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Low pressure on cold day

jpgrustas
jpgrustas Member Posts: 2
I have a customer with steam unit heaters, on cold days the boiler will not produce enough pressure to turn on the pressure switches, Could it be an underfired burner, there is no insulation on the steam piping, a combinatation of the two? Also, are unit heater generally designed for 2 psi inlet pressue?
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