The Hydronic System - Expansion Packs and Other Valves


Hello dear plumbing team, 

In today's post we will cover two additional elements that are added to a hydronic heating systems. 

In the previous post we covered a few of the basic elements of a hydronic heating system. These elements include the boiler/heat source, the temperature limiting controller, the room thermostat, the circulator, the heat emitter, and the distribution piping. In today's heating system, all of these elements are part of a closed system. We also learned how the temperature limiting controller and the thermostat work as a stop and go light for the circulator and heat source to produce the necessary heat that the building requires. 

In today's post we will cover about two additional elements. The first one is an expansion tank. This tank is added to hydronic heating systems to account for the fact that water expands when it is heated. The expanded water goes into the expansion tank which has air inside. The air gets compressed as the water comes inside of the tank. When the water cools down, it's volume goes down, and the expansion tank goes back to its pre-expansion levels.

A second element to cover is pressure relief valves. If a heat source reaches the upper temperature limit and the system's controller systems is unable to turn off the heat source, the results can be very serious. For this reason, hydronic systems also come equipped many times with a pressure-relief valve that makes sure that the pressure that is building in the system due to the ever hotter water does not reach to a point of causing harm to people and to the property. 

Hydronic heating is our specialty! Gives us a call. 

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