I/we had similar problems
I would get a good plumber involved. It may or may not be the boiler coils. If you are on well water you can usually count on replacing things like the mixing valve, auto fill valve, and expansion tank due to well water sediment about every 10 years unless you have a filter on your water line.
I would go to an electric hot water heater or when you do have the problem fixed look into a timer for your boiler for the summer. We started last year turning off the boiler in the morning and turning it back on when we needed it, usually the next morning. And it only takes about 5 minutes for our water to come up to shower temp.
We saved ½ a tank of oil last summer doing this. That is about $400 in savings.
Good luck with your new house.
I am surprised the home inspector did not catch this problem.
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