{"product_id":"hearthstone-stoves-green-mountain-insert-70-wood-fireplace-insert","title":"Hearthstone Stoves Green Mountain Insert 70 Wood Fireplace Insert","description":"\u003ch2\u003eSteady Soapstone-Lined Wood Heat for Your Masonry Fireplace\u003c\/h2\u003e\n\u003cp\u003eThe Green Mountain Insert 70 (GMi70, Model 8450) is a non-catalytic wood fireplace insert with a flush cast iron design, soapstone-lined firebox, and factory-installed blower, in two finishes.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlush cast iron design\u003c\/strong\u003e — the insert installs flush with the fireplace facing for a clean, built-in look, with an arched cast iron front in Black Matte or Brown Enamel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoapstone-lined firebox\u003c\/strong\u003e — a 2.4 cu. ft. firebox lined with natural soapstone accepts logs up to 20 inches and radiates steady warmth as the fire burns down.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-catalytic combustion\u003c\/strong\u003e — a single-lever primary air control adjusts the burn rate; there is no catalyst to monitor or replace.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEPA 2020 certified using cordwood\u003c\/strong\u003e — certified at 2.3 g\/hr particulate emissions with a 72% (HHV) weighted average efficiency, per the current owner's manual.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum cordwood heat output of 44,500 BTU\/hr\u003c\/strong\u003e — with heating coverage of up to 2,000 square feet, depending on home layout, insulation, and operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded convection blower\u003c\/strong\u003e — the unit ships complete with a factory-installed blower with automatic heat-sensor operation and a manual mode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeatLife up to 8+ hours\u003c\/strong\u003e — per the current owner's manual, soapstone extends usable heat well after the active flames decline.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003ch4\u003eFlush Cast Iron Design\u003c\/h4\u003e\n\u003cp\u003eThe GMi70 is designed to sit flush with the fireplace facing, framing the fire with an arched European cast iron front. An optional steel surround system trims the transition to the masonry opening, and the surround coverage measures approximately 45-3\/8 inches wide by 31-5\/8 inches tall per current HearthStone materials.\u003c\/p\u003e\n\u003ch4\u003eSoapstone-Lined Firebox\u003c\/h4\u003e\n\u003cp\u003eThe firebox is lined with natural soapstone panels over a steel firebox body. Soapstone absorbs heat during the burn and releases it gradually, moderating temperature swings and extending comfortable warmth. The overall firebox volume is 2.4 cu. ft., with an EPA loading volume of 1.95 cu. ft. and a maximum log length of up to 20 inches.\u003c\/p\u003e\n\u003ch4\u003eNon-Catalytic Combustion\u003c\/h4\u003e\n\u003cp\u003eA single primary air control lever under the ash lip regulates the burn rate from high to low. Secondary combustion air burns gases released by the wood, and an air-wash system helps keep the ceramic glass clear for viewing the fire. The glass is a clear ceramic material capable of operating at temperatures up to 2300°F.\u003c\/p\u003e\n\u003ch4\u003eIncluded Convection Blower\u003c\/h4\u003e\n\u003cp\u003eA blower is factory installed beneath the insert, behind the front casting. In the automatic position, a heat sensor starts the blower when the insert is hot and stops it as the insert cools; a manual position runs the blower at any time. The current dealer sheet confirms the unit ships complete with the blower.\u003c\/p\u003e\n\u003ch4\u003eFlexible Surround and Fireplace Fit\u003c\/h4\u003e\n\u003cp\u003eAn optional steel surround attaches behind the cast iron faceplate, an optional lower surround panel completes a four-sided surround for raised-hearth installations, and an optional surround extension allows the insert to project 2 or 4 inches into the room, reducing the required fireplace depth. These options let the GMi70 fit a range of masonry fireplace geometries; see the accessory table below.\u003c\/p\u003e\n\u003ch4\u003eFull-Length 6-Inch Liner Requirement\u003c\/h4\u003e\n\u003cp\u003eThe GMi70 must be installed with a continuous 6-inch listed stainless steel chimney liner extending from the insert to the top of the chimney, using liners listed to UL 1777, ULC S635, or CAN\/ULC S640. The manual describes three connection methods, including the recommended optional Liner Hook-Up Starter Collar, and recommends a sheet metal block-off plate to reduce cold-air backdrafts.\u003c\/p\u003e\n\u003ch3\u003eAvailable Finishes and Configurations\u003c\/h3\u003e\n\u003cp\u003eThe GMi70 is a single base model available in two finishes. Pricing varies by finish.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003cth\u003ePart ID\u003c\/th\u003e\n\u003cth\u003eMSRP\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlack Matte\u003c\/td\u003e\n\u003ctd\u003e8450-0010\u003c\/td\u003e\n\u003ctd\u003e$4,599\u003c\/td\u003e\n\u003ctd\u003eShips complete with the factory-installed blower.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrown Enamel\u003c\/td\u003e\n\u003ctd\u003e8450-0020\u003c\/td\u003e\n\u003ctd\u003e$5,099\u003c\/td\u003e\n\u003ctd\u003eShips complete with the factory-installed blower.