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The city has to approve the electrical to the heater in it's entirety.
I am surprised the townhouse had an adequate service since it was not built with a tankless originally.
 

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I mean that a condo built/wired for a tank type heater which uses 25 amps (5.6 KW) and a whole house tankless can be as much as 75 amps (18KW).
 

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It may be a gas heater. I just assumed electric after mentioning running wiring and electrician. If a gas, that usually requires a bigger gas line than a tank type heater.
 

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So give us an idea of what the wiring is like. KV rating of heater, house service size, and size of circuit(s) wire. Perhaps a pic of the installation.
 
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