I have a Jacuzzi brand tankless heater that I believe is actually a Rennai. It is located at the far end of the house. In the furthest bathroom I have a circulator pump that runs with a button push. Hit it and the pump stops in a minute or two and I have instant hot water.
The kitchen faucet is literally about 10 feet from the water heater but it seems to take forever to get hot water because of the low flow faucet. As mentioned above, no matter the type of heater the existing cold water must be pushed thru the pipe if it has not been used for a while
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