I don't blow, just pink up.
I put a similar system in the S&B for when I head south for the winter. I plumbed in a pump, put a bypass for the HWH, and run the pink though the whole house. I throw the breakers to the house, no sense heating it if I'm not there.
I have a pretty good check off list, which took years to complete, because there are things you don't think of. Like the saddle valve to the fridge ice maker, the water in the washer pump housing, etc.
When I just blew, I always had breaks in the pipes when I got back, the pink fixed all that.