Rinnai Corporation is a historic Japanese company with over 95 years of presence and contribution in global technological home heating innovation. With a commitment to deliver the absolute best products, Rinnai heaters are certified by ISO 9001, ISO 14001, ANSI, CSA, HERS, and LEED. The energy factors of Rinnai tankless heaters is up to 0.96, while their heating capacity ranges from 130000 to 200000 BTU/H. Rinnai offers both condensing, and non-condensing units, while their recirculation system named “Circ-Logic” is considered to be one of the most sophisticated and finely-tuned of its kind. All Rinnai tankless heating units come with a 12-year limited warranty.