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eGreen Mountain Insert 70 (GMi70), Model 8450\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppliance type\u003c\/td\u003e\n\u003ctd\u003eWood fireplace insert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustion system\u003c\/td\u003e\n\u003ctd\u003eNon-catalytic, single-lever primary air control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHHV efficiency\u003c\/td\u003e\n\u003ctd\u003e72% weighted average, per current owner's manual and EPA technical data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPA particulate emissions\u003c\/td\u003e\n\u003ctd\u003e2.3 g\/hr, certified using cordwood, per current owner's manual and EPA certification data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum cordwood heat output\u003c\/td\u003e\n\u003ctd\u003e44,500 BTU\/hr, per current owner's manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPA tested output\u003c\/td\u003e\n\u003ctd\u003e14,200–44,500 BTU\/hr under specific test conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeating area\u003c\/td\u003e\n\u003ctd\u003eUp to 2,000 sq. ft., depending on home and installation conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall firebox volume\u003c\/td\u003e\n\u003ctd\u003e2.4 cu. ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPA loading volume\u003c\/td\u003e\n\u003ctd\u003e1.95 cu. ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum log length\u003c\/td\u003e\n\u003ctd\u003eUp to 20\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeatLife\u003c\/td\u003e\n\u003ctd\u003eUp to 8+ hours, per current owner's manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e33-1\/2\" W × 19-5\/8\" D × 25-3\/4\" H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e513 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlue outlet\u003c\/td\u003e\n\u003ctd\u003e6\" diameter, top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVenting\u003c\/td\u003e\n\u003ctd\u003eContinuous listed 6\" stainless steel chimney liner to the top of the chimney\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMasonry chimney flue\u003c\/td\u003e\n\u003ctd\u003e6\" round, or 8\" × 8\" square\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlower\u003c\/td\u003e\n\u003ctd\u003eIncluded, factory installed, automatic and manual modes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel\u003c\/td\u003e\n\u003ctd\u003eDry, seasoned natural cordwood only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish options\u003c\/td\u003e\n\u003ctd\u003eBlack Matte or Brown Enamel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eLined masonry fireplace and masonry chimney only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFireplace Opening, Clearances and Hearth Requirements\u003c\/h3\u003e\n\u003cp\u003eThe GMi70 and its stainless steel chimney liner are approved for installation only within a lined masonry chimney and masonry fireplace conforming to building codes for solid fuel. Do not remove bricks or mortar from the existing fireplace, do not connect to a chimney flue serving another appliance, and note that a positive flue connection to the clay tile is not approved. The GMi70 is not intended for installation in a bedroom.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMinimum Masonry Fireplace Opening\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e28-7\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e23-5\/16\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth, standard installation\u003c\/td\u003e\n\u003ctd\u003e19-5\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth, with 2\" surround extension\u003c\/td\u003e\n\u003ctd\u003e17-5\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth, with 4\" surround extension\u003c\/td\u003e\n\u003ctd\u003e15-5\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eWhere a fresh air intake is needed, HearthStone suggests adding a minimum of 4 inches to the width of the minimum masonry opening. The optional surround extension permits the shallower 17-5\/8\" or 15-5\/8\" installation depths by projecting the insert 2 or 4 inches into the room when installed according to the current manual.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eClearance\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjacent combustible side wall\u003c\/td\u003e\n\u003ctd\u003e16\" from the insert body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible side surround or trim\u003c\/td\u003e\n\u003ctd\u003e9\" from the insert body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible top surround\u003c\/td\u003e\n\u003ctd\u003e27\" above the insert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible mantel shelf\u003c\/td\u003e\n\u003ctd\u003e50\" from the bottom of the insert per current HearthStone materials; the manual states the corresponding minimum of 27\" above the insert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum mantel shelf depth\u003c\/td\u003e\n\u003ctd\u003e12\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum combustible side surround thickness\u003c\/td\u003e\n\u003ctd\u003e5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCeiling\u003c\/td\u003e\n\u003ctd\u003e84\" above the hearth floor protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eHearth and floor protection requirements depend on the height of the masonry hearth. If the hearth is at least 5 inches above the combustible floor, noncombustible floor protection with no specified R-value must extend at least 16 inches (USA) or 18 inches (Canada) in front of the insert. If the hearth elevation is less than 5 inches, the floor protector must have an R-value of at least 1.00 and extend at least 23 inches in front of the unit. In the USA, front and side protection is measured from the door opening; in Canada, the 8-inch side protection is measured from the side of the insert.