On 3 May, 21:12, "AL_z" wrote:

favour by installing a cheap, old, reliable, standard boiler, say from a
demolition yard, rather than forking out for a modern condensing combi?

Apart from the regulatory aspects of this, reliability isn't about the
type of boiler, it's about the manufacturer's build quality. There's a
difference, it's a significant and predictable one.

Also "combi" isn't the same thing as "condensing". The drawbacks of
older, undersized combis aren't visited upon condensing boilers.