Diplomat Chimney Fireplace Flue Heat Exchanger/Hot Air Exchanger, Exhaust Gas Cooler Black, XL Diameter 130 mm, 5 Pipes with Damper

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I could put any number of ports through the heat exchanger, then cap them off on the top with another box that goes to a single larger pipe.

The essential idea is to have a few pipes run under your fire (though not under flooring, so embers can land on them) then have the pipes run along up the rear of the fire and bend over the flue and then end just before or just after the top of your fireplace. I plan to burn this thing at full bore, and always when I've operated a wood stove this way I've had no problems with creosote. My boiler was built out of a 500gal propane tank that I shortened the length of, and I used a 3/8" wall 36" diameter structural steel pipe for the firebox that I fitted ends on.

After about 2 hours all of the Zinc coating had lifted off the steel and was floating around the top of the bucket.

Magic Heat Wood Stove Heat Reclaimer/Blower- Flue Heat Exchanger What is the purpose of a Wood Stove Heat Reclaimer -FlueHeat Exchanger? In either case, altering the boiler into a condensing appliance is something that's fraught with consequences that will cause you to soon be purchasing that new boiler which you say you can't afford. I'll have some soapstone handy and mark the spot where I had to restart, then reheat that spot with the acetylene torch to get it good and melty. Or just make a box with NO fire tubes in it, and allow enough space for the smoke to go around the HE on all sides, and weld some baffles inside to make the air travel all throughout the box (rather than taking a shortcut directly from the intake to the exhaust ports) .Air pressure test at a low pressure - say 10 PSI - so I don't blow the thing to smithereens before it is finished, and use soapy water to find pinholes. I'm not sure from your description if your saying that your boiler vents directly out the side wall or vents into a chimney outside the wall.