What is the best length for the radiant tubing loops?
A. The absolute maximum loop length for 1/2″ tubing due to pressure loss from friction is 400′, but we don’t recommend loop lengths over 300′. For optimum performance, keep your radiant loops short. Shorter loop lengths work much better because they provide less temperature drop in the loop. Hot-spots and Cold-Spots become very noticeable with longer loop lengths. We stock BPex in 300′ and 500′ coils that can be cut to the exact length for shorter loops. 300′ coils work great for 290′ loops with a 10′ leader, or (2) 140′ loops. 500′ coils work great for (2) 240′ loops with 10′ leaders.
