HET Retrofit

I think retrofit kits would be accepted, but if the bowl is not designed to flush well with 1.28 gpf, you may end up with performance issues leading to people double flushing. I'm not sure how the LEED Reviewer would view that likely potential for double flushing, but I would imagine the owner/occupants would likely not be happy with it... If, however, you can show that your bowl was designed for 1.28 gpf but that a 1.6 gpf flushometer was originally installed, then sure you could retrofit and I think the LEED Reviewer would accept it without a problem. (Maybe include some photos of the retrofit being installed to show it was really done...)

Hi Matthew, 1.28 gpf retrofit kits are perfectly acceptable. To demonstrate compliance, you need only provide a plumbing fixture schedule or cut sheet showing the flush rate. So, from that vantage point you're fine. But, as Michelle noted, there may be maintenance concerns with utilizing the retrofit kit as it may lead to performance issues or leaks. In this circumstance, you need to weigh the potential water savings versus the long-term maintenance to determine what the optimal solution would be.