Hot water ratings shown are at the STANDARD WATER FLOW RATE of 500 lb/hr (1 GPM) and 2000 lbs/hr (4 GPM) with 65° entering air temperature.

The use of I = B = R rating @ 4 GPM is limited to installations where flow rate is known to be equal to or greater than 4 GPM. If flow rate is unknown, use 1 GPM rating.

Ratings based on active length. Difference between active and total length is approximately 2".

All hot water ratings shown are determined in conformance with I-B-R code, and said ratings have been approved by the I = B = R Baseboard Rating Committee unless noted otherwise.

I-B-R ratings include 15% Heating Effect factor.


Model *Water Rate G.P.M. Average Temperature °F-Forced Hot Water
B.T.U. Per Hour Linear Foot of Finned Length
140 150 160 170 180 190 200 210 220
CLCU75 4 420 510 600 700 800 890 990 1090 1190
1 400 480 570 660 750 840 930 1030 1120
CLCU100 4 400 490 580 680 770 870 960 1070 1170
1 380 460 550 640 730 820 910 1010 1100

*Water Flow Correction Factors
G.P.M. Factor ¾" 1"
1.0 1.000 47 13
1.5 1.016 96 26
2.0 1.028 157 43
2.5 1.038 230 63
3.0 1.045 320 87
3.5 1.051 420 114
4.0 1.057 525 145
4.5 1.062 650 178
5.0 1.067 775 216
6.0 1.074 1060 290