\u003c\/p\u003e\n\u003cp\u003eThe standard installation leaves no projection of the convection air jacket in front of the fireplace opening; using the surround extension, the insert may project 2 or 4 inches into the room, and any additional floor protection is determined using the manual's calculation based on the existing hearth extension and the projection used. Note that some luxury vinyl plank and tile flooring may begin to warp around 110°F, so additional shielding may be necessary depending on the flooring manufacturer's limits. The current owner's manual governs every installation; review it with your installer and local building official for complete requirements.\u003c\/p\u003e\n\u003ch3\u003eIncluded Equipment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGreen Mountain Insert 70 Model 8450 wood fireplace insert\u003c\/li\u003e\n\u003cli\u003eFactory-installed convection blower (the unit ships complete with the blower)\u003c\/li\u003e\n\u003cli\u003eTwo boxes of soapstone firebox lining\u003c\/li\u003e\n\u003cli\u003eOwner's manual\u003c\/li\u003e\n\u003cli\u003eLeveling bolts (quantity 2)\u003c\/li\u003e\n\u003cli\u003eSoapstone spacers (quantity 2)\u003c\/li\u003e\n\u003cli\u003eMetal fireplace-installation label\u003c\/li\u003e\n\u003cli\u003eChimney-liner brackets (quantity 3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Accessories\u003c\/h3\u003e\n\u003cp\u003eAll accessories are sold separately and installed per their instructions and the current manual.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAccessory\u003c\/th\u003e\n\u003cth\u003ePart ID\u003c\/th\u003e\n\u003cth\u003eMSRP\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteel Surround\u003c\/td\u003e\n\u003ctd\u003e94-5950110\u003c\/td\u003e\n\u003ctd\u003e$259\u003c\/td\u003e\n\u003ctd\u003eThree-sided steel surround that attaches behind the cast iron faceplate to frame the fireplace opening.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower Surround Panel\u003c\/td\u003e\n\u003ctd\u003e94-5950510\u003c\/td\u003e\n\u003ctd\u003e$109\u003c\/td\u003e\n\u003ctd\u003eCompletes a four-sided surround for raised-hearth installations; used with the Steel Surround.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurround Extension\u003c\/td\u003e\n\u003ctd\u003e94-5950010\u003c\/td\u003e\n\u003ctd\u003e$149\u003c\/td\u003e\n\u003ctd\u003eAllows the insert to project 2\" or 4\" into the room, reducing the required fireplace depth per the current manual.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiner Hook-Up Starter Collar\u003c\/td\u003e\n\u003ctd\u003e94-67500\u003c\/td\u003e\n\u003ctd\u003e$160\u003c\/td\u003e\n\u003ctd\u003eHearthStone-recommended liner connection option for easier installation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFire Screen\u003c\/td\u003e\n\u003ctd\u003e94-69500\u003c\/td\u003e\n\u003ctd\u003e$199\u003c\/td\u003e\n\u003ctd\u003ePermits open-door, direct-fire viewing; never leave the insert unattended while the fire screen is in use.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMantel Shield\u003c\/td\u003e\n\u003ctd\u003e94-79700\u003c\/td\u003e\n\u003ctd\u003e$239\u003c\/td\u003e\n\u003ctd\u003eShield for combustible mantels, approximately 48\" wide and trimmable; install per the current technical data sheet.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOffset Liner Adapter\u003c\/td\u003e\n\u003ctd\u003e5700-007\u003c\/td\u003e\n\u003ctd\u003e$409\u003c\/td\u003e\n\u003ctd\u003eOnly for installations where no other connection option is possible and the total fireplace and chimney height is at least 20 feet per the current manual; may cause smoke roll-out when the door is open.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside Air Kit\u003c\/td\u003e\n\u003ctd\u003e94-53500\u003c\/td\u003e\n\u003ctd\u003e$129\u003c\/td\u003e\n\u003ctd\u003eConnects outside combustion air to the insert; recommended for airtight homes. Requires separately supplied 5\" insulated HVAC-type duct meeting the TDS requirements.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003eThe GMi70 is covered by HearthStone's limited warranty as published in the current owner's manual, where Limited Lifetime is defined as ten years. In summary, the applicable schedule covers external stone, cast iron components not listed elsewhere, and the clean-burning air-supply system for the Limited Lifetime period; door handles, latches, steel components, and the firebox for five years; appliance electrical components, refractory stone, vermiculite panels, and baffles for two years; and enamel finish, glass, accessories, and components not otherwise listed for one year. Warranty labor is covered in the first year through an authorized dealer when the appliance is dealer installed. Coverage extends to the original purchaser and is not transferable; conditions and exclusions apply. See the current written warranty for complete terms.\u003c\/p\u003e\n\u003ch3\u003eAbout HearthStone\u003c\/h3\u003e\n\u003cp\u003eHearthStone Quality Home Heating Products of Morrisville, Vermont has built stoves prized for long-lasting, comfortable heat for more than four decades. The Green Mountain Insert 70 brings HearthStone's signature soapstone lining to a flush-fitting wood fireplace insert offered through authorized dealers.\u003c\/p\u003e\n\u003cp\u003eCozy Glow Stoves is an authorized HearthStone dealer. Visit our Logan, Ohio showroom to see HearthStone products in person, or contact us with questions about the GMi70, current pricing, and installation planning.\u003c\/p\u003e","brand":"Hearthstone Stoves","offers":[{"title":"Default Title","offer_id":53689714508052,"sku":"8450","price":4599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/9381\/2756\/files\/GMi708450_NB-matteblack_200517.webp?v=1787103292","url":"https:\/\/cozyglowstoves.com\/products\/hearthstone-stoves-green-mountain-insert-70-wood-fireplace-insert","provider":"Cozy Glow Stoves","version":"1.0","type":"link"}