Catalytic, non-catalytic, and hybrid wood stoves
EPA lists 38 currently certified catalytic wood-stove rows, 93 non-catalytic wood-stove rows, and 25 hybrid wood-stove rows.
The median emission rate is 1.1 grams per hour for the catalytic rows, 1.7 grams per hour for the non-catalytic rows, and 0.8 grams per hour for the hybrid rows.
The median HHV efficiency is 78 percent for catalytic rows, 71 percent for non-catalytic rows, and 79 percent for hybrid rows.
Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.
| EPA subtype | Rows | Median g/hr | Median HHV % |
|---|---|---|---|
| Catalytic | 38 | 1.1 | 78 |
| Non-catalytic | 93 | 1.7 | 71 |
| Hybrid | 25 | 0.8 | 79 |
These medians are the middle value of the EPA rows in each subtype. They are not a score, and they do not say which subtype a house should use.
Current room-heater rows of every type, including pellet stoves, are 38 catalytic, 200 non-catalytic, and 27 hybrid. The table above keeps pellet rows out so the wood-stove comparison is not mixed with them.