1. What are you looking to heat (at the same time)?

1 Sink
2 Sinks
1 Major water application at a time(ie Shower)
2 Major water applications at a time(ie 2 Showers)

2. Do you have gas or electric?

Electric Gas (NG - Natural Gas) Gas (LP - Propane)

3. If gas, how will you vent the exhaust?

Vertically(through roof)
Horizontally(through wall)
Outdoor install - No vent(non-freezing climate)