I'm installing BBHW (slant-fin 30).I will have to connect low temp radiate floor heat to system to a new boiler.Could I have temp set at 150 degrees,yes I know I would have to have more feet of slant-fin. I was wondering if I use 150 instead of 180 the return should be around 130 or so.This temp would then be low enough to pipe to the low temp radiate heat.I am also thinking of using a lot of PEX and some copper.Any problem with this way of thinking.