Why you need to balance radiant manifolds.

Balancing a manifold allows the radiant heating and/or cooling system to properly regulate the flow of water. Taking just two minutes to adjust the flow on each loop allows the system to operate efficiently.


How to balance a radiant manifold from Uponor.

It takes 6 steps in just 2 minutes. Now, let’s get started. To balance the manifold assembly, follow the directions below.


1. On the manifold to be balanced, find the loop with the highest pressure drop (ft/hd). This loop does not need any balancing, and will be fully open (4.25 turns from closed position).


2. To balance all other loops on the manifold, find the pressure drop (ft/hd) for each loop and subtract from the loop with the highest pressure drop (same as the loop figured in step 1). The difference is the delta ft/hd. Use this number on the balancing chart below to find the required number of balancing turns.


3. Locate the delta ft/hd number on the vertical scale located on the left side of the balancing chart below.


4. Locate the gallons per minute (gpm) on the horizontal scale at the bottom of the balancing chart.


5. Locate where the delta ft/hd and gpm intersect on the chart.


6. The closest diagonal line to this intersection repreĀ­sents the number of full valve turns from closed to open to accurately balance the loop. If the intersection falls between two diagonal lines, estimate the distance between the lines and adjust the turns accordingly.


If you’re a visual learner, watch the video below to see how to balance an Uponor engineered polymer (EP) manifold for residential radiant heating or commercial radiant heating and cooling applications.