High Temp Solder

hot_rod

the JW Harris Blockade. It melts a few hundred degrees cooler than silver solder and is very easy to work with a mapp gas torch.

Sounds like you are expecting some very hot temperatures around that stove? be sure the walls and floors are protected properly.

Consider threaded steel pipe.

hr

Noah

I'm designing a DHW system that uses finned cooper (old baseboard) over my woodstove, manifolded up to circulate through a electric hot water heater, with a temp control switching on the circulator. It has a tempering valve bypass (to a run of baseboard) to expell any extra heat. I was planning on using regular lead free solder. It would be fine as long the system is online during the heating season. I want to be able to drain the system down and valve it out in the summer months. And I want be able to use the woodstove when the system is offline without melting the solder joints directly over the woodstove. Can I use silver solder on a potable water system to do this? Can I even silver solder with mapp gas on 3/4 copper successfully?

bob young

silver solder

nothing wrong with brazing potable domestic water . it is prefered by most codes. knapp gas should work ok but i prefer acetylene with a turbo torch type rig.

Noah

Your right hot rod...I think silver may be a bit overkill..I should be fine with standard solder as long as I don't put the joints directly over the stove...

Rich Kontny_3

Fin Tube

Noah,

I would be more concerned about the aluminum fins on the fin tube as they are glorified tin foil. Also why drop it out in the summer you could still pick up some ambient temperature advantages by running water through this assembly year round. Also there may be issues with the very thin copper used for fin tube. If you are using a commercial grade fin tube this may not be a problem.

Wood stoves are probaly not the greatest when it comes to efficiency, yet I applaud your efforts to squeeze some btus out of waste heat(especially if this is an existing stove)

Rich