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 https://github.com/kelvin200/some-investment-books

 PTC Ceramic Heaters automatic temperature control - can set temperature no light   no fire dangers --- safe -- than Mica heater ... air dryness problem due to fan -- than Mica heater  place water in tub slow heating ..  safe https://amzn.to/48ZyEEu https://amzn.to/4oOLGJw https://www.youtube.com/watch?v=ShJsyhmDo-Y MIca heters.. temperature settings as only 2 settings of thermstat fire safety no safe as ptc no dry ness.. no fan no noise.. quic heating  https://amzn.to/3LkpLeK