Ensuring the burners and heat exchangers are in good working order is essential for the safe and efficient operation of your boilers. Over time, products of combustion can build up, obstructing burner ports, the exchanger, and venting. Something else to keep in mind is the quality of the water/glycol in your heating system. If left unchecked, the water may become acidic or turn into sludge which can lead to catastrophic circumstances for your entire heating system.