Two episodes of "TBH" hint at Granny's gradual assimilation: Commerce Bank gifts the family with a television in the first season. Granny sees the screen before it is powered on and asks whether it is a washing machine "like the one we have out back."
In another episode late in the series, a woman bribes her with a fur coat. Granny decides to give it back; but being the gracious, neighborly woman she is, wants to clean it first, and commands Ellie Mae to "get the washer started." Just before that scene cuts, we see Ellie start toward the laundry room.
As to the topic at hand, I have seen the first two "Bewitched" episodes before colorization, and agree with CircleW that those Maytags were unshaded copper. RE: the house overall, I have the surmise that Darrin lived in a rented house. I'm guessing it's a rental because he's way too enthusiastic about getting the place on Morning Glory Circle. The house was quite nice, too, and way larger than what a bachelor would need. The living room appears to be the set from "Hazel" - same low wall dividing the living room from the foyer; same HiFi console on the living room side of that wall; same staircase going up to the second floor. The house was quite nicely appointed, too, as far as furniture and fixtures go. Nicer than how a bachelor in the mid 1900s would typically decorate his house, the other clue in my never-to-be-humble opinion that the house is a furnished rental.