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A lot of routing protocols have been developed for Wireless sensor networks. Most of them considered the homogeneous network scenario where each node have same capability in terms of processing power, storage, energy etc. In the real scenario, nodes have different values of processing time, storage and energy. Therefore, it is essential to judge the performance of the well accepted routing protocols for heterogeneous wireless sensor networks (H-WSN). Nodes in WSN are dispersed in two ways viz advanced nodes (high energy) and normal nodes. A sensor network works until the nodes do not drain their batteries. Further, it is very difficult to replenish the batteries of the nodes, once they are being deployed to some hostile environment. In this paper, three well accepted WSN routing protocols namely LEACH, FAIR and SEP have been benchmarked for their energy pattern in heterogeneous scenario …