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Bosch Tankless Problem

jmph Member Posts: 2
We have a Bosch Tankless Hot Water Heater that performs great in all areas of the house except one...the extra bathroom sink.  I have read some posts on other sites that if there is not enough flow when the sink faucet is turned on the Water Heater will not kick on.  It seems that is true for us.  If we turn on the bathtub faucet at the same time the Water Heater will kick on.  Yet, there are times when the same faucet will produce hot water.

Also, in the master bath..if the toilet is flushed while someone is taking a shower, the hot water diminishes for a few seconds without reduced water flow.

Can anyone help?
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