With 3/4″ tubing either a 12″ or an 18″ spacing is used, depending on the climate and the desired temperature for the space.
For large shops and large commercial buildings (usually over 5,000 square feet) 3/4″ oxygen tubing is standard. With 5/8″ tubing a 9″ to 12″ pattern is standard. For most large shops and small commercial applications 5/8″ oxygen barrier PEX or InfloorPERT® tubing is typically used.
With 1/2″ tubing, a 6″ pattern is sometimes used in smaller spaces, such as bathrooms, and for extreme cold climates, while 8″ and 9″ patterns are standard for most living areas in most climates, and a 12″ pattern is used in garages. For example, by increasing the flow through 1/2″ PEX tubing by only 0.1 GPM, floor output will increase at 5 BTU/sq. To increase the floor output for selected tubing size and length, the flow may need to be increased, the tubing spacing may be closer together, or an increase in water temperature. The later is especially important, since heat loss calculations is the initial stage of every radiant heating project and allows the installer to determine which tubing size to use and how long the maximum length would be. We generally recommend 5/8″ and 3/4″ tubing for large commercial and snowmelt applications.įactors such as tubing size, tube spacing, and water temperature directly represent the heat output (in BTH/sq.
The tube size dictates the flow rate that can be achieved and also indicates the maximum loop length based on the head pressure. Generally, for a residential Infloor Heating System® we recommend 3/8″ and 1/2″ tubing. PEX and PERT tubing come in several different sizes. With five sizes available, how do you know which one is best for your project? These general rules can help. These tubes provide excellent performance in radiant applications and provide the system designer with the greatest options for component selection. We offer the best PEX and PERT tubing for our hydronic systems, available in a variety of sizes, ranging from 3/8″ to 1″. Like veins, it transports warm fluid, and the heat output, throughout your floors, turning them into comfortable, warm surfaces.
Tubing is an essential part of every hydronic radiant heating system. How to Determine the Correct Tube Size and Spacing for Your Project
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