You are correct. The input on the wall wart is 100-120vac 1.5a (150watt to 180watt) but the output is only 12.0vdc 4.6a: 55.2 watts The "xFi Advanced Gatewa

You are correct. The input on the wall wart is 100-120vac 1.5a (150watt to 180watt) but the output is only 12.0vdc 4.6a: 55.2 watts The "xFi Advanced Gateway (XB7)" router is definitely warm to somewhat hot on the outside. The AC here varies from 118vac to as high as 126vac (maximum rating.) Right now it's at 122vac. I think my 185 watt number might have been 123.3vac x 1.5a, or maybe it was the previous "xFi Advanced Gateway (XB6)" which was also a chimney. I am not an ISP. We work remotely — there is no fiber here yet.