Hot water recirc question

[R2B2]

Hello. I have a two-story home with a basement with gravity fed recirculating hot water. I recently finished a bathroom in my basement that was roughed in when the house was built. When I open the hot water valve on the existing line that feeds the fixtures in the basement, I lose hot water to the upper floors. The basement fixtures are below the hot water and recirc line. Am I breaking the gravity loop when I open the valve to basement fixtures? Will adding a pump to recirc line solve this? Snip of schematic below.

 

[Breplum]

certainly a small recirc pump will do the trick. There are wireless pushbutton options to make it more efficient. Just all adds up cost-wise. Somewhat hard to justify on a ROI basis.

 

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[Jeff H Young]

I assume you when using hot water in basement and open a hot on second floor and you are "losing hot water to upper floors " that for a perhaps more than one reason a check valve down near bottom of tank is needed dont know how good it will work but try a swing check installed horrizontal if it worked befor on gravity it still should (I hope other wise install a pump as well )
when using basement hot you have a pressure drop and cold or luke warm water is flowing backwards through path of least resistance in your case you need that check valv e in my opinion