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In this paper we present new photometric and radial velocity data for the PMS$\delta$ Sct star H254, member of the young cluster IC 348. PhotometricV,R$_C$,I$_C$ light curves were obtained at the Loiano and Asiago telescopes.The radial velocity data was acquired by means of the SARG@TNG spectrograph.High-resolution spectroscopy allowed us to derive precise stellar parametersand the chemical composition of the star, obtaining: T$_{\rmeff}$\,=\,6750\,$\pm$\,150 K; $\log g$\,=\,4.1\,$\pm$\,0.4 dex;[Fe/H]=-0.07$\pm$0.12 dex. Photometric and spectroscopic data were used toestimate the total absorption in the $V$ band A$_{\rm V}$=2.06$\pm$0.05 mag, inagreement with previous estimates. We adopted the technique of the differencein phase and amplitude between different photometric bands and radialvelocities to verify that H254 is (definitely) pulsating in a radial mode. Thisoccurrence allowed us to apply the CORS realization of the Baade--Wesselinkmethod to obtain a value for the linear radius of H254 equal to 3.3$\pm$0.7$R_\odot$.  This result was used in conjunction with photometry and effective temperatureto derive a distance estimate of 273$\pm$23 pc for H254, and, in turn for IC348, the host cluster. This value is in agreement within the errors with theresults derived from several past determinations and the evaluation obtainedthrough the Hipparcos parallaxes. Finally, we derived the luminosity of H254and studied its position in the Hertzsprung--Russell diagram. From thisanalysis it results that this $\delta$--Scuti occupies a position close to thered edge of the instability strip, pulsates in the fundamental mode, has a massof about 2.2 $M_\odot$ and an age of 5$\pm$1 Myr, older than previousestimates.

Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star: H254 in IC348