Why Specify the RHC+: Discover the Reznor Difference in High-Efficiency Heat Modules 

When you are specifying heating for a ducted system, it is not just about hitting an output figure. The right heat module needs to deliver reliable performance, fit the available space, work with the wider system, and make sense from an installation and running-cost point of view. 

That is why heat modules are used across such a wide range of sectors. In commercial and industrial buildings, they are fitted into ductwork and air handling systems to provide dependable, controllable heat. In manufacturing environments, they can also support process-led applications such as drying, curing, and other temperature-controlled operations where consistency matters. 

For projects like these, the RHC+ offers a strong case. It is Reznor’s latest generation gas fired heat module, designed to combine high efficiency, ultra-low NOₓ emissions, and flexible installation in one practical solution. 

What specifiers really need from a heat module 

A good heat module should do more than heat the air. 

It should be efficient enough to help control energy use, flexible enough to suit the layout of the system, and straightforward enough to install without creating unnecessary complications on site. It also needs to suit the reality of modern projects, where many upgrades involve working around existing air handling units, ductwork, and limited space. 

This is where the RHC+ stands out. It has been designed with real-world specification challenges in mind, particularly where there is a need to upgrade or replace existing equipment without overcomplicating the job. 

A practical choice for retrofit and replacement projects 

One of the biggest strengths of the RHC+ is how well it suits replacement work. 

It is ideal for replacing LPHW or electrical coils with gas and can be retrofitted into a wide variety of applications. That is a major advantage on refurbishment projects, where the goal is often to improve performance without redesigning the whole system around the heater. 

Its modular design makes that easier. The RHC+ can be built to suit the application and is designed to integrate into ductwork systems and air handling units without forcing a one-size-fits-all approach. For specifiers, that means more flexibility. For installers, it means fewer compromises on site. 

RHC+ WMI EXT – Condensing External Heat Module

High efficiency that supports better system performance 

Efficiency is always a key part of the specification decision, and the RHC+ has been designed to perform well here. 

With net efficiencies of up to 109% on condensing models, it is built to help reduce fuel wastage while maintaining strong heating performance. That is especially important in buildings and processes where heating demand is high and running costs need to be kept under control. 

It is also available in condensing and non-condensing formats, which gives more scope to match the unit to the application rather than forcing the application to fit the product. 

Alongside this, the RHC+ delivers ultra-low NOₓ emissions of less than 30 mg/kWh, helping support projects where environmental performance is part of the brief. 

Designed to fit the system, not fight against it 

Space, layout, and installation constraints are often what make or break a specification. 

The RHC+ has been developed to give specifiers more options here. It is available in a range of formats, including slimline, room sealed slimline, condensing, and condensing external heat modules. Depending on the application, units can be installed vertically, horizontally, or stacked. Where higher outputs are needed, modules can also be mounted in series or side by side. 

That flexibility makes the range suitable for a broad mix of industrial and commercial projects, particularly where air handling units or ducted systems need a heat source that can adapt to the job rather than the other way round. 

Performance backed by solid engineering 

A heat module still needs the right build quality behind it, and this is another area where the RHC+ makes its case. 

It uses a drum and tube, four-pass, stainless steel 304 heat exchanger with sealed combustion. In simple terms, that means robust construction, efficient heat transfer, and a design suited to demanding environments. 

The RHC+ is factory assembled on a frame and designed for straightforward mounting, which helps simplify installation. Controls are also positioned on a single side for easier access, which is a practical benefit both during installation and later servicing. 

Suitable for internal and external applications, it is designed to support straightforward integration into AHU and ducted systems while keeping the overall package compact and usable. 

RHC+ WMIV – Slimline Heat Module

Why the Reznor difference matters 

Specifying the right product is about more than just product features. It is also about confidence in the manufacturer behind it. 

With the RHC+, that means the backing of Reznor, a long-established name in industrial and commercial HVAC. The range is made in Britain and developed around the kind of practical challenges specifiers, contractors, and building operators deal with every day. 

That comes through in the details: 

• High efficiency performance 

• Ultra-low NOₓ emissions 

• Flexible modular design 

• Easier retrofit potential 

• Options for internal or external installation 

• A range that can be tailored to suit the application 

Taken together, those points are what make the RHC+ more than just another heat module. It is a solution built to work in real projects, where installation time, layout constraints, performance expectations, and long-term value all matter.

A smarter specification for demanding applications 

For industrial and commercial heating projects, the best specifications are the ones that balance performance with practicality. 

The RHC+ does exactly that. It gives specifiers a gas fired heat module that is efficient, adaptable, and suited to both new and replacement applications. It supports a wide range of system configurations, helps reduce emissions, and brings the kind of installation flexibility that makes a real difference once a project moves from drawing to site. 

If you are looking for a heat module that can deliver strong performance without creating unnecessary complexity, the RHC+ is well worth specifying. 

Explore the RHC+ range, visit Reznor, or contact the team to discuss your application.