Hot Water Recirculation Pump Recommendations

[havasu]

Exactly. Actually, I purchased it off the shelf at my local Costco warehouse and used it before installing the new tankless water heater. It sure worked great though.

[USMC]

Hot water circulating pump we had lasted 1 month past its warranty and wasn't about to purchase the same brand after such a short life. Watts and Grundfos are different only in color and this time around I wanted something that would last and not nickel and dime me with replace comfort valves. We chose a Redytemp TL4000 hot water circulating pump for a number of reasons, mostly for the gas savings. On their site they succeeded in explaining why we couldn't get cold water with our past system. I thought loosing your cold water was just the nature of the beast when the cold water line is used with a hot water circulating pump. Then again, I should've expected it with multiple open comfort valves installed.

I know many will say that needing an outlet under the sink is a deal breaker. But not working the pi#@ out of my water heater and having my cold water back made it worth it. I simply dropped wires down from the existing outlet above the back splash. We use our system in both the pushbutton and timer modes. Our gas bill has gone down $15 dollars per month and our cold water is back. More importantly the wife likes it a lot more than our previous system and that's the rest of the story. (little Paul Harvey humor).

[ryoo1257]

mark it here

[Mark_Franklin]

WaterQuick Pro II

[jwwing]

Our last two houses have had Grundhos pumps, work great. The first house had the pump run full time, so I installed a timer and compared the savings - it was pretty close to astronomical. On the last house, I just went ahead and put a cheapy timer on it right away. Still working after 6 years. I run the pump from 5 am to 11 am then from 5 pm to 11 pm, so about half-time.

[Mark_Franklin]

The Grundfos is a nice system but even though it saves water it increases your energy costs. A demand style system like WaterQuick Pro II only works when there is a demand for hot water. Installation is exactly like the Grundfos system but without the long term energy costs.That probably isn't a concern where you are at, but people I have worked with in San Diego don't like the cost of running the Grundfos or any system on a timer.

[jwwing]

Hmmm - wish my builder had suggested this type of system to me. I think it still doesn't solve the hot water problem however. You still have to wait for it to feed back and replace the water in the pipe. The recirculating water system gives you hot water right away. The WaterQuick Pro has to have a delay - but it does look good. If the pump starts running when the faucet is opened, it would have to stop when the temperature at the faucet starts to rise or the cold water side will get hot - the net is that the pump has to have a pretty high flow rate to do that in a reasonable length of time - seems like it would be noisy.

[johnjh2o]

Originally Posted by Mark_Franklin

The Grundfos is a nice system but even though it saves water it increases your energy costs. A demand style system like WaterQuick Pro II only works when there is a demand for hot water. Installation is exactly like the Grundfos system but without the long term energy costs.That probably isn't a concern where you are at, but people I have worked with in San Diego don't like the cost of running the Grundfos or any system on a timer.

For one I can't see how that system would be any more effective then turning the water on. There is no way that pump can move the water any faster then opening a faucet. The idea of a re-circulating system is to have the hot water at the faucet before the faucet is turned on.

John

[Mark_Franklin]

Hot water circulation lines were designed to provide hot water immediately at a faucet but studies have shown that the convenience of having hot water immediately may save water but it is more than offset by the cost of keeping the line hot even when no one is using hot water.

The WaterQuick Pro II moves the water considerable faster than just turning on a faucet and is whisper quiet. The Bridge Valve that connects the hot and cold lines under the furthest sink closes when the water reaches 95 degrees so hot water does not go into the cold line.

Water is conserved, no energy is wasted and hot water is available in about 10 seconds.

[johnjh2o]

Mark, I'm sorry but there are some points I disagree with. There is added cost but the pump can not move the water faster then the pressure from the water system. These pumps have a 1/16 to 1/8 horse power motor and they can not develop any pressure. All they a capable of is to create a slight slight difference in pressure between the inlet and outlet side of the pump. They are not really pumps they are calculators. If you put the suction end in a bucket of water and turned it on you would see how little water it moves.

John