Boiler Efficiency Curve 100% Efficiency @ 5%
99%
Efficiency @ 25%
98%
Efficiency @ 50%
97%
Efficiency @ 75% Efficiency @ 100%
96%
Efficiency %
95% 94% 93% 92% 91% 90% 89% 88% 87% 86% 85% 50
60
70
80
90
100
110
120
130
Return Water Temperature @ 20°F Rise
140
150
160
170
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