Would love your input on a make shift recirculation port for hot water heater

[Ysleiro]

So I'm currently ideating a concept for creating a makeshift recirculation "port" for my Hot Water Heater. The HWH model I've got doesn't feature a factory recirculation port (Navien 240S).

Please take a look at the current setup image (let me know your thoughts). Then take a look at the proposal and give me your take.

The reason I'm attempting this is because I believe the current setup is inefficient. Specifically because circulated (heated) water is mixing with city water before making its way back to the HWH.

Current Setup:


Proposal:

 

[Mitchell-DIY-Guy]

https://www.navieninc.com/downloads/1-npe-s-with-external-circ-pump-en

 

[Ysleiro]

https://www.navieninc.com/downloads/1-npe-s-with-external-circ-pump-en

You're a god send. I couldn't find that.

Looks like my concept is over engineered (dumb) and my current setup just needs a check valve and an expansion tank.

 

[Mitchell-DIY-Guy]

You're a god send. I couldn't find that.

Thanks, but I'm hardly that. Anytime I find myself in some kind of situation (such as you are in) I first go to the website of the manufacturer and find the documents. In your case, I simply searched for "Navien 240S", and that link popped up in a flash. Took me more time to type this and find the link in the first place.

 

[TomFOhio]

Do you have the flush out ports at the in and out of the tank

 

[Mitchell-DIY-Guy]

Do you have the flush out ports at the in and out of the tank

I hope that ANYONE installing a tankless uses valves with these built in...such as those made by BrassCraft, Webstone and others...