Evolve EV1003CP-SB ShowerStart Thermostatic Shut-off Valve in Chrome Finish, Water- and Energy-Saving Valve for Most Bathroom Fixtures, Not Low Flow, Uniform Plumbing Code Certified, 1-Pack

This works as advertised. Water gets hot then the flow drops to a trickle - water is hot when you actually get in the shower. This is a water and money saver... and reduces damage from turning you bathroom into a sauna.

First thing to know: No, these valves do NOT last forever. I tend to have to replace them every 5 or 6 years. It probably depends on the type of water you've got and how much you use them. One of these days, I'll do a deep dive on trying to rehabilitate a dying valve (soak in a descaler like CLR, clean the inlet screen, ...?). In the meantime, it bothers me to waste water and energy by running the hot water past the point where it's reached the shower.I've seen some people's reviews complaining that these valves aren't made well anymore. Perhaps? I see that this Amazon seller (ShowerStart) is offering two models: One ("Chrome Polish") looks like it might be made of plastic, and costs about 20% less than the one that I bought ("Brushed Nickel"), which is definitely mostly metal. That's the version I've always bought, and it lasts years, in our home.In terms of finances -- no, the savings in water/energy probably won't recoup the cost of the valve. I buy it because wasting the water and energy just bothers me too much. But I live in SoCal, where water and energy are often constrained resources.

I love this idea: You turn on your water and, once it gets hot, this device is supposed to shut off the water, until you pull the cord. If your water can take a while to heat up, and you don't want to stand around constantly checking it, this can not only reduce water usage and costs, but also "notify" you once the water is hot.In practice, I found this to be a bit flaky. It works best when you heat up the water all the way—but that also means you'll need to adjust the temperature back before jumping in. In addition, the device feels like a cheaper material, and I will be curious to see if it ends up springing a leak with constant use. That said, it is pretty noninvasive, and really nice when it does work.Currently, my local utility in Seattle offers is offering a rebate on these which effectively makes them free. For that price, they're well worth the experiment.If you're like me, you will probably fuss over the design of the pull cord. Fortunately, it's a completely detachable element, which isn't obvious in the photos. If you are tall or have a low showerhead, you can just remove it entirely, and pull down on the lever directly. Otherwise, you can easily replace this with any cord of your choosing. I used a chain, but you could get creative here and use e.g., a thin piece of rope with an ornament hanging off the end, or something like that.

Bought as a replacement because we loved the old one so much. It does a fantastic job running until the water is hot then pausing. Saved a lot of water. Needed a replacement because we over tightened the last one with tools. Hand tighten only!

I had one of the original ShowerStart TSVs back in 2017. It was a metal component, well made, and still works great. I bought some of the newer ones, thinking they'd be equivalent quality.They are not. They have all either failed within a year of installing, or failed IMMEDIATELY upon installing. Leaks out the back, threads just stripping and dropping a showerhead off, cracks appearing at the mold seams.The product is still a great idea, they just got too cheap with the manufacturing. Go back to metal construction, and I'll buy another

We installed Evolve shut-off valves in our last house, and was very pleased with their performance. Unfortunately, the new ones we got for the new place are cheap, plastic units that have been problematic. We purchased 3, and at first, I couldn't get any of them to work in our showers. I bought a pressure gauge, and that was not the problem. I sent a message to the company and got no response. It turned out that they are very sensitive to any additional pipe to the shower head. I had installed it a few inches back from the head, and it never shutoff. However, I discovered that placing it directly at the head got it to work. Not ideal since the string end up behind the head, hanging against it. Even with this, one of the units never worked. I had to get a replacement from Amazon, which is now working.This was disappointing, particularly when our past experiences were very good. I think it's a great idea, but the current execution leaves much to be desired. And customer service is non-existent. Buyer beware.

Work as intended, no issues, saving water and reducing my bill

I originally got this water saver valve thru ComEd but they don't sell them anymore. The purpose of this is to run the shower to get the hot water going and then the water saver valve shuts it down until you pull the cord to get the water running again.However, after constant use, the spring in the handle doesn't pop back to cut off the flow of hot water and the shower just keeps running. Hence I was looking for a replacement. I was very happy when I found an exact replacement on Amazon.