Air Trapped In Radiant Floor

Air trapped within a closed radiant system is the most common cause of inefficient system performance.

Air trapped in radiant floor.

Central heating systems use either a furnace with hot air ducts or a boiler with hot water hydronic pipes and radiators including radiant under floor heat. It is a closed loop system where air is moved through either 2 or 4 inch pvc tubes which are non corrosive so that no dust from the air in the home is introduced into the system. Thus creating a vacuum this will suck air into the system. You will need one or two wall mounted fan coils in order to keep the humidity low enough so that no condensation occurs on the floor air dew point floor temp.

When water is heated in a hydronic heating system also known as a hot water heating system dissolved air is driven out. Air is the worst thing that can happen to any hydronic radiant heating system. If pressure is dropping below the 15 psi it is an indication of air still trapped in your system. But much of the sensible cooling will be done by the radiant floor.

Fortunately it s an easy problem to solve and won t become an issue at all if care is taken during the initial filling process. Eventually this air can become trapped in the hot water lines. Legalett air heated radiant floor heating systems are entirely embedded in concrete including the heater box. In the summer it can also be used to cool the floor.