Approx the first 6.5 feet of either hose is not heated. I run my cables straight along the hose and between the outer hose and the snuggle hose fleece cover.
With the 15W cable I can heat 5 feet of my 6 foot standard CPAP hose.
With the 25W cable I can heat all 8 feet of my extended CPAP hose with some heated cable left over
I did not get any rainout with either cable with humidity set to 4. Both cables seem to warm up to same temperature. The air is warm and i can see me wanting it to cool it down using a dimmer after winter time.
I have not tried the 15W cable in my 8 foot hose
Photos of both hoses with Repti cables and my preferred setup using an 8 foot heated hose over my headboard.

