**6. Conclusion**

In the work herein by means of F-diagram method we have conducted the development of liquid solar heating system and assessment of the total thermal load fraction (load on domestic water and heating), provided by the solar energy for a family of six people in Almaty city (Kazakhstan). Proceeding from the executed research, it appears that, the more a collector's square, the more annual solar energy load fraction. From experimental data it is seen that total solar radiation in summer months is higher, in winter months-lower, as well, by means of F-diagram method it has been computed that the thermal load's peak value is in January, while the minimum load value is in summer months of the year. It proves that the thermal load change is in the phase with the need in thermal load. Due to collector's tilt angles the load increases from minimum value in March and reaches the maximum value in July. It has been defines that for Almaty city (Kazakhstan) the annual optimal angle tilt of collector's configuration, which provides the maximum solar load share comprises about 45°.

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