It will provide marginal heat for the first little while, if it’s heating up the water that much, than you need more since it’s not enough…
And says the one that thinks water freezes top down, I don’t think we will be listening to your opinion here, thanks. You can’t even understand basic physics and you want to argue the finer points, this is a new one lmfao.
Of course, now you need to melt the water, without boiling it since the water is contaminated, too able to pump it away for remediation. It’s a logistical nightmare.
But you realize that just because the water is frozen doesn’t mean the exothermic reaction won’t happen…. Yeah?
Edit for your edit, yeah you clearly don’t if you seriously think water freezes top down that’s not a body of water…… and ice would stop a self igniting/oxidizing exothermic reaction….