"a bit of a dog in standby the fan stays on all the time without any load" means it uses too much power in standby?
I doubt the fan is much of the standby current draw, if that is the issue.
The only standby numbers I can find are Bryan's, a 3KW/9KW Kipoint with only 4W standby, which seems reasonable to me.
If it is the noise, change the fan. Maybe it has a ball bearing fan. Fans with bushings tend to be quieter and use less power but they wear out faster.
Something I contemplated... Change the main fan to thermostat controlled. Add another small hole in the case for a tiny 24/7 fan, like a 12V 50ma 1.25" laptop fan, just for some circulation.
G-