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High water flow

hrlevy
hrlevy Member Posts: 19
I have just installed 2 old Fedders hot water unit heaters in my garage. The BTU rating is not listed. The size of the radiator core is 16"x16"x2". It seems that the air leaving the unit heaters is not hot, it is just warm. I was wondering is it possible that I have too high of water flow through these units. I am using 00R 3 speed pump on this zone. Water temp is 140 entering unit, 135 leaving. The fan motor are old but still move a lot of air. If I keep the fans off for a few minutes the air is hot at first then goes back to being just warm.
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