A household appliance for washing and drying laundry, comprising: - a washing and drying compartment (2) containing a drum (9) that is rotatable and designed to hold the laundry; a first conduit (3) for taking and re-introducing air for drying the laundry from and into the compartment (2); a condenser (4) for condensing the moisture present in the air for drying the laundry, said condenser (4) being located along the first conduit (3); heating means (5) for heating the air for drying the laundry, said means (5) being in thermal communication with at least one portion of said first conduit (3); a second conduit (6) for taking and re-introducing a washing liquid from and into the compartment (2); at least a first section (60) of said second conduit (6) being in thermal communication with said heating means (5) for heating the air for drying the laundry.