I already posted on the galv fittings on the hot water side. I do have brass on the cold water side which is a good idea. I have the galv elbows in the hose reels and I would image the internal pipe as well. They need to go asap.
The elbows into/out of the hx really concern me. I really don't even want to look at them.
The hoses can be replaced with new fittings for about $100. So I will just mark it down for 12 months to change them out. I happen to have a parker dealer about 20 mins from me.
When you see the rust in your filters, then change them quick or it will get worse quickly.