Bellows-type edge surface treatment, an increase of the surface of the refraction of light in the tube surface, so that heat absorption area of a significant increase in collector tubes to speed up the tube of the heating rate. At the same time improving the efficiency of heat absorption, based on accelerated thermal cycle design, effectively improve the frequency of cold water circulating heat, so thermal energy rushed out to achieve rapid heating. Innovative corrugated three high collector tube, set the three executives and the advantages of a bellows