Current DOE CCMS record

Green Mountain GMGS299E Boiler Specifications

Source facts reported to DOE for this exact model identifier.

Key specifications

DOE-reported brand
Green Mountain
Exact model number
GMGS299E
Boiler class
Gas-fired steam boiler
Input capacity
299,000 BTU/h
AFUE
82%
Standby power
8 W
Off-mode power
8 W

DOE source details

DOE basic model number(s)
GMGS299E

Source & freshness

DOE CCMS source page

Source snapshot retrieved: September 20, 2026

These records were reported to DOE. Appearance here is not a DOE compliance determination, independent test, or approval.