What to Do to Get Cheap Hot Water for Shower?

So 20 years ago my mom had the water heater thing element cut in half (so I'm told) to reduce the power bill. Is this a thing?? Well time to reverse it if it's a thing. But problem is it's too expensive?? somehow…
Do we get a huge water heater to replace the little halve size mini fridge one?

What is the cheapest option to get hot running water to shower a few people…

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