If you can’t justify reducing the return water temperatures, review your boiler choice.
I like to find reasons that are more data-based. But first, I must point out two things. One is that the reason to consider using a more expensive condensing boiler is expected increased efficiency. The second thing I want to mention is that some of the additional efficiency depends upon the controls, especially outdoor reset. I’ll deal with that in an upcoming column. But for now, let’s talk about whether to condense or not to condense.