I'm new and I'll admit I don't know much about plumbing, but here's my 2c.
This could be an excellent application for a lower-end electric tankless heater. As they only raise the temperature of the incoming water, and this is mostly a winter only problem, you could give your 50 gal enough cushion to fill a tub. I'd plumb it so you'd be able to completely drain it and turn it off during the summer months. They make 30amp double pole switches for turning off a wh.
This is awkward, but...
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