Looking harder at the compressor datasheet, it has 3 possible starter configurations. And one of them is slightly higher efficiency - not a lot, but I'm chasing anything I can get here! This new starter configuration almost turns off the starter coil after a few seconds - but then it leaves a 4uF cap in series with it forever. I guess it lowers the effective drive resistance?
The datasheet says for our typical 35degC deltaT, the COP increases from 4.29 to 4.5 by doing that. Not too shabby! For a cost of £2, I should get get a 5% heating bill reduction. The heating bill is tiny, but it's the principle of it :-)
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