Water heater system, comprising a water heater , a wall mounting bracket having at least two hook receiving portions , at least two hooks coupled to the water heater configured to engage into the at least two hook receiving portions of the wall mounting bracket , wherein the hook receiving portions are arranged in the wall mounting bracket without a connection to a circumference of the wall mounting bracket , and the water heater system further comprising a fixation bracket coupled to a housing of the water heater , wherein the fixation bracket comprises at least two first through holes (221 - 226) arranged substantially in the middle of the fixation bracket , which are configured such that the fixation bracket is mounted to the water heater , and at least two second holes (231 - 236) configured for fixing the hooks to the fixation bracket to allow a vertical or horizontal mounting of the water heater , or an outer bracket configured to be attached to a round housing of the water heater, wherein the outer bracket comprises a first and second end , a middle portion and two mounting portions , each between the middle portion and the first and second end , wherein the at least two hook receiving portions are configured to allow a vertical or horizontal mounting of the water heater , wherein the at least two hooks are attached to the fixation bracket or to the outer bracket in a way that the at least two hooks engage into the at least two hook receiving portions in a first direction to allow a vertical mounting of the water heater , or wherein the at least two hooks are attached to the fixation bracket or to the outer bracket in a way that the at least two hooks engage into the at least two hook receiving portions in a second direction being perpendicular to the first direction to allow a horizontal mounting of the water heater . a water heater , a wall mounting bracket having at least two hook receiving portions , at least two hooks coupled to the water heater configured to engage into the at least two hook receiving portions of the wall mounting bracket , wherein the hook receiving portions are arranged in the wall mounting bracket without a connection to a circumference of the wall mounting bracket , and the water heater system further comprising a fixation bracket coupled to a housing of the water heater , wherein the fixation bracket comprises at least two first through holes (221 - 226) arranged substantially in the middle of the fixation bracket , which are configured such that the fixation bracket is mounted to the water heater , and at least two second holes (231 - 236) configured for fixing the hooks to the fixation bracket to allow a vertical or horizontal mounting of the water heater , or an outer bracket configured to be attached to a round housing of the water heater, wherein the outer bracket comprises a first and second end , a middle portion and two mounting portions , each between the middle portion and the first and second end , wherein the at least two hook receiving portions are configured to allow a vertical or horizontal mounting of the water heater , wherein the at least two hooks are attached to the fixation bracket or to the outer bracket in a way that the at least two hooks engage into the at least two hook receiving portions in a first direction to allow a vertical mounting of the water heater , or wherein the at least two hooks are attached to the fixation bracket or to the outer bracket in a way that the at least two hooks engage into the at least two hook receiving portions in a second direction being perpendicular to the first direction to allow a horizontal mounting of the water heater . <EOS>