I'm looking into finishing my basement and i'm thinking it would look a lot better if I didn't have to build a soffit around old heating pipes. I have a hydronic heating system pushing water to cast iron baseboards and radiators. The basement has older cast iron pips about 1-1/2 inches that then adapt into maybe 1 inch copper before leaving the basement. I'm estimating sizes here but I'm looking for a cheaper way or rerouting these head knocking pipes without the expense of switching to all copper. Would pex work for heating or some alternative?