Homes of 2000 – 3000 square feet can be heated by the wood unit depending on the type and quality of insulation. The refractory modules are easily assembled reducing installation time and ensuring proper function. A specially trained installer is not required. The internal design allows the large masonry mass to absorb the fire’s heat. High temperature fires provide superior efficiency resulting in reduced fuel consumption and the elimination of creosote buildup. The frequency and expense of chimney cleaning is reduced. Fires lasting 1-2 hours (3-4 hours for gas) at 12-24 hour intervals provide continuous heat. The fireplace modules are made of durable high temperature refractory material which will provide years of service. An optional stainless water coil can provide domestic hot water.With no creosote accumulation, the danger of chimney fires is eliminated. Since heating continues after the fire is out, one can leave the home without concern for an unattended fire. EPA certified woodstoves must meet a 7 gram per hour particulate emission rate. Temp-Cast woodburning fireplaces emit 1-2 grams per hour. 1
Back in England, Rumford applied his knowledge of heat to the improvement of fireplaces. He made them smaller and shallower with widely angled covings so they would radiate better. And he streamlined the throat, or in his words “rounded off the breast” so as to “remove those local hindrances which forcibly prevent the smoke from following its natural tendency to go up the chimney…”
Throw some Quail Egg or Black pebbles on these to give it a rustic look. These stoves are clean burning, provide a hot flame and require no ventilation.
Cast Iron Grate Heater
Thermorite Cozy Grate Heater
fireplace grate heat exchanger with blower
Cast Iron vs. Masonry
Construction: fire brick then insulating concrete then rock wool
Chimney: air cooled heavy duty cast iron w/ fins pipe followed by standard pipe
Heat exchanger: Cast iron roof with large quiet fan. Built in grate tubing
Fans: Large german (spiral) type quiet fans driven by pole gear. Motor buried in wall.
Air intake: from outside, injects just in front of glass door to keep glass clean. Fan assisted
Flue: towards the back of the fireplace. Promotes front to back airflue
Removable door hinges
exhaust / intake: covered by pillars for cosmetic reasons
Heat Exchangers: standard iron pipe threads for 1 1/2 or 2″ pipe. Straight iron pipe w/ fins for top. Rectangles on bottom for grate. fins on flue.
Heat Exchanger flow: air is pumped through bottom and aided by convection through the top pipes. Standard iron pipe and 90 degree elbows connect the top and bottom.
Cleanup: Removable floor pan of iron for easy removal and water tolerance (no crack cooling shrinking tolerance), sand & ash trap
Durability: 2′ brick along walls and bench in front of fireplace. At least 1 or 2 more feet of tile in front of that.
Multilayer cabinet for storing wood inside. 6’h x 2’w x 3′ deep
Thermal Mass: Soapstone & iron pipes filled with water. Exhaust from heat exchangers can be used to heat up the water pipes. Water weights 8.345404 lbs or 3.7854118 kgs per gallon. 12″ iron pipe that’s 8′ tall holds 6.285 cubic feet. 1 cubic foot equals 7.4805 US gallons. That’s 388 lbs of thermal mass per 8’x12″ pipe. Water chamber contained in rockwool to provide a slow release of heat. Would be wise to have a drain at the bottom in case one of the pipes rusts out. Coat the inside w/ naval paint & primer. Connect a sacrificial anode to the outside.
Masonry Heater Association
Hearth, Patio Et Barbecue Association
EPA stove and fireplace page
DOE Pellet stove page
Wood Burning Guidlines