Modulating burner vs Min-Mßx

[mfqd13]

Hi,

I want to know how much can a boiler efficiency be improved by using a modulating burner vs a min/max.
I know that they are more suitable depending in the rate of the boiler, but for example, if we have a boiler with a burner capable of working in modulating mode, but it works now in a min/max mode, what will be the increase in the efficiency by putting it to work in modulating mode?

Thanks!

 

[jharris3]

My experience was a small % of overall burner efficiency but there was a modest improvement in cost efficiency.

What efficiency do you need to improve? (heat, energy, cost...)