Depending on a couple of factors, it may be worthwhile to change the efficiency of the boiler you are calculating with, some examples:
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installed boilers are non-condensing
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installed boilers are aged
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…
You can do this by clicking on the pencil icon for “Efficiency lookup table”. Here you can make the choice between:
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The default: Condensing boiler efficiency table
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Custom: any .Csv file uploaded by you
You can download the below efficiency tables to implement as a custom table:
non-condensing boiler 70… non-condensing boiler 60… non-condensing boiler 50… non-condensing boiler 46… non-condensing boiler 90… non-condensing boiler 85… non-condensing boiler 83… non-condensing boiler 80… non-condensing boiler 75…
If you struggle implementing an Excel table, you can take a look at the question on .csv on this page for more information: Functional questions .