Based on some advice received here, I'm looking at this as an option for my backup pump. I'm on city water just outside of Chicago, and according to my village, my pressure is 43-45 psi (never below 43). Based on that, I believe I'm a pretty good candidate.

My question is, which one? My requirements are 1) that it can handle a good amount of water -the pump it will back up is very active during periods of rain, as the section of basement it protects is part of an addition and is lower than the rest of the basement, and 2) I'd like some sort of alarm to let me know that it was used, so I can tell if my main pump failed and needs to be serviced or replaced.

I will likely discharge into the same pipe as the main pump - all of the discharge pipes are inside a heated basement, so no worries about freezing the discharge line, and I dump into the sanitary sewer (which IS legal in my suburb).

Any advice would be much appreciated. Thanks.

Here is the information you requested

There are something like 10 different AYMcD models.

That's the chart I was referring to....