Good question.
Many building owners only change their boiler systems when they absolutely must – when there are a series of breakdowns or other problems. This may be after 30, 40, or even 50 years in some cases.
Depending on the engineer that you consult, you may also prefer to keep the same boiler configuration because “that’s what we’ve always done”. So you opt for a simple “replacement” system, switch like-for-like.
However, commercial boiler technology has likely advanced considerably since yours was installed, especially in its energy-efficiency.
Like-for-like systems may appear to be more cost-effective initially (model cost and installation) but if you are expecting your new system to last another 30-50 years, it may be worthwhile considering a more expensive boiler that provides significant running-cost savings over the longer term.
If you are able to select the right boiler AND install it properly (with the right insulation) AND maintain it properly to keep it running at optimal levels, you may just strike gold.
For example, in an apartment complex, even a small saving in energy unit per person per square foot can translate to major savings over the course of a year.
So, before you opt for a simple boiler replacement, talk to a professional about your other options and make a truly informed decision.