I'm not sure which heatsink is used here. Certainly not the ones in my house. I have quite a few different radiator configurations (tall, short, wide, narrow). Most of them appear to be original from a 1915 home, but there is at least one that looks much newer. None of them are suitable for this device. The S-shaped hooks on them are not too narrow to reach the center of the radiator and snap into place. I don't think I've ever seen a heatsink that would match this device. Aside from not being suitable, I'm wondering how this plastic "humidifier" will hold up. The heatsinks get very hot and I think the plastic will melt over time. But since I couldn't hook them up, I couldn't test it.
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