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the problem is that while you don't need a lot of hot water for the lavs and the kitchen sink, the washing machine and the showers do. is your current heater a tank-type? you mention space being an issue.....would a low-boy heater fit? i.e. 30" tall, 22" around? i'd put a 40-50 gallon low-boy in instead of an electric tankless......and if you like long showers, your electric bill is going to noticeably rise...that said, yes you can find a large demand electric tankless heater.....look at state, lochinvar, rinnai, takagi, and eemax. some of those only have gas options....some don't, sorry i don't remember which.....
It's pretty limited space, I doubt that would fit. The other problem, is we have one now and all the wiring and plumbing is up high, almost 6ft up the wall.
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How good is your water quality? We haven't good luck with electric on demand heating elements and hard water. We shy away from those personally.
If we do install a tankless it is generally a Rinnai.
It's terrible! I have to CLR the kitchen faucet every week or so. The plumber thinks that is what fried my water heater.
I will check out those heaters, especially rinnai because both of you suggested it.
Thanks!!