So what this does is move the hot water through the pipes constantly, not just when you need it? Seems like an energy suck. Is it?

If you run this all the time you will likely increase your water heating costs significantly as you are turning your pipes into a big radiant heater. You can use the built in timer to only have it come on at set periods, but this will only work if you have a very fixed schedule. I attacked this another way. I plugged the unit into a TP-Link HS110 Smart plug that is Alexa controlled. I can just say turn on hot water pump or turn off hot water pump when I want to control it. But that was not good enough for me. I found that if this pump ran for four minutes it would give me hot water at the distant shower that I wanted, so I did the following. I wrote a routine to turn on the pump, wait four minutes and then turn it off. While I can run this by voice, I bought the new Amazon Alexa Button, they are about $14 for a two pack. The button is battery operated and communicates to another Alexa device. Just before I take a shower I push the button and within four minutes the water will be hot without having to run water.

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?

The pump just stirs water in the pump housing. It's not a positive displacement pump, so it has no problem doing that. But most of the time the control valve allows a trickle of hot water to flow, just enough to keep the faucet temperature at a constant 100°.

can i used without the sensor valve

The control valve keeps the water temperature at the faucet at 100° by slowing the flow to a trickle. If you don't use the control valve, be prepared for the hot water to circulate at full speed and the temperature at the faucet to go up to whatever your water heater is set for.

Does this shut down the flow completely once temperature is reached or will it continue to trickle water into the cold water line?

The valve allows a slow flow of water back through the cold water line, enough to maintain the temperature at the faucet at about 100°F. If you let the hot water run, the temperature at the faucet goes over 100°F, and the valve shuts off the back flow through the cold water line. After the faucet is shut off, the water in the valve will cool to below 100°F, and the valve will crack open and allow some flow to keep the water warm. The valve does not bang open and shut. It opens more or less, as needed to keep the water warm at the faucet. It doesn't depend on the temperature set at the water heater, except that if the water is very hot, obviously it takes less to keep the water warm at the faucet. The valve accomplishes this automatically.

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🚿 Hot water on demand, savings on tap!

ECO CHAMPION WATER SAVER - Cut water waste dramatically—save up to 15,000 gallons annually and lower your utility bills while helping the planet.
INSTANT HOT WATER ZERO WAIT - Thermal bypass tech delivers hot water in under 15 seconds—never waste a drop or a moment.
QUIET ENERGY SAVVY OPERATION - Runs on standard 120V with a whisper-quiet pump housed in durable aluminum for long-lasting performance.
SMART TIMER FOR PEAK EFFICIENCY - Customize your pump’s schedule with a 24-hour dial featuring AM/PM and quarter-hour settings for ultimate control.
DIY FRIENDLY NO PLUMBING HASSLE - Easy installation with no return line needed—includes all adapters, valves, and mounting hardware for a seamless setup.

The Watts Hot Water Recirculation System with Programmable Timer is a 120V pump solution designed for tank water heaters that delivers instant hot water within 15 seconds. Featuring thermal bypass technology and a sensor valve, it recirculates cooled water back to the heater, conserving up to 15,000 gallons of water annually. Easy to install without additional plumbing, it includes a programmable 24-hour timer for customized operation, all housed in a durable aluminum pump. Ideal for eco-conscious professionals seeking convenience, efficiency, and water savings.

Технические характеристики

Brand	Watts Premier
Color	6.2 Inches X 6.0 Inches X 5.0 Inches Device + Equipment
Material	Aluminum
Style	Pump
Product Dimensions	6.2"L x 6"W x 5"H
Power Source	Corded Plug
Item Weight	6.4 Pounds
Maximum Flow Rate	6 Liters Per Minute
Voltage	120 Volts
Global Trade Identification Number	00098268254761
Manufacturer	Watts
UPC	737946470047 733353301905 798813036773 752913142826 735090278151 098268433470 098268253764
Part Number	0955800
Item Weight	6.4 pounds
Item model number	Instant
Is Discontinued By Manufacturer	No
Size	6" X 6"
Item Package Quantity	1
Number Of Pieces	1
Special Features	Easy to Install
Included Components	Pump, sensor valve, fittings.
Batteries Included?	No
Batteries Required?	No
Warranty Description	Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge

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