We're going to buy a wood gasification boiler soon, but we're not sure which one to get. We're looking into BioMax, Attack DP Profi, Orlan EKO, Econoburn. Since these boilers are expensive (and we've always heated our home with oil), we'd like some feedback about the quality and durability of the models mentioned before we actually purchase one. Anyone out there own one of these and have some input?