Riello Boilers

Condensing Boilers designed and manufactured by Riello

Riello Array

Riello Array Condensing Boiler
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. The perfect solution for new installation and retrofits projects.
  • Indoor modular condensing heating units, with horizontally arranged stainless steel exchangers and premixed gas burners
  • Equipped with technical cabinet in aluminum and painted panels, thermal modules of 105 kW or 131 kW and system accessories
  • Compliant with ASME, UL Directive
  • Low polluting emissions

Riello Array SE

Riello Array SE

The Riello Array SE is a condensing pre-mixed, fan-induced modulating floor standing boiler. Array SE boiler has a single heat exchanger inside, providing an high turndown (10:1), with the pumps suplied as standard. A single platform designed for all Array boilers makes installation and commissioning easy, regardless of the output required.

The perfect solution as stand alone installation or bigger power requests, working in cascade.

Riello RTC


RTC is a high water content condensing boiler for installation in heating plants. It is suitable for heating systems and production domestic hot water, in combination with a suitable storage cylinder.

Boiler with three effective flue gas passes. All parts in contact with the combustion products are titanium stabilized stainless steel. Designed based on principle of heat stratification. This allows operation no limits on the return water temperature, maximizing flue gas condensation, for very high efficiency.

The combustion chamber located up high and the tube bundle below, with smooth pipes and removable turbulators. This creates a countercurrent water-flue gas flow, optimizing heat exchange and energy efficiency.

Furthermore, the furnace size is designed to obtain very low polluting emissions values, when combined with Riello BLU flame burners.

Riello RTC-80

Riello RTC 80

High-efficiency 3-pass stainless steel condensing boilers designed both for retrofit and new construction projects. Project costs are reduced thanks to the high water content heat exchanger, that requires no minimum flow rate and eliminates the need of a costly dedicated boiler circulator. Best quality materials used for all components guarantee high reliability and longer service life. Large heat-transfer surfaces, a counter-flow heat exchanger design and cold return water temperatures together optimize condensation opportunities.

The RTC Series Condensing Boilers could be equipped with two-stage or modulating forced draft burners and premix, that achieve extremely low pollutant emissions meeting the most stringent NOx and CO requirements.

Riello Condexa Pro

Riello Condexa Pro Wall Hung Boiler

Riello Condexa PRO is a condensing pre-mixed, fan-induced modulating wall-hung boiler, designed both for stand-alone and cascade applications up to 2.4 ML Btu/hr (702 kW). It is suitable for a wide variety of installations, from office buildings and sports facilities to schools and hotels.

  • Ultra high efficiency AFUE > 95%
  • 10:1 turndown ratio on the single boiler
  • Cascade up to 6 units
  • Integrated managing/depending control (non code differentiation),cascade management included in the interface board control
  • Boiler includes built-in circulating pump
  • 4″ flue exit / air intake adapters supplied as standard – room sealed combustion – NPT connections.
  • Gas category: type A (natural gas) – type E (lpg) according CSA requirements
  • Low emissions
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