Home Tech: A Hot Heater

Tankless gas water heaters are already thrifty—about 86 percent efficient—but a condensing coil that absorbs heat from escaping exhaust squeezes 94 percent out of this one. It'll vent with plain old PVC.

Prestige Condensing Tankless Water Heater, by Rheem; $1,200; rheem.com
Ask TOH users about Easy Upgrades

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