Winter is close, and the nip is back. In Shimla and Manali, evenings already need a shawl, and dawn taps feel lukewarm. Hot water is no longer a luxury; it is routine. The question is not if you need ...

You know that big tank of hot water in your basement? What if we told you that you could get the same amount of hot water (or more) from a water heater the size of a carry-on suitcase—and save at ...