A tankless heater doesn't need to be placed next to the shower. Just like an ordinary water heater with tank it can be placed in the basement or wherever is suitable. In practice, it is natural to put it in the bathroom.
I know there are shower heads with integrated heater, but those are not popular in the developed world.
High power tankless water heaters, like 20 kW, will give you a good flow rate, but there are some difficulties associated with them.
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[This message has been edited by C-H (edited 07-14-2003).]
