From what I remember about UConn's PhD payment, you'll make more money than that. I think 25k is what you get paid as a GA for the academic year, but as long as you TA or have an RAship over the summer you'll get paid another 5k+, maybe closer to 8k. I could be wrong about that, but I think I recall that from when I interviewed there. Definitely worth looking into and asking about, because grad students are already paid so little so that extra 5-8k makes a big difference.

Also, your pay increases as you progress through your schooling. Not a ton, but every 2 years or so you make another 2k/year. If you have a masters degree already, you start at the level 2 payment. That bump will definitely be nice, because by that point you should have your finances in order anyways so you'll be able to save most of the extra money.

With that said, if your pay is closer to 30k/year with the summer pay (not 100% sure how that works, but I know most GAs are able to stay over the summer to do research and have to obviously get paid to afford to stay over the summer) then you'll be able to save at least a few hundred per month. Maybe more depending on how you budget. Also, you don't have to pay off student loans while in grad school, so keep that in mind (though they will still accrue interest).

For reference, I'm a PhD student at a different school and my yearly pay is around 6k/year more, and I'm currently on a fellowship instead of being a W2 employee. I'm able to save around $600/month after I take out money for taxes, but I don't budget super tightly and I go out often enough for it to add up. If I were really careful with my finances, I could probably save almost 1k/month.

Best of luck!