Agricultural Wikipedia: Cold Start Diesel Four Ways
Addition to the preheating mode, the method can also be preheated by hot water (hot
water will heat to the boiling point of injection up cooling system) vapor preheating method (steam through pipes under the water from the water tank into the cooling system, or directly into the engine cooling water jacket), electric preheating method (the heater directly into the cooling system or engine oil, the thermal efficiency of this method, use is also more convenient) and other methods for low temperature start.
Agricultural Wikipedia: Cold Start Diesel Four Ways