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Thermolec Modulating Electric Boiler Selection Guide

Standard Models Specifications @ 240V / 1ph (USA)
Dual-Energy Models B5U-FFB B6U-FFB B8U-FFB B9U-FFB B10U-FFB B12U-FFB B15U-FFB
Mon-Energy Models B5U-M B6U-M B8U-M B9U-M B10U-M B12U-M B15U-M
kW 5 6 8 9 10 12 15
BTU / H 17.060 20.472 27.296 30.708 34.120 39.238 51.180
Total Amps 20.83 25.00 33.33 37.50 41.67 47.92 62.50
No. of Power Supplies
(Breaker Size)
1 x 30A 1 x 40A 1 x 50A 1 x 50A 1 x 60A 1 x 60A 1 x 60A
1 x 30A
Recommend Water Flow Rate
vs Capacity in US Gal / min
1.8 2.0 3.1 3.1 3.5 4.2 5.3

Standard Models Specifications @ 240V / 1ph (USA)
Dual-Energy Models B18U-FFB B20U-FFB B23U-FFB B27U-FFB B30U-FFB B35U-FFB B40U-FFB
Mon-Energy Models B18U-M B20U-M B23U-M B27U-M B30U-M B35U-M B30U-M
kW 18 20 23 27 30 35 40
BTU / H 61.416 68.240 78.476 92.124 102.360 119.420 136.480
Total Amps 75.00 83.37 95.83 112.50 125.00 145.83 166.67
No. of Power Supplies
(Breaker Size)
1 x 60A
1 x 50A
2 x 60A 2 x 60A 2 x 50A
1 x 60A
3 x 60A 4 x 50A 4 x 60A
Recommend Water Flow Rate
vs Capacity in US Gal / min
6.2 7.0 8.0 8.8 10.4 12.2 13.9

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