Riello – Overview
Riello is an Italian manufacturer with over 100 years of experience in burner and boiler technology, and one of the most recognized names in commercial heating systems worldwide. Founded in Legnago, Italy, Riello has grown into a global operation serving residential, commercial, and industrial markets across dozens of countries. In North America, the company operates through Riello America LLC and Riello Canada Inc., with its Canadian headquarters in Mississauga, Ontario serving as the hub for North American sales, technical support, and customer service.
Riello’s product line spans commercial boilers, commercial burners, and process burners, covering gas, oil, and dual-fuel configurations across a wide range of input capacities. Their burner lineup in particular is extensive, running from modulating gas burners designed for tight efficiency control to low NOx configurations built for markets with strict emissions requirements. That breadth means a Riello burner can be matched to an equally wide range of heating equipment, making them a flexible and reliable choice for commercial HVAC and heating applications.
Riello is a Carrier company, which speaks to the level of engineering investment and global backing behind the product. Their North American operation offers factory and on-site technical training, product configurators for specifying engineers, BIM model downloads, and a full documentation library — resources that support the sales and installation process from specification through commissioning.
| Company Name | Riello America LLC |
| Parent Company | Riello S.p.A., a Carrier Company |
| North American HQ | 2165 Meadowpine Boulevard, Mississauga, Ontario L5N 6H6 |
| Toll Free | +1 800-474-3556 |
| Phone | +1 905-542-0303 |
| Fax | +1 855-878-6599 |
| Website | riello.com/north-america |
| Type of Manufacturing | Commercial burners, commercial boilers, process burners |
| Markets Served | Commercial HVAC, institutional, industrial, process heating |
| Product Lines | Modulating gas burners, low NOx burners, dual-fuel burners, fire-tube condensing boilers, wall-hung cascade modules, floor-standing cascade modules |
| Social Media |   |
WHY MERION PUMP AND RIELLO
Burners are not a commodity purchase. The right burner matched to the right heating system makes a meaningful difference in efficiency, emissions, and long-term operating cost. Get it wrong and the consequences show up in service calls, fuel bills, and frustrated building owners. That is why Merion has built a long-standing relationship with Riello and why we reach for their product when a commercial HVAC or heating project calls for a burner we can stand behind.
Riello’s modulating gas burner lineup is particularly well suited to the commercial heating applications Merion serves. Modulating burners adjust their firing rate to match actual building load rather than cycling on and off at full capacity, which translates directly into more consistent comfort, lower fuel consumption, and less wear on the overall system. For building owners and facilities managers focused on operating costs, that efficiency argument is not abstract. It shows up on utility bills.
The depth of the Riello product line also matters in practice. When a project requires a low NOx configuration to meet local emissions requirements, or a dual-fuel setup to maintain heating continuity when gas supply is interrupted, Riello has a product for it. We are not working around the edges of their catalog. We are working from the middle of it, with a manufacturer whose technical support and training resources back up every recommendation we make.
When Merion specifies a Riello burner, we are doing it because the product fits the application and because the relationship between our team and theirs means that if anything needs attention after the sale, it gets attended to.
FEATURED PRODUCTS
Array
The Riello Array is a pre-packaged boiler plant, the new standard in boiler efficiency, redundancy and reliability.
Each Array boiler utilizes multiple heat exchanger modules, providing high turndown (up to 40:1) and multiple boiler redundancy in one packaged unit.
A single platform designed for all Array boilers makes installation and commissioning easy, regardless of the output required.
RS 28 – 50/M Burner
The RS/M series of burners covers a firing range from 198 to 8673 MBtu/hr, and they have been designed for use in hot water boilers or superheaters, hot air or steam generators, diathermic oil boilers.
The Burner models of New RS/M Series have been developed with a new Electrical Panel to Increase flexibility; and despite the integrated layout, various flame safeguards can be used and many useful accessories such as switches, indicator lights, alarm horns etc. etc. can be fitted.
RX 28÷15 S/PV Burner
The Riello RX S/PV range of gas burners, have been designed and developed by Riello with premix combustion technology. They represent the best solutions for low polluting emissions and allow high modulation ratios to be obtained.
In the RX S/PV burners, the perfect mixture of air and gas is created inside the burner suction line circuit. The air/gas mixture is distributed in the combustion head or “support”. It consists of a metal cylinder with dedicated surface holes for mixture outlet.