Glenn Herbert wrote:You start by saying the chimney liner is 7" diameter, but later mentions indicate that it is 7" square. Given a straight vertical internal chimney, you should have very strong draft, and I would guess that it could support an 8" batch box. The critical thing to know is the house size and insulation level, combined with the climate which you have described. A 7" or 8" batch box can put out a lot of heat; a 6" batch box is often used to heat an ordinary cold climate house (not upper Canada).
Instant heat is easily accomplished with a steel access panel in the side of the masonry bell, and serves to allow inspection and maintenance of the heat riser. It doesn't need to be any heavier than what is physically sturdy for sealing (mine is 1/8" thick, and feels extremely robust.)
I am assuming that the base of the hearth is strong enough to support the several tons of mass you are planning to add to it.
There is no need to block off the bottom foot of the bell space; the hot gases will not go down significantly below the exit. Just a bit of insulation on the floor should be sufficient, and if there is a basement, I would consider the bit of warmth radiating down a benefit.
Satamax Antone wrote:Well Samuel. That's right up my alley.
First, we need to know what is the size of the house. To see if 7" would be enough.
Secondly, is it possible to remove the terracotta liners? What is between the liners and the bricks?
The brick chimney itself can become the mass. If the heating is baseboard electric, i wouldn't insulate the bottom of the bell from it. It can cope with heat.
Thirdly, yep, you can make metal bells. A barrel is pretty much that (well, more of a downdraft channel radiator)
But i live with a metal bell.
Read the whole thread. THis is work in progress.
Satamax Antone wrote:293m², and about 700m3 (a bit more actually)
I would advise at least a 10/12 inch batch. And a good two more tons of mass.
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