The engineer will call you before your installation date to introduce themselves to you. When they come to your property, they will tell you about all the safety precautions you need to be aware of. Then they will begin the installation. Afterwards, the engineer will make sure you understand how to use your new boiler and the controls. They will leave your home clean and tidy, and will take all rubbish with them. They’ll also arrange the removal of your old boiler.