've noticed a lot of newer ovens meant to be installed anywhere in Europe accept various supplies i.e. simple single phase + neutral or various 3-phase configurations. In reality the oven elements only run on 230V regardless of which way you connect them up they don't use 400V at all, just split the load over the phases available
This has been the situation in Australia for many years; domestic electric ranges can be configured for single or two phase operation. There is a shorting strap connected across the phase terminals when only a single phase supply is used. Of course, being a resistive load, whether the two 240V feeds are in phase or not doesn't matter. Two and three phase supplies to houses are fairly common here so many ranges take advantage of this.
