Most High Rise condominium buildings and office buildings feature diesel emergency generators. With low running hours, the engines do not normally wear out. However, a generator older than 25 years is a candidate for replacement for the following reasons:
- Engine parts are no longer available or difficult to find.
- Installation no longer meets the codes; TSSA, Fire Department or fuel distributor require expensive changes
- Fuel system maintenance costs, such as requirement to polish diesel fuel and replace. Fuel must be tested annually and drained/refilled or cleaned to be reliable.