I am afraid that there is no set lifetime for any white goods.
I should point out that there is no legal requirement for an appliance or piece of equipment to last a certain time. There are a number of factors which could affect its likely lifespan, however, including the following:
• How often the appliance is used. With cars it is often the case that certain parts have an accepted lifespan and are likely to fail after so many miles have been clocked up. There is no similar rule for appliances, however. As a very rough rule of thumb, low end washing machines are likely to need repair after 600 hours use while the higher end can last for 10,000 hours or more. Logically the more often an appliance is used the quicker it is likely to fail.
• If the appliance is right for the job. A person living on their own is likely to use a tumble dryer fewer times than a family of five so can expect the same appliance to last longer. It really helps if you explain to the salesperson when purchasing an appliance how often it is likely to be used, say once a week as opposed to once a day.
• Breakdowns and component failure. “I only bought my machine two years ago and it needs a new wotsit costing £xx. Can I claim under consumer legislation?” Probably not. Breakdowns and components filing are just facts of life. No appliance will last forever.