Why Hybrid Heating Is The Smart Approach To Net Zero

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.

Contact the Rinnai design team today to explore hybrids for your next retrofit project.

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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.

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Read more about Rinnai hybrid systems​​.

Hybrid Solutions

Rinnai offers clear pathways to lower carbon and decarbonisation
Plus customer cost reductions for commercial, domestic
And off-grid heating & hot water delivery and off-grid heating & hot water delivery

• Rinnai’s range of decarbonising products - H1/H2/H3 - consists of hot water heating units in gas/BioLPG/DME, hydrogen ready units, electric instantaneous hot water heaters, electric storage cylinders and buffer vessels, a comprehensive range of heat pumps, solar, hydrogen-ready or natural gas in any configuration of hybrid formats for either residential or commercial applications. Rinnai’s H1/2/3 range of products and systems offer contractors, consultants and end users a range of efficient, robust and affordable low carbon/decarbonising appliances which create practical, economic and technically feasible solutions. 

• Rinnai is a world leading manufacturer of hot water heaters and produces over two million units a year, operating on each of the five continents. The brand has gained an established reputation for producing products that offer high performance, cost efficiency and extended working lives. 

• Rinnai products are UKCA certified, A-rated water efficiency, accessed through multiple fuel options and are available for purchase 24/7, 365 days a year. Any unit can be delivered to any UK site within 24 hours.

• Rinnai offer carbon and cost comparison services that will calculate financial, and carbon savings made when investing in a Rinnai system. Rinnai also provide a system design service that will suggest an appropriate system for the property in question.

• Rinnai offer comprehensive training courses and technical support in all aspects of the water heating industry including detailed CPD’s.

• The Rinnai range covers all forms of fuels and appliances currently available - electric, gas, hydrogen, BioLPG, DME solar thermal, low GWP heat pumps and electric water heaters More information can be found on Rinnai’s website and its “Help Me Choose” webpage. 

Rinnai full product availability 24/7 for next day delivery of all hot water heating unit models including 48-58kW units.

Average savings of:

20% REDUCTION of Opex cost

30% REDUCTION of initial cost

15% REDUCTION in carbon

75%    REDUCTION of space

For more information on the RINNAI product range visit our website.

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