Abstract: The water temperature often fluting up and down is the gas water heater user pain point. Due to the shower switched off ,the burner stop to work, but there are still cold water keep inner pipe not to be heated, so if the shower switched on again, beginning is hot water, then the cold water follow out. So how to control the outlet water temperature is the core issue. There some research updated the control algorithm software to get better result, utilize the before feedback and after feedback method, perfect the temperature in advanced. By referring to the TRIZ solution, try the structural hardware solutions, try to solve it from the two aspects: ①Object field (add inner recycling pipe) method; ②Solution to technical conflict (add the water pot), set up the solution model and try to test them one by one or combine two of them together. After many times test and date analysis, evaluate both the cost and result, choose the water pot and inner recycle solution. It can efficiency reduce the temperature vibrating and shorten the recovery time.

Key words: TRIZ, Water pot, Inner recycle, Model, Constant water temperature