With the exception of the Pool Heater, the other models are slightly smaller in size. Just imagine what you can do with that additional storage space. The unit is designed as a replacement for a conventional tank-type water heater.
Any plumber can install it wherever the existing unit is located.
The circuit breaker must be changed to one consistent with the specific model requirements. The wire connecting the water heater to the circuit breaker must be changed to a wire gauge consistent with local electrical codes. This should be done by an electrician. Complete Installation Instructions and a User Guide are included with each unit. Provide proof of purchase.