Circuits & Loops

Circuits or loops are one continious piece of tubing attached to the supply outlet and return outlet of a manifold. Depending upon the tubing size - diameter (nominal) a maximum circuit length is established. Exceeding these recommended lengths may cause system failures. For example: 1/2" oxygen barrier PEX tubing is recommended to not exceed 400 lineal feet.

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Fact or Fiction

Half inch PEX must not exceed 300 lineal feet....FALSE. You may run up to 400 lineal feet or less. Keeping the PEX to the shorter length of 300 lineal feet will reduce pump head pressure and may keep the pump size smaller. Going over 400 lineal feet will cause two issues: increased head pressure (possible system failure) and reduced residual heat at the end of the circuit length such that the initial supply water temperature may need to be raised. Raising the supply water temperature costs more money. Bottom line, if you do not understand system design using 1/2" PEX stick to 300' as your maximum length.

Selection Information Chart

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Input Your Choice

Input your selected choice of tubing size by review of all related criteria. Input the total square footage of area to be covered and you will have an approximate total length of tubing needed.

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