Some time ago, there was an authoritative research institution (I forgot the specific name, but it was authoritative anyway). Through a series of investigation and analysis, it is concluded that the top ten brands of air energy water heater rank first: Fanny air energy water heater ranks second: Zhicheng air energy water heater ranks third: Yi Tong air energy water heater ranks fourth: Smith air energy water heater ranks fifth: Muyu air energy water heater ranks sixth: Changling air energy water heater ranks seventh: Gree air energy water heater ranks eighth: Jinjiang Bailang air energy water heater ranks first.