer tank. This heat can then be drawn upon before the system calls for either the heat pump, gas boiler and water heaters making it more energy efficient.
- Buffer Tank / Hot Water Cylinder: Optional but recommended for systems that provide domestic hot water (DHW). The buffer tank helps to smooth out demand fluctuations and improve efficiency. Other cylinders can include buffers for minimum water content and for additional hot water demand.
- Sensors and Meters: These measure temperature, flow rates, and energy consumption, feeding data back to the control system to enable automated switching.
Hybrid systems are a smart way in which to introduce lower customer costs and reduced emissions in domestic and commercial applications. Hybrid heating and DHW technology can ideally assist UK customers with navigating current UK energy policy by utilising two forms of power and innovation.
Read more about Rinnai hybrid systems https://www.rinnai-uk.co.uk/about-us/case-studies/hybrid-solutions
