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The box says 'Grundfos Selectric' on it. And says Class H. Not sure what it is though?

Hi Guys Newbie question - sorry if it's a really obvious one but I've not had much to do with boilers or GCH before in my life. We had a radiator fall off our wall recently. A plumber re-fixed it on and sealed the pipes and everything appears to be OK in that regard. However...