The bloke who put our system in actually teaches plumbing after many years in the field. He did an excellent install for us, so professional and neat. Our condensate pipe is internal, and drips into a plastic cup type thing which goes straight to sewer. Nothing outside at all.
Mind you, he also plumbed it in so all you have to do to drain the entire system is connect one flexible pipe and turn a lever and the entire system drains to the sewer. No buckets or hoses or anything.
The boilers are designed well, it’s just the muppets that fit some of them that are the real problem. 🙂