I assume when you say full of calcium, that you have very hard water. For me that eliminates a tankless heater immediately. It will scale up way faster than your tank. I have replaced many elements in hot water heaters where the water was hard. Just get your self set up with everything you need. If it bolts in get a couple spare bolts. We used to always carry spare elements and spare bolts on the truck, and plan on replacing bad elements when we encountered them. For hard water you should put in a low watt density element. It takes them a lot longer to scale up.
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