Web site for Tank in Tank http://www.triangletube.com/Residential/ProductIWH.htm
And design picture http://www.triangletube.com/Residential ... esign.html
I appreciate the information. I think the coal is pretty good quality. It burns equally well in the kitchen stove, Elmira, which is now “Heartland”. The chimneys are virtually clean when I check in the spring.
Our wood here, Southern Alberta, Canada is poor quality and a bit sparse. We are a semi arid area. 50 miles away cactus grow, just little ones, but cactus. I use some, but I prefer coal. More heat, a lot less work, cleaner chimneys.
You are absolutely correct about loading. Dump too much in, sometimes small explosion, sometime a bit bigger. Learned my lesson quickly.
I have converted my house, 2000 sq. ft upper and 2000 sq.ft walkout to water heat. Upper is now water to air and lower is Myson radiators. 186000 btu gas boiler supplying hot water at 176F. House is 9 years old, very well insulated and quite air tight. The TLC had no problem heating the upper floor in all but the coldest weather, then I light the cookstove as a back up. I am converting because the lower floor was unused, but now will be my wife and I,s home as we turned over our small farm to our children.
Glad to hear 1” pex is large enough. I have a 500,000 btu flat plate water to water to connect boiler to existing system. Then each is separate, and only the boiler needs freeze protection.
I built and installed the heating myself. Everything works well, EXCEPT, the domestic water heater. That is a large electric tank with a flat plate and a pump. I never thought it out properly ahead of time. It’s very inefficient, and needs to run too frequently. Thus input on tank in tank, or anything else.