Oil Furnace Heated Water - Scalding Hot From Faucets!

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Hi everyone -  We purchased a foreclosure a month ago and just completed the rehab.  The last step was getting the oil  furnace repaired which is responsible for heating the hot water (coil).  This finally happened yesterday.  When I went to the property today to check things out, I turned on the kitchen sink to run the hot water and it was instantly like I was in a sauna! There was scalding hot water pouring from the tap and steaming up all around the sink!  

This is obviously a great concern for my tenants safety.  She is scheduled to move in next weekend and has 2 young children.  I did some investigation online and from what I read, there doesn't seem to be a way turn down the tap water temperature without it affecting the temp of the water feeding the radiators.  

Does anyone have experience or guidance on how to fix this potentially hazardous situation?  Thanks.