Boilers are special-purpose water heaters. While furnaces carry heat in warm air, boiler systems distribute the heat in hot water, which gives up heat as it passes through radiators or other devices in rooms throughout the house. The cooler water then returns to the boiler to be reheated. Hot water systems are often called hydronic systems. Residential boilers generally use natural gas or heating oil for fuel.
Boilers, are much less common in homes today, but still prevalent in older homes and is a preference of the house owner.
The signs of a failing boiler is very similar to a furnace. If you find yourself calling in for this service a few times a year, and your boiler is getting old, then it’s probably a better economical choice to look into replacement rather than investing in yet another repair.
Boiler performance and life span can be maximized by maintenace.