Circulating (Pump) Coolant Heater
Also called: circulating tank heater, coolant circulation heater, hydronic pre-heater
The heavy artillery: a tank heater with an electric pump that actively pushes hot coolant through the engine and heater core all night.
Price
$120–$400 CAD
Wattage
1,000–1,800 W
Install
Shop recommended
Best for
See verdict
How it works
A circulation heater is a small tank containing a high-wattage element and a pump. Coolant is drawn from the engine, heated in the tank, and pumped back through the block and heater core in a continuous loop. Unlike thermosiphon designs, circulation doesn't depend on gravity — the whole engine warms evenly.
This is the standard fitment on Prairie diesel pickups, semi tractors without APUs, and heavy equipment. At 1,500 W a big diesel can hold near-operating coolant temperature through a -40°C night — and the cab blows warm air almost immediately on start.
Pros
- Fastest, most even engine warming available
- Warm cab heat right at startup
- Sized for big diesels
Cons
- Most expensive option
- Draws the most electricity
- More plumbing = more service points
Installation
Mounts to frame or body with hose plumbing into the cooling system. Shops charge $200–$450.
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