Engine coolant heaters

Engine coolant heaters are an essential component for diesel engines operating in cooler temperatures. They maintain an engine’s operating temperature during downtime and avoid any unnecessary idling. Pre-heating also allow the engine to deliver full power immediately, an important factor for critical power applications.


So, how do engine coolant heaters work?

Engine coolant heaters typically pre-heat the engine by thermosiphon or through forced circulation. By heating the coolant it can maintain an engine’s core temperature at an optimum level for start-up and load acceptance. Typically, this means keeping the coolant at a minimum of 32°C (90°F).

They are powered by a facility’s mains supply and, with the exception of weekly exercising and loss of normal power, will operate continuously.

Pre-heaters are a critical component wherever the National Fire Protection Association (NFPA) 110 – Standard for Emergency and Standby Power Systems applies. This standard states that emergency generator sets should be capable of starting and powering attached loads within 10 seconds after normal power is lost. Engine coolant heaters enable the genset engine to meet this requirement and take on the full load immediately.


Advantages of engine coolant heaters

Easier engine starts

  • Reduces warm-up time.
  • Allows the engine to deliver full power immediately.
  • Enables easier starts in cold conditions.
  • Saves fuel.
  • Prolongs battery life.
  • Provides immediate defrosting.
  • Enables compliance with NFPA 110.

Reduces engine wear

  • Reduces the wear on an engine due to low temperatures.
  • Stops destructive condensation.
  • Extends time between overhauls.

Protects the environment

  • Eliminates ‘white’ smoke upon start up.
  • Eliminates the need for engine idling.
  • Engine is ready for clean full power operation.
  • Also reduces noise pollution.

Are engine heaters expensive to run?

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