I have two 16 foot hot water baseboard heaters on the zone in my unfinished Basement. The basement is 1500 sq. ft. with 8 ft. ceilings. I am re-piping because I had to get rid of the kitec piping in our home. We are using the fin type baseboard hot water heaters with 3/4 inch inlets and outlets. My question is can I re-pipe using 1/2 inch oxygen barrier pex pipe in the basement. I am using the oxygen barrier 1/2 pex on the main level of my rancher. There are two zones on the main level and each zone has only 25 ft. of baseboard each. Thanks