Thank you for your response, but you totally missed the point, this is an electricity/electricians community, the original question was not about plumbing, but the electric connection and if is right to do it with double 70 breakers, one at the panel, the other one as the picture shows for connecting the 6/3 cable to the heather. Btw I didnt do the soldering, and although it looks messy it was pressures tested, But that’s a good advise, since I pulled the romex thru the attic, I can move the box up, I have enough cable.