Ask to see the demo model "at your light company" -- well into the 1950s, the office of the electric company was where one went to buy electric appliances. And in the days before tumble dryers, "everything from heavy damp sheets to sheer silks" did in fact call for ironing. But what really caught my eye was the last speech in the dialogue: "Have our dealer send one out."
It's an interesting line, because of who it's coming from. If Tom and Helen are a typical middle-class couple of their time -- and as little affected by the Depression as they seem to be -- he's the employed one, and he handles all the money. Today, we'd assume that the selection of an iron would be handled by the person who did the ironing: but Tom probably takes care of their (his) bank account, gives Helen a weekly "housekeeping allowance", and decides himself how the rest of the money is to be spent. And note that Helen, while she's obviously had her eye on an Ironmaster for some time, hasn't brought it up until now -- until her desire for a new iron affects Tom's social life.