Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: If the pump is on, and the water is hot, the sensor valve closes, right?  Isn't the pump trying to push water against a totally closed line?
Document: Next morning, I had hot water in my shower in seconds, today was the second day, again hot water right away. The only thing I can figure out is the pump pumps hot water into the hot water line, when it reaches the far side of my house, the upstairs toilet, it goes into this plastic valve and returns to the hot water through the cold water line.
I agree with most of the positive comments already provided but did want to provide on additional tidbit that we discoverd.As you can read the way this pump works is to move water from your hot water angle stop under your sink through their valve to the cold water supply (also under your sink). We noticed right away that our cold water is now warm to lukewarm because of the amount of hot water present in the cold water line.
Total.Now I'm all in favor of doing what's right for the environment... but it just doesn't make sense to spend $200, plus another $35 every year or two to replace the sensor valve (which apparently only lasts a year or two before it needs replacing) - all so that I can save $12 per year on water.
The comfort of having instant hot water is it's most excellent feature. The water saved is a big benefit too, I'm sure. Of note, the system does not constantly circulate hot water through the cold water line as I had feared. Once temperature is reached the valve closes. I have not found any problems getting cold water from my cold water faucet. An excellent, system with easy installation. I only wish that I had ordered the extra valve for my kitchen along with my original order to save shipping charges.
The "sensor valve" turns on, the water flows noiselessly, and when the water is hot at the faucet, the water flow stops. Where does the "not-hot" water go? It flows back down the cold water line, and into your home's cold water plumbing. As the water at the faucet warms up, a sizable amount of lukewarm water flows into the cold water plumbing.
I installed the system two days ago and so far the results are great. I went from getting hot water in 1 minute to having hot water in 2 seconds at my kitchen sink. I need to install the additional sensor valves to get hot water at other locations.Installation took about 20 minutes, porbably could have been faster if I was trying. I only needed 1 wrench to do the entire install, though a second smaller wrench would have been easier.
Since the hot water pressure is now slightly higher due to the pump, the mixing values lets the cold "hot water" flow until the hot water arrives. When the hot water arrives at the faucet, the valve closes. Hot water cools, the valve opens again. So yes, you will have hot water at that faucet, but a constant trickle of hot water is required from your hot water heater to make this happen.
The Watts hot water recirculation pump and the under sink valve installed easily. The timer is great, can set it in 15 min intervals. Only thing strange is that when the pump is running the cold water nearest the valve gets warm. No big deal, yet it takes 2 to 3 adjustments to get the shower right.All the components are high quality.
The plumber installed the same Watt's elsewhere just 2 days ago, he said we need to install the Watt's Sensor Valve Kit For Hot Water Recirculating Pump (0955801) under the furtherest sink.
I installed only the sensor valve, no pump, at the end of my water run. It works just fine. Hot water in seconds rather the about a minute. It improved hot water speed at all faucets. Most of my taps are single handle and are from two manufacturers and they all work fine.
Answer: yes