Nothing contained in Title 38.2 shall be construed as prohibiting the performance of any contract made for the introduction of automatic sprinklers for reducing the risk by fire on any property located in this Commonwealth and containing provisions for obtaining or guaranteeing insurance against loss or damage by fire or water for a specified time at a fixed rate; provided, that all insurance contracts issued as a result of such contracts shall be in the form required by law in this Commonwealth; provided, further, that the contract rate be less than the published rate on risks covered thereby or the rate used by insurance companies writing such risks.