Ducted Heating - Servicing

Any experiences with people getting their ducted heating units serviced. Was it worthwhile? Do you do it regularly? Has it identified any performance issues?
 
PPOR or IP?

We have a Brivis gas ducted heater and it needed annual servicing to comply with the warranty. Once that expired we've only had it done every couple of years.
 
There are 2 units, one is an IP, the other a PPOR.

I know they both haven't been serviced for at least 3 years in the case of one and 5 years in the case of another. I haven't had any performance issues, but not knowing exactly what they do when they service, not sure if it picks up underperforming or inefficient devices.
 
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