G Series G400G400s
Previously certified
EPA lists G Series G400G400s under Steel Tech, Inc. as a previously certified hydronic heater.
The listed emission rate is 0.23 pounds per million BTU.
The listed HHV efficiency is 74 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 | 0.23 pounds per million BTU |
| HHV efficiency | 74 percent |
| Heat output | 350,000 BTU/hr maximum |
| Heat output maximum | 350,000 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.
- G Series G400G400s
Other model lines from this manufacturer
- G Series G100/G100s Previously certified
- G Series G200-2/G200s 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
- Crown Royal RS7400E — 0.24 pounds per million BTU
- GT Series GT-6000 — 0.22 pounds per million BTU
- GARN WHS-1000H and WHS1000V — 0.2 pounds per million BTU
- GARN WHS-1000H, GARN WHS-1000V — 0.2 pounds per million BTU
- Phase 2-200 — 0.26 pounds per million BTU
HHV efficiency
- GARN WHS-2000H — 74 percent
- GARN WHS-2000V — 74 percent
- Vedolux 350 — 74 percent
- Crown Royal Stoves 7300E — 75 percent
- EasyPell — 75 percent
Heat output
- USV 100GS — 350,367 BTU/hr maximum
- P4 Unit 100 — 341,000 BTU/hr maximum
- P 100 — 360,000 BTU/hr maximum
- 400-4S — 400,000 BTU/hr maximum
- Optimizer 350 — 400,000 BTU/hr maximum