I'm a good installer, and I believe the choice of preferred boiler is down to the installer. And the installer's experiences concerning the particular make of boiler. I think warranty support is also important.
Many budget boilers sold at one time or another have a bad reputation, much of this being down to poor or incorrect installation, and irregular servicing.
I fit Baxi Neta-tecs as my combi choice, I've had no issues with them and my customers think they're great.
As Tony posted, "Carefully installed on a clean system" is the most important. A long, well supported warranty is also good for peace of mind.
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