Retired Priest who wants to stay warm in my Leaf. After freezing last year in the Leaf last winter while substituting for 55 miles to a church I began looking for a way to do something to heat the car. I found this company who has a inline heater. Since I am not knowledgeable enough to understand if this would boost the heat with a additional fluid holding tank to add to the existing heater. http://www.electriccarpartscompany.com/
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oprions available. Thank You Jim Tubbs
Sorry, but I don't see how those electric heaters would help you.
The main problem with the LEAFs resistance heater is not insufficient capacity.
The problem is, using the LEAFs electric heater just uses too much battery power.
I remember calculating how many Wh you could leave in the battery, by adding a larger heatant tank, and preheating it from the wall at home before a trip. IIRC, I figured another 5 gallon tank could save you close to 1 kWh of battery power.
You actually could probably get the heat more
efficiently by filling a large container from your home water heater, and putting it in the passenger seat before you begin your drive. A Hot water bottle, for the road, if you will.
A slightly more practical suggestion might be an aftermarket seat-heater (if you don't already have heated seats) that plugs into your 12 V dash outlet.
It is not any more efficient than the car's heater, but it puts the heat where it counts...