A inexpensive rechargable heater for the home?

So basically what you're looking for is a heater that doesn't cost anything to buy or to run. Good luck with that one. No, there are no hand crank heaters. Hand crank things work because the hand cranking takes the place of batteries. Go get a hand crank flashlight and you'll see how much cranking it takes to power a small light bulb. Batteries cannot supply enough power to heat very much at all, certainly not a house. If there was such a thing as a human powered heater, she'd probably have to spend 16 hours a day on a treadmill to run it. Whatever kind of home heating device she uses, it will need fuel of some sort brought to it. Electricity, gas, kerosene, heating oil, wood, coal, whatever. It won't come for free except maybe the wood.