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Rinnai RCB399AN
Rinnai · RCB399AN
Rinnai RCB399AN appears in the U.S. EPA ENERGY STAR "Certified Commercial Boilers" dataset, which lists products whose manufacturers have certified them to the program's specification (record 3398287, certified 2024-02-07). EPA publishes these rated values for the listing: Full load input rate Btu hr 399; Reported thermal efficiency TE 97.00; Turndown ratio 10.00; Control type Multi-stage; Application Indoor. The listing records ENERGY STAR certification and the rated values the manufacturer reported to EPA. It is not a determination that any building, installation or design complies with a code.
✓ Verified 2026-10-03
Specs on this page were checked against ENERGY STAR Certified Commercial Boilers (data.energystar.gov/d/3393-mxju) on 2026-10-03.
Specifications
| Application | Indoor |
| Control type | Multi-stage |
| Turndown ratio | 10.00 |
| Full load input rate Btu hr | 399 |
| Reported thermal efficiency TE | 97.00 |
Certifications & Standards
ENERGY STAR 3398287 Certified commercial boiler, 2024-02-07
Sustainability
No sustainability metrics on file for this product.