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I just moved into this house. It still has the radiator unit but it's too hot. How do I turn the heat down? I turned the thermostat off, but it's still hot: does that mean I need a new thermostat?

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With a hot water system you can have more than one zone. Check if you have other thermostats in the house.

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If that is the correct thermostat, I think a stuck control valve is more likely than a bad thermostat. Could be either, or broken wiring, or something else depending on the specifics of your system. –  bcworkz Mar 10 '13 at 21:01

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