Williamson 125k btu boiler has wires under it

@mattmia2 said: "some boilers can be open like that, others need the bottom sealed off by the floor to draft properly."

A believe that boiler is not supposed to be raised up on blocks like that. The proper way to raise that up is to make a solid base that is the full dimension of the boiler jacket

This illustration of a top view looking down on the block base indicates that your 2 block base on the left is incorrect and the proper base is to use a solid base as shown on the right.

Regarding the wires in the photo; there is combustion air (that has oxygen in it so the fire has enough oxygen to burn properly) coming from under the burners.  That basement air is a lot colder than the flame you see in the photo.   So the air around those two wires and the aluminum pipe that is feeding the pilot burner with gas is the same temperature air that is on the floor about 2 feet away from your boiler.  And I don't believe that air is hot enough to melt your shoes when standing next to your boiler. 

The cold basement air rolls across the floor under the boiler and goes up past those wires keeping them from melting.  That air then mixes with the gas and makes a flame.  The heat from that flame continues to travel upwards thru the boiler to make the metal hot.  That hot metal transfers that heat to the water inside the boiler. There is a circulator pump that moves that hot water to the radiators and returns the colder radiator water to the boiler to heat it up again.  

It is all a vicious cycle that goes on and on that is keeping you comfortable. So don't worry about that wire, the manufacturer put it there on purpose.

Enjoy your warm home.  

Mr. Ed.