The perfect combination of reliability, technology and performance in one compact unit, the Rinnai I-Series condensing boiler can serve heating needs or can be combined into a dual-purpose heating and water-heating unit, the company notes. www.rinnai.us
Rinnai condensing boiler
![Rinnai condensing boiler](http://www.pmengineer.com/ext/resources/Issues/2021/03-March/New-Products/pme0321_Products_Rinnai-slide5.jpg?1615888581)