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Alternatives in boiler efficiency

Q. What are some alternatives in boiler efficiency other than new condensing boilers? A. Again, that depends on careful evaluation of existing boiler(s). However, you may have the following alternatives in boiler efficiency improvements:
Boiler System Improvement Measures

Possible Efficiency Gain

 Payback (years)
O2 Trim Packages

1% – 3%

 4 – 11
Linkage-less Controls

0.5% – 1.0%

   2 – 6
Economizers

2% – 5%

8 – 12
Flue Gas Recirculators

1% for 360 F incr. in combust air temp.

 >10 yrs
Flue Dampers/Turbulators

1% for 360 F reduction in stack gas temp.

 >10 yrs
Stack gas velocity reduction

up to 25%

< 2