What is the heater pump on a school bus?

They’re Simple! Engine pre-heaters operate as hot water furnaces utilizing the buses own diesel fuel and batteries to produce heat. Effective! The heaters water pump circulates engine coolant to transfer heat to the engine and heat exchangers.

What does a heater pump do on a bus?

Engine pre-heaters operate as hot water furnaces utilizing the buses own diesel fuel and batteries to produce heat. Effective! The heaters water pump circulates engine coolant to transfer heat to the engine and heat exchangers.

How does a coolant heater work?

Thermosiphon Heating



A passive heating system that circulates coolant by thermal convection. Thermosiphon heaters are installed at the lowest point in a system, warm the coolant, and use thermal convection to circulate the coolant within the system.

What does a diesel engine block heater do?

Block Heater



Arguably the best cold-weather accessory a diesel pickup can have, 110-volt block heaters do exactly that: keep the engine block (and coolant) warm when a diesel truck is parked—typically overnight.

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