Assertion: water heater's element | /r/HasProperty | added
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Source sentences:
text: Condensing tankless water adopts two heating exchangers, one gets heat directly from the gas burner while the secondary elements are added, normally stainless steel materials, to recover the wasted gas from flue gases, through such smart design, the efficiency of energy reaches as high as 90%, which solves the problems of gas-wasting to large extent.