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Honeywell T991B1003 Boiler Reset 1 to 1 Ratio 135 ohm

Honeywell T991B1003 Boiler Reset 1 to 1 Ratio 135 ohm
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Product Code: T991B1003
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Honeywell T991B1003 Boiler Reset 1 to 1 Ratio 135 ohm

Automatic outdoor reset controller for air or liquid. Raises heating medium control point automatically as outdoor temperature falls.

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