Tank water heaters typically last 10-15 years or longer; older boilers, in particular, will require a professional inspection to assess the situation and advise you on your options. In most cases, replacing the boiler is the simplest solution, especially given the energy efficiency of newer, more modern systems. However, in some cases, a faulty heating element or sensor may be the source of the problem. Increase the temperature setting on your water heater to see if it produces hotter water. If not, it’s time to call a professional plumber.