Post by invention1 on Sept 7, 2020 6:49:55 GMT -8
Basics: 8" stove, metal bell made from a 100 gallon water heater tank, flue has a bypass. Door from a barrel stove kit. Cleanouts in the bench and masonry bell two places. Went through one winter without tile, very successful heating season. Cleanout after heating season showed very little ash or buildup inside the bench and bell. Bell sanded to bare metal and painted with Rustoleum Ultra High Heat "Aged copper" color. Baked the metal bell out in the driveway for several hours to cure the paint by making a quick and dirty rocket stove out of loose firebricks under it for a while. Still had problems with paint outgassing for the first few fires once the bell was installed permanently - it'll set off the fire alarms. Bell is welded onto a flat flange, which is then bolted down to the masonry over 3/8" spacers and sealed with a 3/8" wide silicon rubber sealant joint.
Theoretically the ISA should be 101 sq ft, this has about 97 sq ft, a bit shy but it works quite well. Core is insulated with a layer of flexible and rigid ceramic fiber insulation, riser is a basic 5 minute riser made out of a 10" diameter steel duct lined with ceramic fiber to make an 8" diameter riser. The bench is insulated and has a 2" air space between the bench and the wall, as well as 4" of masonry, for safety.
Core is cast out of Harbison Walker "Mizzou" castable refractory assembled with Blakbond refractory mortar. The rest of the bell and bench is made of solid 8"X8"X16" concrete blocks, the tops of the masonry bell and bench are steel plates supported by angle iron, with two sheets of concrete tile board plastered on with thinset tile mortar and anchored to the masonry with counterset tapcon masonry screws. "Mizzou" is actually mined about 30 miles from my house, but I had to drive 130 miles to pick it up!
I have very little problem with the stove smoking when the door is opened, because the top of the door is designed to be below the top of the port. This, with a strong draw in the chimney (about 25 feet tall) and the bypass makes it not smoke like many rocket stoves will.
Bench is quite comfortably warm, we usually keep a thin blanket on it for a bit of padding and because it gets a little too warm at times.
Carbon Monoxide sensor on the wall for safety, plus a USB charging outlet for the phone.