Almost warm,lost all cold water and pump never stops during on time period
I bought this pump to avoid having to install an outlet under our sink. The install was hardly 15 minutes. Waiting for the water heater to cool down took longer than that, draining the water heater, etc. My problem with this product is that the pump never stops running except when the timer is in the off mode. Even when the thing is not running my wife still complains about warm water coming out the cold faucets. So I unplugged the pump to make sure it didn't run and still we had to wait for cold water. After reviewing the install instructions again I found a test to check if the valve is working correctly. It said to close the cold water shutoff valve and open the cold water faucet. If water comes out the cold faucet then it's working. NOT!!! That means when I want only cold water I'll get a mix of cold and warm...Hello, what's gonna stop water from entering my cold water pipes when I only want cold water? Obviously nothing and that's why we had no more cold water. I returned it and ended up getting one that closes the valve when it isn't being used. And I can change the temp. It was worth the extra money.

Product works great - a little difficut to set
I have been wanting to purchase one of these units for years but seemed to put if off because they are not cheap. I finally decided to purchase one and began checking out the different models available, decided on this pump and shopped around for price. Amazon had the best price, so I went ahead and made the purchase. It was not difficult at all to install and it works incredibly well, in fact it is amazing. Before I installed this product, we would honestly have to have the hot water in our bathroom running for probably three to four minutes before we got our hot water. Now, it's there within a few seconds. When I think of wasting that amount of water for the seven years we have lived in our home, I feel a bit ashamed. The only difference I notice is that you can hear a very faint swishing noise through the pipes when the pump is on. It's not a big deal and is worth the time wasted waiting for hot water and not wasting water any longer. The only complaint I have and actually, there is no practical way they could have engineered it any differently....is the fact that when you have to set the times on the dial for the operation, it's a little difficult because the timer is on the unit...which is installed on top of the water heater...which is up rather high...and the printing is rather small. Once it's set, you are not home free because if you have an electrical outage, you have to reset it unless you decide to have it run 24-7. I have ours set to come on about half an hour before showers start in the morning and shut off about bed time. Over all, I would not want to be without mine, thus a 5 star rating. Hope this helps....

Water savings
Drought declared in California and my first bill came back with a 39% decrease over last years usage.

Might work, but only if you don't have single handled faucets
We purchased this product to try to be more "green" about our water usage. While the product should be able to do what it states, it is going back tomorrow. After installing it, we were getting hot water in the cold water line (despite running the valve test they recommend in the manual). After waiting on hold for awhile, I reached someone who explained that if we had single handled faucets from any of a few manufactures the system would not work. They explained that these faucets would let water flow from the hot to the cold side when the pressure was raised on the hot water supply (which is how this system works). The only fix is to replace a part in the faucet (if available) or replace the faucet. Since this affects six faucets in our house that are too old to get new parts, we are done. I have no problem with this restriction, but it is not listed ANYWHERE, including their web site and instructions. Given that I now have a piece missing from my hot water supply line, it is a little late to tell me now. I give the product an `A' for what it will do, but I give the company an `F' for their documentation and lack of disclosure of a major problem. This is too major (and common) and issue to not tell people about up-front. I feel mislead by Watts.

Works very well!
No where in my house was I able to get hot or warm water without waiting a fair amount of time. After reading the reviews here I initially bought just the valve to see if it would work by itself as suggested in one of the reviews. It did not. Then I purchased the item described here, pump and valve, at Costco for $180. What a difference! Because of the layout of my house I needed 2 valves so my experiment with just a valve did not wast any money. The hot water at the valve could be hotter and the cold water could be colder - obviously mutually exclusive. The faucets upstream from the valve have much hotter water and this is an obvious but unexpected treat. It is nice to have something that works better than expected. I definitely recommend the Watts Premier Hot Water Recirculation Pump.