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Home / Products / Div 23 52 00 — 23 52 00 / U.S. Boiler Company CTD500C
U.S. Boiler CompanyDiv 23 · HVACNo manufacturer photo on file
Div 23 52 00 · 23 52 00

U.S. Boiler Company CTD500C

U.S. Boiler Company · CTD500C

U.S. Boiler Company CTD500C 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 4682279, certified 2026-08-04). EPA publishes these rated values for the listing: Full load input rate Btu hr 500; 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

ApplicationIndoor
Control typeMulti-stage
Turndown ratio10.00
Full load input rate Btu hr500
Reported thermal efficiency TE97.00

Certifications & Standards

ENERGY STAR 4682279 Certified commercial boiler, 2026-08-04

Sustainability

No sustainability metrics on file for this product.

Code sections

Sections of the model codes that address this type of product. A link opens the code library at the chapter that holds the section. It points to the code; it does not say this model meets it.

  • IECC 2021 R403.7Equipment sizing and efficiency rating

    IECC 2021 R403.7 governs sizing and the minimum efficiency rating of residential heating and cooling equipment. This is the section for this product type, not a check of this model against it.

    What this link does and does not claim

    Asserted: this is an ENERGY STAR certified commercial boiler, and R403.7 is the energy code section that addresses sizing and the minimum efficiency rating of residential heating and cooling equipment. Not asserted: that this model meets any table value in R403.7, or that any building using it complies.

  • IECC 2021 C403.3.2HVAC equipment performance requirements

    IECC 2021 C403.3.2 governs the minimum efficiency of commercial HVAC equipment (Tables C403.3.2(1) through C403.3.2(16)). This is the section for this product type, not a check of this model against it.

    What this link does and does not claim

    Asserted: this is an ENERGY STAR certified commercial boiler, and C403.3.2 is the energy code section that addresses the minimum efficiency of commercial HVAC equipment (Tables C403.3.2(1) through C403.3.2(16)). Not asserted: that this model meets any table value in C403.3.2, or that any building using it complies.