245 volts has to be OK for European equipment. The voltage used throughout Europe (including the UK) has been harmonised since January 2003 at a nominal 230v 50 Hz (formerly 240V in UK, 220V in the rest of Europe) but this does not mean there has been a real change in the supply. Instead, the new “harmonised voltage limits” in most of Europe (the former 220V nominal countries) are now: 230V -10% +6% (i.e. 207.0 V-243.8 V) In the UK (former 240V nominal) they are: 230V -6% +10% (i.e. 216.2 V – 253.0 V).

@Michael thanks. Added.

UK & EU "harmonized" the electricity standards so EDF could sell in UK...

@SolarMike - I think you're kidding.

The spec sheet claims that the printer is "CSA listed," but it also says the input voltage needs to be in the range 200-240V.

@SolarMike The voltages agreed were 100000 volts DC in 1961, and an upgrade to 270000 volts DC around 1980. Each side has appropriate AC/DC converters to match its domestic EHV ranges. The UK domestic supply is separated from the 2 GW DC undersea link by at least three levels of transformers with voltage regulation. EDF sells power in the UK, and they supply some UK power French nuclear, but nobody knows who gets which electrons. It all just hits the UK National Grid via their load balancing criteria.

@SolarMike EU grid and U.K. grid have no AC interconnects. Frequency deviates (a few years back the EU grid was running 6 minutes behind, U.K. grid wasn’t impacted).

@Tim In addition to the insurmountable problems retaining synchronisation, carrying AC current through 2 x 45 kilometres of cable completely surrounded by salt water has overwhelming capacitance effects (it is bad enough at the height of a 30 metre tower in air).

This magical site grid.iamkate.com shows the live demand/supply state (broken down by fuel type) for the UK grid, with some historical data (from half-hour to annual). Currently shows UK exporting 6% of its generation through 8 HV/DC links to 5 EU countries.

@Paul_Pedant also see app.electricitymap.org/map which shows where our power comes from through the interconnectors.

ISTM this answer needs revision in light of OP's comment that this is an HP product.

@zwol ISTM means?

@Tim "It seems to me ... " :: I think "Typical Chinese shuffle" (in this answer) and "It’s an hp 800w latex printer" (OP comment to his own post) appear contradictory (possibly even defamatory). I have no idea what proportion of Chinese components go into this specific model, but I would not expect HP to threaten to void their warranty as stated, or to design anything that was so intolerant of voltage levels in this way. Although I had a clunker of an HP Electrostatic A0 plotter a long while back (random resets, spoiling a whole roll of paper, bad colours, initial palette not set) so ... .

@Paul_Pedant OP is the one who claimed HP would void the warranty, not harper. And harper is still right: HP shouldn’t be selling anything that doesn’t work with mains voltage.

@zwol thanks for letting me know. This is getting weirder and weirder.

@Paul_Pedant - regarding your comment 'who gets which electrons': in AC, the electrons only move back and forth, 50 or 60 times a second, and only about 20 cm. So all the french 'radioactive' electrons will stay in France. ;-)

@Aganju yes, the owners of the Pacific Intertie (DC) have supposedly said "The electrons we started pushing in 1971 still haven't left Oregon" :)

AC power networks don't just need to be frequency locked, they need to be in phase, so all the physical generators sping together, and grid tie inverters sense the phase. Between UK and the continent, or North and South islands of NZ, one reason DC is used for the link is to allow for syncing (the other is performance).

I think the US high voltage option (both sides of transformer rather than centre tap, used for cookers and so on) is 220v nominal (twice 110v).

@Aganju Just a metaphor to describe the fact that the grid is a power reservoir, not a routing system. I am acquainted with the drift velocity, and worked at UK National Grid control room for 7 years (plus 25 at various DNOs).