BOILER BOOK CFC-E PERFORMANCE DATA
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Table 4. Altitude Correction for Input Capacity at Various Altitude Levels
PERFORMANCE DATA
Efficiency
The Model CFC-E is a “full condensing” boiler realizing efficiency gain at variable operating
conditions. It is designed to extract the latent heat of condensation over a greater range than other
designs. The nominal point of condensation is approximately 132
F (55.5 C). The ClearFire, due to
its more efficient heat transfer design and lower stack temperature, is able to capture the latent heat
of condensation over a broader range.
Fuel-to-water efficiency is relative to specific operating conditions. Operating efficiency will be greater
in the “condensing” mode of operation as noted above, yet with its inherently greater heat transfer
surfaces and superior premix burner, the ClearFire’s efficiency under “traditional” hot water
conditions is also outstanding. Table 5 shows the guaranteed efficiencies at various operating
conditions and firing rates for Natural Gas. It should be noted that the efficiency is exceptional at
high fire and low fire versus other designs where high efficiency is realized only with low fire or
minimal firing rates and low temperature returns.
ClearFire Efficiencies
The tables below list the operating efficiencies of each size Model CFC-E boiler, including radiation losses. As
the Model CFC-E is a fully condensing boiler, maximum efficiency is obtained when operating within the
condensing mode, utilizing the latent heat of condensation.
Natural Gas MBTU/h at various altitudes
700' ASL 2000' 4000' 6000' 8000' 10000'
CFC-E 2000
2000 2000 1883 1747 1619 1552
CFC-E 1500
1500 1500 1500 1500 1500 1472
CFC-E 1000
1000 1000 945 877 813 779
CFC-E 750
750 750 750 707 655 628
CFC-E 500
500 500 473 438 406 389
** Ratings assume 35% excess air, 80F combustion air.
Blower speed adjustments should be made to match performance and local conditions accordingly.
For minimum gas supply pressures see Table 14. Altitude corrections for supply pressure should be made per Table 15
Natural gas heating value of 1000 BTU/SCF assumed.
LP Gas MBTU/h at various altitudes
700' ASL 2000' 4000' 6000' 8000' 10000'
CFC-E 2000
2000 2000 2000 1867 1730 1659
CFC-E 1500
1500 1500 1500 1500 1500 1500
CFC-E 1000
1000 1000 1000 926 858 822
CFC-E 750
750 750 750 750 724 694
CFC-E 500
500 500 500 472 437 419
** Ratings assume 40% excess air, 80F combustion air.
Blower speed adjustments should be made to match performance and local conditions accordingly.
For minimum gas supply pressures see Table 14. Altitude corrections for supply pressure should be made per Table 15\
LP (propane) gas heating value of 2500 BTU/SCF assumed.
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