... 4.No sacle with long life span Dual Mode water heater details: (10stalls +constant temp function)A ) ... water; 10, temperature accuracy of ± 1 °C; 11,stall and constant temp (two model)convert 12.10stalls for stall setting 13 ... , unique, patented plate heater, the water real isolation.C) Safety protection: ... 40' HQ: 3,200pcsPhoto Shows tankless water heater electric