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 April 2022

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* Classic Edge 960* 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 G4000* HeatMasterSS G7000* HeatMasterSS G10000*
WoodMaster Inc. Red Lake Falls, MN 56750 800-932-3629	CleanFire 300* CleanFire 500* CleanFire 700* CleanFire 900* Maxim M255 PE*