Controlling Flue Temperature


Old 05-25-13, 05:19 PM
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Controlling Flue Temperature

My gas-fired boiler controls inhibit the circulating pump when the water temp is below a low set-point - but measuring the water temp is a bit dicey, since it is affected by flow and the point where it is measured. Would it be practical to measure flue-gas temperature directly, and use it for control of the pump? I've never heard of it.
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Old 05-25-13, 06:19 PM
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I don't think measuring the flue temperature would be terribly effective for controlling the pump. In five minutes or less you would be at max flue temp yet the water could still be cold.

You don't need an exact temp to control your pump. Five or ten degrees wouldn't make a whole lot of difference.
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