Water heaters aren't exactly the most splashy consumer product. But they're key to comfortable living. Meet the <a target="_blank" href="https://myheatworks.com/">Heatworks Model 1</a>, a digital wate
<img src='https://techcrunch.com/wp-content/uploads/2011/06/heat-recovery-technology-2.jpg'>
Storing heat may be the last thing you think of when turning on an air conditioning unit, but one model ta