Hi I am considering purchasing a Vortex kit to heat my 15x24 above ground pool. I can fit 4-4x10 panels on our existing single story roof that is over our deck. Southern exposure, full sun the entire day. I'm looking at the deluxe kit on solardirect.com and the parts they include are for 2 inch PVC but our existing plumbing is all 1.5 inch. Should I call and request that they send a different kit with all 1.5 inch parts? Or should I plumb it with 2 inch and reduce it when I connect it to our existing plumbing? Thanks for any advice!