To provide a water heating equipment with antifreezing electric heater which is constituted to suppress its power consumption by reducing the number of attached antifreezing electric heaters by utilizing the heat radiating characteristics of the heaters to the maximum.

This water heating equipment is provided with a hot water supplier 1 having a hot water storage tank 2, a circulating water passage 3 which circulates water for hot water supply taken from the tank 2 to the tank 2 through a heating means 1a, and a water supply passage 4 which supplies potable water for hot water supply. The equipment is also provided with the antifreezing electric heaters 5 respectively housing heating elements 5a which heat the water and potable water for water supply respectively made to flow through the passages 3 and 4 when the outdoor temperature drops. The water pipes 3a, 3b, 3c, and 4a constituting the passages 3 and 4 laid between the hot water supplier 1 and tank 2 are arranged adjacently to each other. In addition, the electric heaters 5 are provided to simultaneously heat the adjacently arranged water pipes 3a, 3b, 3d, and 4a.