BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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1.2 WATER TEMPERATURE RISE vs FLOW RATE
NOTE: The boiler should be properly sized for its heating application and maintain an adequate water
flow rate during operation. Significantly oversizing the boiler or decreasing boiler water flow
rate will cause excessive stage cycling and result in premature failure of the contactors.
Water flow rate vs temperature rise formulas in US gallons per minute (GPM) and liters per minute (LPM):
6.94 x kW 14.6 x kW
GPM =
Temp. Rise (°F)
LPM =
Temp. Rise (°C)
Table 2: Water Temperature Rise vs Flow Rate in GPM (LPM)
Model KW
10°F (5.6°C) 20°F (11°C) 30°F (17°C) 40°F (22°C)
6BT 6 4.2 (16) 2.1 (8) 1.4 (5) 1.0 (4)
9BT 9 6.2 (23) 3.1 (12) 2.1 (8) 1.6 (6)
12BT 12 8.3 (31) 4.2 (16) 2.8 (10) 2.1 (8)
15BT 15 10.4 (39) 5.2 (20) 3.5 (13) 2.6 (10)
18BT 18 12.5 (47) 6.2 (24) 4.2 (15) 3.1 (12)
20BT 20 13.9 (52) 6.9 (27) 4.6 (17) 3.5 (13)
24BT 24 16.6 (63) 8.3 (32) 5.5 (21) 4.2 (16)
27BT 27 18.7 (70) 9.4 (36) 6.2 (23) 4.7 (18)
30BT 30 20.8 (78) 10.4 (40) 6.9 (26) 5.2 (20)
34BT 34 23.6 (89) 11.8 (45) 7.9 (29) 5.9 (23)
38BT 38 26.4 (99) 13.2 (50) 8.8 (33) 6.6 (25)
42BT 42 29.1 (109) 14.6 (56) 9.7 (36) 7.3 (28)
45BT 45 31.2 (117) 15.6 (60) 10.4 (39) 7.8 (30)
48BT 48 33.3 (125) 16.6 (64) 11.1 (41) 8.3 (32)
54BT 54 37.5 (141) 18.7 (72) 12.5 (46) 9.4 (36)
1.3 GENERAL DIMENSIONS
Figure 1 – General Dimensions
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