Cost are only depending on consumed energy.
A 30kW will run less hours a day than a 24kW, but at the end they both will use same amount of energy (gas). The 30kw may turn on/off more often a day.
It depends on your house whether it can “consume” 30kw or better stay with 24kW – the fewer radiators the less kw.
If you take a too small one it may not bring enough heat into your house on very cold days.
But if you did not freece till now it is usually better to stay with the smaller one.
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