You can do much better than having 25k earn 0.05% AER variable.
The best option would be to open a KBC Extra Regular Saver which pays 2.25% AER variable. You can deposit 10k at the start and then drip feed in 1k per month. The catch is you need to also open a KBC Extra Current Account but there will be no fees if you do not use your card and if you deposit at least 2.5k per month into your KBC Extra Current Account.
If that is too much hassle for you, given that you are a PTSB customer, you could open a PTSB Online Regular Saver which pays 1.00% AER variable. You can do this inside your existing PTSB online account. Drip feed at 1k per month. You could also open a KBC 21 Day Notice Regular Saver which pays 0.90% AER variable and also drop feed 1k per month into this account.