heating water with a flue pipe

[SteveORama]

I have a friend who owns a Brew Pub and Bread making restaurant. The flue pipe coming of the wood fired bread oven runs about 12' across to the all fuel chimney. He would like to capture the heat from the flue pipe to heat his hot water that they use in their kitchen (they run out of hot water at the end of the night). I have a lot of ideas of how we could rig something up but does anyone know of a manufactured part/ system that might work?

 

[pring7]

This may be an option: https://www.hearth.com/econtent/index.php/forums/viewthread/70302/

 

[pen]

just be warned that cooling flue gasses means increased creosote production = increased chance of a 2000+ degree chimney fire.

pen

 

[corrupt]

just be warned that cooling flue gasses means increased creosote production = increased chance of a 2000+ degree chimney fire.

pen

Which would get you water hot real guick.

 

[pring7]

I would like to see a picture of the bread stove. My Grandpop was a plumber and he used to heat water through a water coil in a soapstone stove (I think it was a Woodstock classic). The problem with it is that you need some safeties. I have two safeties in my solar hw heater. One is for excessive temperature and the other is for excessive pressure. It may be safer, simpler, and cheaper to just use solar for your friends dhw needs.

 

[BrotherBart]

With a 12' horizontal run he is already acquainted with creosote. He doesn't need to invite it any more than he already does.

What is the rest of the flue setup?

 

[Dune]

http://www.hilkoil.com/product.htm

 

[Corey]

Wouldn't touch this one for my life - except to say get plenty of CO detectors if you try it. Cold water around a flue pipe is a recipe for loosing draft and backing up flue gas into the occupied space.

 

[SteveORama]

Thanks for your ideas. I will be going to look at the job this week and let you know what I find. I will try to send Pics as they tell the story.