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CalGreen Shower Restrictions - Need Diverter Advice

Posted by montel (My Page) on
Tue, Jun 28, 11 at 13:03

So in California for 2011 we now have to follow new CalGreen water conservation rules shown below:

4.303.2 Multiple showerheads serving one shower. When single shower fixtures are served by more than one showerhead, the combined flow rate of all the showerheads shall not exceed the maximum flow rates specified in the 20 percent reduction column contained in Table 4.303.2 (2.2 gpm) or the shower shall be designed to only allow one showerhead to be in operation at a time.

Exception: The maximum flow rate for showerheads when using the calculation method specified in Section 4.303.1, Item 2, is 2.5 gpm @ 80 psi.


Our Problem is that we have a 2 person shower in our master bath - it is a very large shower designed for 2 users at a time. However, strict reading of the rules means we could only have two 1.1 gpm heads on at one time or just one single 2.2-2.5 gpm showerhead period!

We would like to have at least two controlled shower-heads - Our town is pretty strict though. I have seen one web posting about San Francisco allowing two 2.2 gpm heads if it is multi-person shower, and the heads are controlled by dedicated valves.

We would really like an overhead rain shower and two heads on the wall but can't find diverters that control 1,2,3 outputs independently...

Delta has a diverter that does output to 1, 1&2, or 2 - this wouldn't work for us...

Follow-Up Postings:

RE: CalGreen Shower Restrictions - Need Diverter Advice

Anyone have ideas?

RE: CalGreen Shower Restrictions - Need Diverter Advice

Vote differently? It is what it is until you force a change. Sorry

RE: CalGreen Shower Restrictions - Need Diverter Advice

The solution is simple, Put separate controls on each end of the shower enclosure, which would then define it as two showers in a common enclosure. The only caveate is that you would then have to compute the drain load as two showers or 4dfu's instead of 2.

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