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Typical condensing boiler gross efficiency curves for range of return... | Download Scientific Diagram
![Change in boiler gross efficiency (ηb) when burning fuel of different... | Download Scientific Diagram Change in boiler gross efficiency (ηb) when burning fuel of different... | Download Scientific Diagram](https://www.researchgate.net/publication/347617030/figure/fig1/AS:1022304427442184@1620747777321/Change-in-boiler-gross-efficiency-eb-when-burning-fuel-of-different-composition.jpg)