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Should the return line come into drain of water heater or cold in.

Your question is not complete.
You have gas water heater in attic?
You are installing recirculation system? Which recirculation do you have? .. so expert can read instruction manual alongside you.
You can connect the recirc return line to the water heater drain valve only IF you have plumbed a separate return line for that installation.
Otherwise, the recirculation return line recirculates into the cold water inlet on water heater.
Copy following link for general illustrations showing both types of installation.

If you need further help, I’m available over the phone at

Aug 08, 2012 | Grundfos UP10-16BU/ATLC Comfort Series...

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Need to find a link to the owner's manual/ repair manual for the Grundfos up10-16 b5/atlc......

Following link shows links to grundfos and grundfos manuals.

1) My grundfos stopped working because sediment clogged the pump, and the motor slowed.
When motors slow, they get hot and burn up.
I ask my friend who rewinds motors how to fix it, he said in the old days, they rewound every motor, but today they throw valuable scrap into landfill, and then buy new motors from China.
I told him not to retire, but go to school and teach kids how to rewind motors, and then took apart the grundfos line and cleaned it out with CLR, but it never worked again.

2) If timer stops working, but pump still works, you can buy cheap plug-in timer and connect grundfos to the cheap timer

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 23, 2011 | Grundfos UP10-16B5/ATLC Comfort Series...

1 Answer

The hot water comes on immediately and sometimes takes ten to fifteen minutes I have the grundfos up10b5/atlc in my attic. The water is really a hard water kind. Can i clean it?

If your grunfos pump is clogged with hard water sediment, then it probably needs replacement.
You can try soaking it in CLR for a while, but I doubt it can be salvaged.
Sediment adheres to surfaces and there is no way to get inside the pump and scrub it out with a tooth brush.

You might benefit from replacing pump with the type that has a timer. That might save a bit of money. Or you can add a timer to the ordinary grundfos. If pump works fewer hours, it shouldn't clog up as quickly (or so the theory says)
And your water system might benefit by flushing your water heater each 6 months to prevent sediment from forming in the water heater.

Oct 21, 2010 | Grundfos UP10-16B5/ATLC Comfort Series...

1 Answer

My 15-10SU 7p/tlc pump will not run. I am lookimg

It will probably be cheaper to purchase another pump

Jan 05, 2010 | Grundfos UP15-10B5/ATLC 1/25 HP ...

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