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Massachusetts-Certified Outdoor Hydronic Heaters

Only listed units may legally be sold and installed for use in Massachusetts.

U.S. Environmental Protection Agency (EPA) regulation and certification of new residential outdoor hydronic heaters changed on January 1, 2016.

As a result, only those MassDEP-certified units listed below with an asterisk are currently legal to sell and install in Massachusetts after May 15, 2020. MassDEP certified units listed below without an asterisk and legally installed by Massachusetts homeowners before May 15, 2020, are unaffected and may continue operating.

The MassDEP outdoor hydronic heater regulation at 310 CMR 7.26(50) – including manufacturer compliance certification, stack height, and installation setback requirements – remains in full effect until further notice.

List of MassDEP-Certified Units

Note: Models designated with an asterisk (*) are U.S. EPA Step 2-certified units.

Last Updated in January 2021
Manufacturer Certified Models
Central Boiler Inc.
20502 160th Street
Greenbush, MN 56726
800-248-4681

Classic Edge 350
Classic Edge 360*
Classic Edge 550
Classic Edge 560*
Classic Edge 750
Classic Edge 760*
E-Classic 1450
E-Classic 3250
Maxim M255 P
Maxim M255 PE

Dectra Corp. 
3425 33rd Avenue NE
Minneapolis, MN 55418  
612-781-4236
GARN WHS 1500 (indoor unit for outdoor use)
GARN WHS 2000
Earth Manufacturing LLC 
Box 310
Mountain Grove, MO 65711 
417-926-4136 
Klear Sky 400
Econoburn Boilers
2 Central Avenue
Brocton, NY 14716 
716-792-2094
EBW200-170 (cordwood only)
Greentech Manufacturing Inc. 
2716 Crescent Drive
International Falls, MN 56649 
866-361-735


Crown Royal Stove 7200E*
Crown Royal Stove 7300E*
Crown Royal Stove 7400E*

Hardy Manufacturing Co. Inc. 
12345 Road 505
Philadelphia, MS 39350 
601-656-5866
Klean Burn KB125
Klean Burn KBP165
Klean Burn KBP270 (wood pellets only)
Hawken Energy Inc. 
1064 Industrial Park Drive
Shelby, MI 49455 
888-564-2876
GX10
Heatmor Inc. 
105 Industrial Park Court NE
Warroad, MN 56763 
800-834-7552
200 SSP
200X
350X
Mahoning Outdoor Furnaces 
208 Whiskey Run Road
Mahaffey, PA 15757 
800-692-5200
Skye Series V
Piney Manufacturing Ltd. 
Box 130
Piney, MB R0A 1K0, Canada 
204-423-2367
Portage & Main Enviro Chip 500
Polar Furnace Manufacturing Inc. 
Box 159
Sperling, MB R0G 2M0, Canada 
204-626-3485
G2
G2-Plus
G3
Pro-Fab Industries Inc. 
Box 12
Arborg, MB R0C 0A0, Canada 
888-933-4440
Empyre Elite XT 200
Empyre Pro Series 400
SteelTech / HeatMaster 
445 George Avenue
Box 158
Winkler, MB R6W 4A5, Canada 
204-325-9792

HeatMasterSS G100
HeatMasterSS G200
HeatMasterSS G400
HeatMasterSS G7000*

WoodMaster Inc.
Red Lake Falls, MN 56750
800-932-3629
CleanFire 300*
CleanFire 500*
CleanFire 700*
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