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yeah i was going to go with this one: https://www.supplyhouse.com/Grundfos-99412493-UP10-16-Hot-Water-Recirculating-Temperature-Pump-1-1-4-Union looks like the check valve is removable. but might go with this one and also looking at the Taco 003...

I'm struggling to find the right pump. Is there one you can suggest that doesn't have a check valve? I really appreciate your time.

Got it. The pump has an internal check valve, should i still install the spring loaded check valve or is that an over kill/cause issues? Also, is this the boiler drain HERE?

The check valve? Nip, check valve, tee, boiler drain?

Check me please.

the return line is a 3/4.

Haha. tiny fittings indeed. It makes sense but curious, does the manufacturer approves such a method? Voids warranty?

Why is the drain better than the inlet?

No. 50G Tank

Thank you for the reply. I'm adding a check valve to the on the cold water inlet and will be using the Pex A to Pex B which is my concern.

Hello, I'm adding a circulating pump to a dedicated loop line that is Pex A. I don't have the expansion tool so would like to use steel rings since I have the tool for that. My question, since Pex B fittings are smaller in diameter, will the flow restriction be noticeable? Thank you.

Thank you, John. What's better about using the drain?

Hello All, I'm trying to add a recirculating pump to my water heater. Dedicated return line already there from builder. Is my placement in the picture below look correct? Am I missing anything? Also, is better or don't matter if I use the cold supply or tank drain to tie the return to? Thank you!