Rheem’s Prestige Series Mid-Efficiency Indoor Tankless Gas Water Heater with Built-In Recirculation provides continuous hot water on demand while reducing cold-water waste. The Prestige runs only when turned on by the user; when activated, it recirculates cold water through a return line instead of letting it run down the drain. The company claims that this recirculation can save a household a significant amount of hot water and energy. Rheem’s Prestige heater is priced from about $1,200. rheem.com

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