The Importance of Filling and Draining a Hydronic Heating System

Use a boiler drain in a hydronic heating system for filling and purging water and air from the system. These are removed to make the hydronic heating system operate correctly. Water is filled through the system in one way, flowing through the piping and out of the system carrying air with it.

Easy to Use

When the hydronic heating system is plumbed properly, it works efficiently and makes it easy to add water and remove air. Ensure that the system is well plumbed and inspect it regularly. This makes it effective during the initial filling and draining, and consequent servicing also goes on without problems.

Enhances Mechanical Operations

Air is removed from a hydronic heating system to make it perform mechanically correct. Build up of air can bring about noises in the system. Accumulation of large amounts of air can affect the operations of the circulator pumps. If left unchecked, this might interfere with the heating loop and result in a lack of heat.

Maintenance of Required Pressure

There are benefits associated with having correct amounts of pressure in the system. Filling and draining the system helps to get the correct pressure at the fill point. This pressure must be high enough to push the fluid to the top of the system. It also helps to maintain correct pressure according to NPSH requirements of circulation pumps. This prevents cavitations in control valves.

Filling and purging helps to maintain the system above atmospheric pressure which prevents ingestion of air. This allows air venting devices to work optimally, which improves the operation of the system.

Hydronic Balancing

One of the benefits of purging and filling the system is that it enhances hydronic balancing. This enhances balanced flow of energy through the distribution system. If the heating appliance is not able to regulate flow rate as a result of poor hydronic balance, water will follow unregulated paths resulting to distribution of wide variations of temperature throughout the system.

Poor Heat Distribution

Another sign of poor hydronic balancing is whereby the heating system produces too much or insufficient heat in the home. In some cases, room temperature can fluctuate continuously. This can be avoided by maintaining the system in good condition such as filling and draining services. This happens when water flows back to the boiler using the shortest path possible, without completing its required flow path. The condition brings about more flow to the radiators closest to circulation pumps. This prevents the heating appliance from distributing heat evenly across different points in the home.

Loss of Energy

Fluctuating temperatures in the home is a common phenomenon if a hydronic heating system does not function as it is needed. If this happens over time, it results to energy losses which can be expensive to home owners. Draining and filling the system improves its efficiency and operations, it can help to resolve such problems. If the problem is not corrected, it can lead to increases in energy costs exceeding 40 percent.