In part 1 in our Smart Home series we search for the most energy efficient water heater. Ever thought about going tankless? Heard of electric heat pumps? Just want more efficiency? Spend more on your tank and save even more on energy costs – this week we compare three options for high energy efficiency and install the one we like best in host David Dodge's home. That's this week on CKUA's Green Energy Futures. See blog, photos and video.