Should you fix or replace your hot water unit? The typical age of a hot water unit before it needs replacing is generally 10 years. However with advancements in technology, some are now expected to last for longer. Have a look at your warranty for guidance. For example, some gas continuous flow units come with a 12 year warranty, so they are expected to live a bit longer. If you are finding you are constantly running out of hot water, your unit may be too small for your needs. In this case it’s a good idea to discuss the option of a larger unit with your plumber. If your unit is relatively young, repair might be the best option.