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IECC commercial domestic hot water pipe lengths
December 9, 2016
3:36 pm
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fgrable@iccsafe.org
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Your comment is understood however, ICC Staff is powerless to change anything. This is why there is a code development process. Everyone (eacept IECC Staff) continues to work on the codes to refine/update requirements. Offer a proposal to change the code in the next cycle. As this is the IECC, proposals will not be accepted until about October of 2018 (deadline of 1st week of January 2019).

November 17, 2016
7:39 pm
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chuck white
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Sorry - 2015 is correct (just came into effect in NY)

The reason is clear.

Installation awkward. (thinking aloud) A typical supply is about 2' AFF. With an 8' ceiling even with a 1/4" tube the recirc loop would need to come down the wall a bit.

November 14, 2016
9:54 am
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fgrable@iccsafe.org
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For everyone else's benefit, this discussion is about the the 2015 IECC (and now the 2018 IECC).

No, you are not incorrectly reading these sections.  The recirculation branch would need to be closer to the end of of the fixture supply (stop valve location) for public LAVs. That is the intent.

Think about this in the real world. How many times have you been in a public toilet facility and have not received tempered water at the LAV? Maybe even after a number of users have been using the LAVs, the water is still cold.  Remember that public LAVs are restricted to 0.5 gpm. It takes a fair of amount of closely timed uses to clear a fixture supply pipe of cool/cold water. 

November 10, 2016
7:35 pm
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chuck white
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Referring to 404.5.1 & 404.5.2 - max domestic hot water pipe length

Is it me or is this exceedingly hard to accomplish?

6 feet would not even get you up to the ceiling. It would require individual recirc branches to the fixtures? Am I missing something?