NOVELTY - The water heater has a light transmitting cover plate arranged on an upper part of a micro-channel parallel flow solar energy heat gathering device (1). A micro-channel parallel flow solar energy heat gathering element (3) is arranged on a heat insulating layer of a heat insulating base (2). A layer of selective solar energy absorbing films is combined on a surface of the element. A heat storing water tank (301) is arranged on an upper part of the heat gathering device. A heat exchanging pipe is formed via aluminum flat pipe, copper pipe or efficient heat conductive plastic coiling.    USE - Household micro-channel parallel flow solar energy water heater.    ADVANTAGE - The water heater improves the heat exchanging efficiency and solar energy heat efficiency via the micro-channel parallel flow technique. The solar energy passing through the cover plate can be efficiently absorbed. The water heater effectively improves average efficiency of the sunshine in winter via combining the vacuum cover plate structure. The hot water in the heat storing water tank can be heated via the heat exchanger, or the hot water and the water mass in the water tank can be directly cycled in the water tank to reduce cost. The water heater has high effective water output effect, better sanitary condition, compact structure, low cost, better weather resisting effect, and convenient mounting and maintaining effects. The water heater has bearing and freezing resisting function.    DETAILED DESCRIPTION - The heat exchanging pipe is copper pipe, stainless steel pipe, carbon steel pipe corrosion resisting layer, or efficient heat conductive plastic pipe. The working medium in the pipeline of the micro-channel parallel flow solar energy heat gathering element is water, glycol freezing preventing liquid, alcohol and carbinol.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a household micro-channel parallel flow solar energy water heater.    Micro-channel parallel flow solar energy heat gathering device (1)    Heat insulating base (2)    Micro-channel parallel flow solar energy heat gathering element (3)    Aluminum flow dividing and gathering device (4)    Internal water tank (301)    Internal heat exchanger (302)    Solar energy cycling pump (303)