400-4S
Previously certified
EPA lists 400-4S under Heatmor Manufacturing as a previously certified hydronic heater.
The listed emission rate is 0.28 pounds per million BTU.
The listed HHV efficiency is 76 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 | 0.28 pounds per million BTU |
| HHV efficiency | 76 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.
- 400-4S
Other model lines from this manufacturer
- 200 SSP Previously certified
- 350X Previously certified
- X Series 200X 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 RS7300E — 0.29 pounds per million BTU
- KB-125 — 0.3 pounds per million BTU
- Klear Sky 400 — 0.3 pounds per million BTU
- Optimizer 350 — 0.3 pounds per million BTU
- X Series 200X — 0.3 pounds per million BTU
HHV efficiency
- Crown Royal Stoves 7200E — 77 percent
- Crown Royal Stoves 7300E — 75 percent
- EasyPell — 75 percent
- EasyPell 16-20KW — 75 percent
- G Class G3 — 77 percent
Heat output
- Optimizer 350 — 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
Heatmor Manufacturing hub · EPA Certified Wood Heater Database