There was another thread on this subject. As I recall you need to first call the tankless heater manufacturer to see if the unit is suitable for using a recirculating pump, AND the rate of water flow for the system to work correctly. They might even have a recommendation for the pump. Be sure to install a timer so you are not running the tankless water heater all the time.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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