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Archival X-ray observations of EF Eridani obtained in a low state revealeddistinct X-ray detections at a luminosity L_X ~ 2 10^{29} erg/s, three ordersof magnitude below its high state value. The plasma temperature was found to beas low as $kT \loa 2$ keV, a factor 10 below the high state. The X-ray/UV/IRspectral energy distribution suggests faint residual accretion rather thancoronal emission as being responsible for the low-state X-ray emission. EF Erithus showed a clear transition from being shock-dominated in the high state tobe cyclotron-dominated in the low state. From the optical/UV spectral energydistribution we re-determine the photospheric temperature of the white dwarf to\~10000K. Contrary to earlier claims, WD model atmospheres produce sufficientUV flux to reproduce the published GALEX flux and orbital modulation.Comment: A&A, in pres

XMM-Newton observations of EF Eridani: the textbook example of low-accretion rate polars