Polaris Water Heatersby American Water Heater

Polaris water heaters are among the most efficient tank-style water heaters on the market. They have sealed combustion burners and self-diagnostic controls; the stainless steel tank has 1-inch side taps for space heating applications. Venting is through the wall with 2- or 3-inch plastic pipe. Retail prices start at about $3,300, which includes tempering and pressure-relief valves. 800/937-1037, www.polariswaterheaters.com

American Water Heater