I forgot to tell you that we hired a really good local electrical company to install it. The electrical company brought in the plumber to run the natural gas line and they pulled the permit for the electrical and plumbing and arranged the inspections. They bought it from a local generator company. The generator company did the actual commissioning of the unit and they are responsible for maintenance and oil changes.
Similar to our situation.
We did this after Ike.
Best decision, for storms/power glitches, etc., evah.