Air ends up in hydronic (hot water heating) systems in the following ways:
1. The system has just been installed or repaired, and it has been filled with fresh, air-laden water. Heating the water...
The one that is properly installed by a reliable, qualified contractor. Most systems carry the same warranty; 20years on the heat exchanger and 5 years on all other parts. Sure, there are low end...
With central heating, the heat is generated in one central place which is considered the furnace or boiler by energy sources such as electricity, gas, oil or solar energy and then distributed...