Ok so I've just come across the specification of the heater and i definitely think it would be beneficial to run the heater to heat the engine faster.
The heaters heat output is 5000 watts and its fuel consumption is only .63 liters per hour so considering it only needs to run for maybe 3mins max thats only 31.5ml of diesel and i'm fairly sure I would save fuel over running a cold engine.
Andy
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