Hmm. Since you've already decided to trash the old heater, what do you have to lose by changing out the element? You gotta drain it to move it, anyway.
A tankless heater saves money, in theory, because it doesn't need to keep 40 or 50 gallons of water hot all the time. But there are other ways to save cost with an electric heater. See if your power company offers interruptible water heater service; you pay a much cheaper rate in exchange for letting the utility cut your service for a few minutes out of the hour during peak demand. Or, if nobody is home during the day, consider putting the water heater on a timer.
You are wise to be concerned about your 200 amp service being adequate to handle a 27 kW water heater. Just the furnace and water heater alone will have you service nearly tapped out. You're likely to see lights dimming when the water heater kicks in, even if it doesn't trip your main. You could go with a slightly smaller unit; I see Rheem offers two 5 gpm units, one 27 kw and another rated at 18 kw/75 amps. The latter seems more reasonable, but I'd still be concerned. If it was my house, I'd stick with a conventional water heater.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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