Data / ENERGY STAR / Boilers

ENERGY STAR certified boilers: 659 models from 51 brands

The EPA lists 659 ENERGY STAR certified products in boilers from 51 brands, as read on November 4, 2026. The newest certification is Williamson-Thermoflo GWC-140-N-T, dated October 1, 2026, and Weil-McLain has the most certified models with 38. Efficiency (AFUE) runs from 87 to 97 with a median of 95.

SpecStream is the live web data engine for teams and agents. It reads the EPA's ENERGY STAR certified product lists, keyed on the ENERGY STAR Unique ID, and this page is that reading. Ask for the products you track by category, brand or rating, and each new certification arrives in your sheet, CRM, Slack or agent as the EPA publishes it.

• 659Certified products
• 51Brands
• October 1, 2026Newest certification

Newest certified boilers

The 100 most recent certifications of 659. Each row links to the product's record in the EPA's open data portal.

Efficiency ratings across all certified models

Brands with certified boilers

Brands with the most certified models, and the date of their latest certification.

Updated November 4, 2026. Read from ENERGY STAR certified product data, US Environmental Protection Agency (data.energystar.gov). Public domain data from the US EPA and the US Department of Energy. Products are listed as the EPA publishes them on the date this page was read, and the EPA can revise or withdraw a certification. A product is counted once, under the most specific list that holds it. For heat pumps each ENERGY STAR ID is one outdoor and indoor unit combination, so a model number can repeat. Brand names are as published. This page uses EPA data and is not endorsed or certified by the EPA or ENERGY STAR. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.