That looks like a monster!
My backup oil boiler is considerably smaller and uses 180W when running.
The only thing that consumes power should be the blower fan when the boiler is actually running. Normally that also runs the mechanical fuel pump so is the only consumer of power. A little bit for the electronic control system but this should be negligible.
It's worth checking out your circulating pump (or pumps) and what that is consuming, especially as it's possibly running 24/7. I recently realized that my pump was a big consumer (4.8kWh/day!) so I changed it for a more modern low energy pump (0.8kWh/day), that made a huge difference.
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