Stove Builder International Caddy Alterna II is a non-catalytic forced-air furnace from Stove Builder International with 69% HHV efficiency and a 22,537–64,737 BTU/h output range (previously certified, no longer in production).
Previously certified (out of production). This model appears in the
EPA Certified Wood Heater Database but is no longer on the current certified list,
which usually means it is no longer manufactured. The specifications below are its
certified figures, kept for reference and for owners of installed units. Browse
currently certified heaters for models
sold new today.
General
Appliance type
forced-air-furnace
Combustion technology
Non-Catalytic Stove
Certified fuel
Wood Pellets
Covered model numbers
Caddy Alterna II
Efficiency
Efficiency (HHV)
69 %
Heat output
Heat output (low)
22537 BTU/h
Heat output (high)
64737 BTU/h
Emissions
Carbon monoxide
3.1 g/min
Certification
25C tax credit eligible (≥75% HHV)
No
2020 NSPS compliant
No
Currently in production
No
What space does the Stove Builder International Caddy Alterna II suit?
Is the Stove Builder International Caddy Alterna II EPA certified?
The Stove Builder International Caddy Alterna II holds EPA certification number n/a but is no longer on the current certified list — it is previously certified, which usually means the model is out of production. Already-installed units are unaffected by that status in most jurisdictions.
Does the Stove Builder International Caddy Alterna II qualify for a federal tax credit?
No — the federal 25C credit for biomass stoves was terminated for property placed in service after December 31, 2025. The Stove Builder International Caddy Alterna II's certified efficiency is 69% HHV, which did not meet the credit's ≥75% HHV threshold while it existed. State and local incentive programs may still apply — check your state energy office and air district.
