Need a link to someone who has added 2ndary burn tubes to a older unit

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moresnow

Minister of Fire
Jan 13, 2015
2,356
Iowa
Buddy would like to f_rt around with a old unit. Needs to know the material used. Pipe grade etc. Thanks
 
Regular old black iron pipe works well enough for short term experimental purposes, once the final design is settled on 308 SS has held up just fine for me
 
moresnow
I have done some with my homemade boiler, I am still experimenting getting the flow right but have been running black iron, all last season and going now to heat DHW. PM if you want more info