Minimum procedure for sterilizing mason jars for canning
Washing them in hot water is most certainly not enough. Sterilization via boiling under pressure is guaranteed to kill every harmful pathogen, particularly Clostridium botulinum, the beastie responsible for botulism. The "hot" water from your tap is not enough to kill the spores. C botulinum spores must be heated to 250 F for at least three minutes to guarantee they are killed.

Please do not compromise here under any circumstance. Canning requires sterilization, not sanitization. Botulism can paralyze and kill you.