Optimizer 350
Previously certified
EPA lists Optimizer 350 under Piney Manufacturing as a previously certified hydronic heater.
The listed emission rate is 0.3 pounds per million BTU.
The listed HHV efficiency is 65 percent.
Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.
EPA rows
| Field | Row 1 |
|---|---|
| Status | Previously certified |
| Type | Hydronic Heater |
| Subtype | Non-Catalytic Stove |
| Emission | 0.3 pounds per million BTU |
| HHV efficiency | 65 percent |
| Heat output | 400,000 BTU/hr maximum |
| Heat output maximum | 400,000 BTU/hr |
| Firebox | Not listed |
| CO | Not listed |
| Certified fuel | Cord Wood |
| Test method | Not listed |
| 2020 NSPS | No |
| Thermal storage | No |
Retail names in the model line
These are the names split from EPA's model cell. They are aliases for this line, not separate listings.
- Optimizer 350
Other model lines from this manufacturer
- ENVIRO CHIP-500 Previously certified
Nearest model lines by EPA figures
Nearest means the smallest absolute difference on that EPA figure, among other Hydronic Heater model lines that list it. Ties are ordered by model name.
Emission
- KB-125 — 0.3 pounds per million BTU
- Klear Sky 400 — 0.3 pounds per million BTU
- X Series 200X — 0.3 pounds per million BTU
- 350X — 0.31 pounds per million BTU
- Classic Edge 550 — 0.31 pounds per million BTU
HHV efficiency
- BioWIN 152 — 65 percent
- BioWIN 152 — 65 percent
- GARN WHS-1500H — 65 percent
- GARN WHS-1500V — 65 percent
- Woodmaster Mini Boiler — 65 percent
Heat output
- 400-4S — 400,000 BTU/hr maximum
- BIO200 — 94,396–772,085 BTU/hr
- P 100 — 360,000 BTU/hr maximum
- T4-130 — 444,000 BTU/hr maximum
- USV 100GS — 350,367 BTU/hr maximum
Piney Manufacturing hub · EPA Certified Wood Heater Database