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Basic components of a gas tankless water heater include a high-powered burner, fan, and heat exchanger; condensing gas water heaters also have a secondary heat exchanger and a piped air intake to the sealed combustion chamber
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Compare gas tankless water heater efficiencies on the Energy Guide labels or look for the ENERGY STAR label
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Right - EPA WaterSense-rated low-flow plumbing fixtures are verified as using less water than typical plumbing fixtures.
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This wall-mounted high-efficiency condensing gas tankless water heater has PVC vent pipes and insulated water pipes
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