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We use the data provided by the Gaia Early Data Release 3 to search for ahighly-complete volume-limited sample of unresolved binaries consisting of awhite dwarf and a main sequence companion (i.e. WDMS binaries) within 100pc. Weselect 112 objects based on their location within the Hertzsprung-Russelldiagram, of which 97 are new identifications. We fit their spectral energydistributions (SED) with a two-body fitting algorithm implemented in VOSA(Virtual Observatory SED Analyser) to derive the effective temperatures,luminosities and radii (hence surface gravities and masses) of both components.The stellar parameters are compared to those from the currently largestcatalogue of close WDMS binaries, from the Sloan Digital Sky Survey (SDSS). Wefind important differences between the properties of the Gaia and SDSS samples.In particular, the Gaia sample contains WDMS binaries with considerably coolerwhite dwarfs and main sequence companions (some expected to be brown dwarfs).The Gaia sample also shows an important population of systems consisting ofcool and extremely low-mass white dwarfs, not present in the SDSS sample.Finally, using a Monte Carlo population synthesis code, we find that thevolume-limited sample of systems identified here seems to be highly complete(~80+-9 per cent), however it only represents ~9 per cent of the totalunderlying population. The missing ~91 per cent includes systems in which themain sequence companions entirely dominate the SEDs. We also estimate an upperlimit to the total space density of close WDMS binaries of ~(3.7+-1.9)x10^{-4}pc{-3}.

White dwarf-main sequence binaries from Gaia EDR3: the unresolved 100pc volume-limited sample