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Old 01-04-2017, 03:47 PM   #1
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Two shower heads, 1/2 pipe...


Hi all,

I've done quite a bit of Googling on this topic but I want to hear from this group.

I'm about to gut our master bath, where we have a standard shower with 1/2 pipe. I want to build a walk-in shower with two showerheads, and I'm obviously worried about the pressure if both showerheads are in use at the same time.

I don't have a way to run 3/4" pipe from the basement up to this bathroom, so I'm stuck using the 1/2" supply. Are there any options for me to boost pressure in the bathroom during this remodel? Any special values to use to help in a situation like this?

Thank you in advance!
Shane
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Old 01-04-2017, 04:24 PM   #2
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Re: Two shower heads, 1/2 pipe...


With todays restrictive shower heads, normal 40+ water pressure, you'll be fine.....

plus, you both will be under the same shower head in no time..
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Old 01-04-2017, 04:28 PM   #3
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Re: Two shower heads, 1/2 pipe...


I would add a valve so you can limit which shower head or both can be turned on at a time. Maybe a three way valve.
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Old 01-04-2017, 04:45 PM   #4
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Re: Two shower heads, 1/2 pipe...


Just adding that the diverter valve would be if you want them both to run on the same shower valve. If you want separate temperature controls, then you'd have 2 shower valves and no diverter valve.
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Old 01-04-2017, 05:03 PM   #5
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Re: Two shower heads, 1/2 pipe...


3/4" would have twice the flow of a 1/2" pipe.
Low flow, less pressure.
No way to run a a 3/4" line! Why?
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Old 01-05-2017, 07:25 AM   #6
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Re: Two shower heads, 1/2 pipe...


Quote:
Originally Posted by joecaption View Post
3/4" would have twice the flow of a 1/2" pipe.
Low flow, less pressure.
No way to run a a 3/4" line! Why?
Well, I don't have a straight shot to the basement...fire stops between floors + finished basement make it very tough. I don't think it's worth cutting into finished walls in order to get it done, as much as I would like to....
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Old 01-05-2017, 08:43 AM   #7
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Re: Two shower heads, 1/2 pipe...


Don't worry as much about cutting into finished walls, at least if you're just talking drywall. The skill-set to repair them isn't hard and if you don't want to spend time on wall-repair or are bad at it, there are a lot of people around who can do a serviceable job.

If you're talking a plaster wall or having to re-do the tiling, obviously, it starts getting more involved for a newbie.
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Old 01-05-2017, 04:47 PM   #8
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Re: Two shower heads, 1/2 pipe...


1/2 pex is good for probably 3.5gpm. Let's say you are running 80% hot water at 2x2.5gpm. So your hot demand is around 4gpm and supply is around 3.5.

You'll have less than full pressure but still much more water than a single valve. It'll make a difference how hot of showers you tend to take. The cooler the shower, the more pressure you'll have.

As was suggested earlier it'd be advisable to have a diverter valve or 2nd shower valve rather than just plumbing 2 heads off one valve. That'd give you an option to have full pressure. That can even be done very simply by threading a valve in-line on the shower arm of one or both heads. Or can be done more fancy with a 3 setting diverter that matches your shower trim.
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