I think every machine should use soft water. Soft water cleans better, but the problems it saves with you machines are well worth it. Soft is the only way to go. You will loose heat over time with hard water build up.
I would check with local suppliers Steve. I think you get the water from the same place San Francisco gets theirs. It supposed to be one of the best water in the country. I live in San Jose and water here is very hard, you're lucky.