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I correct my previous post. The dip switch did not fix the problem. Reduced the temperature variance perhaps but hasn't removed it.

Thanks for the info Valveman. There always seems to be another solution that I don't quite figure out in time. What is a VFD that you mention? Is the system you recommend a pressure tank alone or combined with a pump? -- For what it's worth, flipping that DIP switch on the Navien seems to...

I called Navien. Apparently there is a "DIP Switch" setting inside the main cover that needs to be changed when an external pump is used with this unit. Dip Switch 5 needs to be set to the "up" position. I'm not at home now, so have not yet tested, but will update this post later.

Hi, (Mods, if this should be in another sub forum please let me know) I've been running a Navien 240S on demand water heater for about a year in my house. Apart from having to wait for the heat at the shower it worked great. I'm doing a reno though and have added a couple bathrooms, and...

I'm doing a big reno and always trying to come up with better solutions for the job. Right now working on getting my pressure boosting pump and on demand water heater to play nice.