Not familiar with the HF one, but I had a Winco 50 kw run 80 kw start or surge. This gen would run my whole house without question.
I had to run it for 14 to 16 hr/day for three days a few years ago. The fuel cost me $700.00. The tractor has 120 hp. It took at least 100 hp of that.
I sold it and put in a propane Generac 22 kw. Technology lets one air cond. start at a time and the second 5 mins. later. This way I can basically run the whole house.
I am surprised that the HF doesn't have more surge kw.