1. a device that heats something in advance of its main use or processing
Usage: technical

Examples

• The furnace preheater warms the incoming air before combustion.
• Install a water preheater to improve the efficiency of your hot water system.
• The industrial preheater raises the temperature of raw materials before processing.
• A preheater in the HVAC system reduces energy consumption.
• The boiler preheater helps achieve optimal operating temperatures faster.
• Engineers designed a preheater to warm the fuel before it enters the engine.