First it was light bulbs, now Uncle Sam wants your water heater to be more efficient - and it could cost you a lot more money to comply with the new rules. Angie's List founder, Angie Hicks, said new regulations will save money in the long run. “Your water heater is the second largest consumer of energy in your home right behind your heating and cooling system. So, any improvement in your water heaters efficiency is going to pay dividends in your monthly utility bills.” But it will cost you more in the short term, if you need to buy...