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Hi, It's clear that the temperature and pressure relief has been leaking also. Put a little bucket under it to catch any drips and see if that lets the floor dry. If it doesn't change things, the tank, or fittings on the tank are seeping as well.

Yours, Larry

  @Pico, The yearly boiler maintenance schedule I have attached, assuming you have a Frontier boiler. The boiler maintenance is just that, a maintenance on the burner and checking the boiler safeties. A system maintenance may be requested as its more involved, purging of zones if needed. Checking thermostat batteries ect. And further yet a hot water storage tank maintenance may include anode rod inspection , draining and flushing the tank, thermostat calibration , testing of safeties etc. Water quality in your area will affect how in depth and how frequently these procedures will be needed.  All of  the above procedures may or may not be included in your “Yearly” maintenance. All service companies are competing for your business and may advertise lower yearly tune up prices. But obviously time is money and all of the above listed may not be performed based on price vs time restraints. Best bet is to ask the company on the phone prior to the techs dispatch , what they will be checking and testing. Request add on's at this time so when the technician arrives everyone is on the same page as to expectations.