Usually boiler installation may take 1 – 2 days depending on the complexities i.e., boiler needs to be sited in a new location, it must be concealed, new radiators needed etc.or any hidden problems. In any of these scenarios the boiler installation could take a max of 2 days. However, during the works the engineer will inform you of any unforeseen situations and ensure the heating and hot water is returned without any delays.