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The Rheem Performance 18 kW is an electric tankless water heater that modulates its heating output to match demand instead of cycling on and off at full power. It runs on 240 V and needs a dedicated high-amperage circuit, so installation is a licensed-electrician job. It suits households that want endless hot water from a compact wall unit and have the electrical service to back it up. Against gas tankless rivals it avoids venting and gas lines, but its output limits how many fixtures it can serve at once.
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Lowest price we've seen: $449.00 on Nov 14 at The Home Depot. Tracked across 1 store since Nov 14.
