scuwp:
Sorry I am with @timmmay on this one. I think 3 years isn't too bad.
The other point is that the OP doesn't say how much the original item cost, only that the replacement at today's value is $220. Value (and therefore reasonable life) should be based on what it cost, not the replacement value in today's money. I don't value my 10 year old car the same cost as the new model.
We had a wired one in our old house. Did the same job and cost about $30
I sincerely wish you all the best in seeking compensation under the CGA. It's not a battle I would be prepared to follow through with.
I suggest reading the CGA. You are adding a lot of complexity to the issue by using cars as an example, which really have no relationship to the problem the OP has. Cars depreciate very quickly and other factors such as mileage greatly affect the value. That is why insurers will often not replace an old car with a new one when it gets into a crash, they will usually offer an agreed cash amount. Whereas with consumer items, they will usually do a straight swap, new for old.