E4

Previously certified

EPA lists E4 under Wood Boiler USA as a previously certified hydronic heater.

EPA lists 2 rows for this model line, with emission rates of 0 pounds per million BTU and 0.25 pounds per million BTU.

The listed HHV efficiency is 61 percent.

Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.

EPA rows

EPA result rows for this model line
Field	Row 1	Row 2
Status	Previously certified	Previously certified
Type	Hydronic Heater	Hydronic Heater
Subtype	Non-Catalytic Stove	Non-Catalytic Stove
Emission	0 pounds per million BTU	0.25 pounds per million BTU
HHV efficiency	61 percent	61 percent
Heat output	161,455 BTU/hr maximum	161,455 BTU/hr maximum
Heat output maximum	161,455 BTU/hr	161,455 BTU/hr
Firebox	Not listed	Not listed
CO	Not listed	Not listed
Certified fuel	Cord Wood	Cord Wood
Test method	Not listed	Not listed
2020 NSPS	No	No
Thermal storage	No	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.

Other model lines from this manufacturer

Blaze HE Previously certified
Pellet Burner Easy 35 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

Blaze HE — 0 pounds per million BTU
Pellet Burner Easy 35 — 0 pounds per million BTU
Alpha-100 — 0.01 pounds per million BTU
BioWin 260 — 0.01 pounds per million BTU
CP 1700 — 0.01 pounds per million BTU

HHV efficiency

Crown Royal RS7400E — 61 percent
Empire Elite 200/XT200 — 61 percent
KB-125 — 61 percent
USV 100GS — 61 percent
Crown Royal RS7200E — 60 percent

Heat output

G Series G10000 — 41,551–280,451 BTU/hr
G Series G10000 — 41,551–280,451 BTU/hr
Kedel RTB 170 — 162,000 BTU/hr maximum
Classic Edge 550 — 162,170 BTU/hr maximum
GARN WHS-1000H and WHS1000V — 160,000 BTU/hr maximum

Wood Boiler USA hub · EPA Certified Wood Heater Database