Why do you want the 8 mm we have used both over the years and the 6mm is far easier to use and pull round corners , there is no noticeable difference when using 6 mm either providing you re calibrate your controller s some ware buirried in my garage I have 2x100 meters of 8 mm ( red hot hose) that I took off the van as it was just so heavy , try the 6 mm Ime sure you would never go back to the 8 mm we certainly won’t . The orange hose was discontinued several years ago as it was constantly sticky and stretched like elastic , it was replaced with the red hot hose that’s a totaly difference animal very nice hose but it’s to heavy in 8 mm the 6 mm is fine give it a try , to be fair normal Gardiners yellow microbore will last a couple of years with very hot water we use it on our vans 8 hours a day 5 days a week light and easy to move after two years just replace it