1

I am installing a new bathtub that is big enough for two people. with one person leaning against each end of the tub. So I want to have the shower head in the usual position at the end of the tub, but the tub-filling spout in the center of the long side of the tub.

I'm thinking I can I just use one valve/faucet set with a diverter, like the usual setup. I'm thinking the valve/faucet should be closer to the spout. So then, the only difference (than the usual arrangement) is that the pipe from the valve to the shower will be quite a bit longer. The issue is, would the pressure drop to the shower head be such that the flow is too low ? If I understand, shower flow is limited mostly by the shower head, so if I installed a high-flow shower head, maybe I'd be ok.

But if not, if the shower flow would be too low that way, I'd consider installing two completely separate valves/faucets, one for the shower and one for the tub spout. It'd cost a bit more, but it wouldn't be that much trouble, because there are already pipes coming up along the long side of the tub, because the washing machine is on the other side of the wall.

  • 1
    Make life simple... Use two different supplies with regular independent valves on each side. If you've gotten to the point in the relationship where sharing a shower head is no longer cute then sharing someone's temperature preference is also around the corner. Soon to follow will be taking showers at the same time altogether so maybe just stick with a standard setup. :) – OrganicLawnDIY Feb 26 '15 at 2:07
  • I am only talking about one shower head. But the idea is to have the shower head at the end, as usual, but the tub spout along the long side of the tub. So I'd only be using one at a time. – RustyShackleford Feb 27 '15 at 4:57
  • oh I see now. 2 people taking a bath together not showering together. You don't want the spout to be in someone's back. I think 2 valves is the better way to go since you already have the plumbing on the other side of the wall. Easier to run the plumbing that way instead of having to go around the wall and corner. Also easier to repair if something goes wrong in the future. Shower only on one side tub only on long wall. Just my opinion. – OrganicLawnDIY Feb 27 '15 at 5:28
  • Yeah, couples shower is in the other bathroom. Two valves is a bit more expensive, but I think it IS better. – RustyShackleford Feb 27 '15 at 20:07
  • Have you asked John Redcorn what he would prefer? – OrganicLawnDIY Feb 27 '15 at 21:32
3

Hardly any noticeable difference; though a "high flow" showerhead would make any difference WORSE, not better, as well as increasing your water use needlessly.

The water is already traveling through many feet of pipe to get to the bathroom. Whether there's 4 more feet of pipe to the showerhead or 9 more feet of pipe to the showerhead makes very little difference, particularly at the typical 2.5 GPM flow. At a more efficient 1.5 GPM flow, even less.

4 feet of 1/2" plastic pipe @2.5 gpm = 0.625 feet added head. (0.27 PSI)

9 feet of 1/2" plastic pipe @2.5 gpm = 1.406 feet added head. (0.61 PSI)

4 feet of 1/2" plastic pipe @1.5 gpm = 0.243 feet added head. (0.11 PSI)

9 feet of 1/2" plastic pipe @1.5 gpm = 0.547 feet added head. (0.23 PSI)

There's also no particular reason to put the valve set closer to the spout - so you could just put the longer pipe on the spout, and take advantage of the pipes in the shower wall.

  • Thanks, I figured there was a calculator like that somewhere. I want to allow for 3gpm, and I've also got to add the elbows (between a faucet set mounted near the spout and the shower head), 3 of 'em I guess. Still I'm talking maybe 2-3 psi total, not much. – RustyShackleford Feb 27 '15 at 5:07
  • I also have to get around the corner (between the long side of the tub and the end) and the way the corner in the stud wall is framed, I can't get an elbow fitting in there, and the minimum bending radius for 1/2" PEX is 5". So that could be a problem, it seems like. – RustyShackleford Feb 27 '15 at 5:09
  • You should not need 3 elbows if you are using PEX. As for the corner, you can often improve the path by offsetting it vertically - rather than "going around the corner flat" go around the corner while ALSO going down toward the spout, (or up towards the showerhead) angling down from one side and up from the other, meeting in the middle. – Ecnerwal Feb 27 '15 at 5:35
  • Thanks, Lawrence. That makes sense. But I'm starting to think the whole thing, of a person leaning against each end of the tub, is a red herring anyhow. The drain end of the sub is very steep-walled; probably not comfy even with a tub spout in your back. – RustyShackleford Feb 27 '15 at 20:05

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.