You just made that up.
..which is not very well.
There is NO difference between a condensing boiler and non-condensing boiler. A condenser has a larger heat exchanger and a drain. The rest is about the same.
A good modern condensing boiler doesn't even need cleaning as the condensate washes down the heat exchanger. Threre is no reason not to have burner monitoring sensors to tell the customer when the burner is running out of tune. In other words, service on demand not by time as some cars are these days. The reliability and lowered running costs can be promoted by condensing boilers.
Atmos. Then Viessmann, ECO-hometec, Quantum, Atag, Buderus, ACV. "Some" Vaillants & W-Boschs.
Buy a cheapie the don't complain if it conks out a lot. Buy a cheapie and have a cowboy fit it to a dirty system and then you will have many conking!!!