Which heating system to choose when replacing the heater after 36 years?

What I would like to know now is, what do you think about fully demineralized water in the circuit. My heating engineer says it is better for the boiler and the radiators. What bothers me a little is that every time water needs to be refilled, I have to get it from him.

Does it really make that much of a difference, fully demineralized or normal water?

And he recommended a water softening system to me.

What would you say about that?

Thanks in advance

I have also read the recommendation, but as far as I know, it was not done for me. Could it also depend on the type of pipes and the delivered water hardness? Some pipes may be more susceptible than others. It certainly doesn’t do any harm; it will just be more expensive than normal water. Does it help? I rather don’t think so, otherwise many homeowners would have problems. Also, new water is not constantly added to the heating circuit, so the lime content is limited.

However, I had a water softening system installed because very hard water is delivered to us. I don’t have long-term experience yet; the system has only been running for a few weeks. I only know that with hard water, something constantly gets scaled, even the toilets where the water is cold, and of course water kettles and other heating appliances even more so.