I have a tankless water heater and any far shower or faucet takes minutes to get hot water. I would like to install a hot water recirculator but not certain if there are any concerns considering I have a tankless water heater. Thanks in advance for any help!

Yes, there are concerns. They involve selection of the correct pump with given water movement to activate the heater, to adding storage tank to your present set up, to voiding warranty if not following manufacturer's instructions.

I suggest you call the manufacturer and ask them which pump they suggest you install with that particular brand / model of tankless hot water heater. Once you have that information, come back and we will guide you through the installation.

Back to you / Milo