Delta R10000-unws valve e/w dual function themo cartridge: Good day, can someone please tell me what the minimum riser height I can use with this valve and having the top output port (shower head) connected to a hand held shower elbow and the lower port to the tub spout. House pressure is 45 PSI at 5300 ft AMSL, 1/2" CP and both output venturi holes seem to be the same shape and diameter. Delta installation specs don't list a requirement. I am in the plumbing design stage of my project. Thanks Ron

Further to this question, is there a general rule for min - max distances for shower/tub mixer to the shower head and tub spout?

I am having an issue with my diverter and believe its because my shower riser height is too short.

Also is there a way that you can "artificially" increase the riser height without shifting the location of the shower head or mixer? Like adding more pipe?

There are only suggested heights / locations for installation of your spout, valve and / or shower outlet.

We usually install spout 6" about the rim of the tub, shower valve about 8" above the spout, and fixed shower head about 82" above the floor.

In case of hand held outlet ( wall union ), its location differs from customer to customer. It can be placed just about anyplace in your shower. We usually install it to the side of the shower valve.

I was able to get an answer to my own question. Delta Engineers say that one can set the shower riser height to what ever the customer wants it to be. The only distance restrictions are for the tub spout. This distance must be at least (Minimum) of 8" below the control valve centerline.

This will put my question to bed... Thanks

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I was able to get an answer to my own question. Delta Engineers say that one can set the shower riser height to what ever the customer wants it to be.

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Now that's interesting. Not going to let the "Delta Engineers" install any of my showers. There are three reasons that shower heads leak. 1) a faulty diverter, 2) Excessive house pressure and 3) Too short a shower raiser
And no, you can't,

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"artificially" increase the riser height without shifting the location of the shower head or mixer by adding more bends and pipe?

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The head pressure remains the same if the height remains the same. The Delta guys gave you bad advice. We install our shower heads at 79 inches and our raisers at about 27 inches. Good luck, Tom

I'd go with Tom's 79". Even if you have a family of short folks like me a standard height of 79" will appeal to the next owner, it's a safe bet.

Thanks so much for the responses. So final Qs: is the 79 inches and 29 inches measured from the floor? And is the "riser" the mixer/valve?

Not finished height of your shower head: If you install shower head at 79" than the finished height will be about 75-76". (shower arm is bent + size of the head itself).

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So final Qs: is the 79 inches and 29 inches measured from the floor? And is the "riser" the mixer/valve?

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We position our shower head outlet 79" from the floor. We position our tub spouts 4 inches above the lip of the tub and our mixing valves from 4 to 6 inches above the tub spout. The shower raiser is the pipe that goes up from the mixing valve to the shower head. Good luck, Tom

I guess I need to quantify my own answer, as I have finished my bathroom and my orig question was to find this height so I could use a hand shower vice a normal shower head at about 79" aff. I have no separate (stand alone) diverter valve and just use the reg spout pull down. I mounted my hand shower OP at 11" above the control valve and everything is A OK. I guess if my spout diverter starts to leak, I'm going to just replace it or install a small shut off valve. I think the Delta people are not considering the spout's diverter function going bad! Thanks for all the IP

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I guess if my spout diverter starts to leak, I'm going to just replace it or install a small shut off valve. I think the Delta people are not considering the spout's diverter function going bad!

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It's not the diverter that will leak if the shower raiser's too short but the shower head. Do you have a shower head installed in addition to the hand held shower? Back to you, Tom

Do you have a shower head installed in addition to the hand held shower? Back to you, Tom

Well Tom, sorry for the late answer. I only have the hand held shower, with its OP located 11" above and 10" to the right of the Delta control/mix valve. The Hand shower head is connected to the OP elbow via a 60" hose. The hand held is mounted about 2" above the OP elbow. So were looking at a total of 24" above top finished tub (spout 3" above tub). What I meant by "leak" was not an external water leak, but rather an internal by-pass leak, which would cause the shower head to dribble water. According to Delta, they engineered the fixture's venturis to allow this type of function. Anyway, I'm not going to tear into the wall and run copper up to 79" AFF and back down to 39" AFF to fix a virtual problem. Works good, hope it lasts a long time. This was an 8 Month project.
Ron

Good job! I realize we were all figuring on a regular shower head. Sorry for the confusion. Sounds like you're good to go, Tom

In this situation it is the best to use "rail" that will hold hand-held shower. Rails are 24", 30", or 36" tall. With rail, you can slide your shower head up and down as you please. This is especially good set up for family that has tall and small members.