Thus, hot water boilers are the most important component of hydronic
systems. They can be either gas-fired (using natural gas or propane) or
oil-fired (using liquid fuel). The advantage of gas-fired boilers over
their fuel-burning counterparts is that they require comparatively less
attention and maintenance. Gas-fired boilers are reliable and the only
problem they may pose is with their expansion tank or circulator pumps.
The main elements of a hot water boiler are aquastat, burners/valves, temperature and pressure monitor, air vent, expansion tank,flow  monitor, circulator, drain valve and pressure relief valve. The function and importance of each element is:
? The aquastat is a temperature regulation system. The relief valves alleviates water pressure when it increases within the system.
? The circulator is a pump that automatically circulates water through the system.
? The drain valve allows opening and draining of the main water boiler.
The hot water boiler is a fairly complex system as it has many
? Burners, in case of oil-fired systems, and valves, in case of gas-fired ones, are used as the essential combustion assembly.
? Temperature and pressure monitors regulate the water temperature and pressure.
? The flow monitor is a valve that controls water flow to the boiler and hot water to the piping system.

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