This $2,000 Bitcoin mining water heater can pay for itself by slashing your energy bills, company claims — can rake in $1,000 a year in BTC, offset 80% of electricity and water costs

https://www.tomshardware.com/tech-industry/cryptomining/bitcoin-mining-water-heater-firm-says-its-usd2-000-product-can-rake-back-usd1-000-a-year-in-btc-and-claims-it-can-offset-up-to-80-percent-of-electricity-and-water-costs