jdcbomb wrote:I'm wondering though if the PTC heater for 2018 and newer is more efficient than 2013-2017?
All resistance heaters have the same efficiency
Yes and no. All resistance heaters are rated "100% efficient" because any losses are in the form of heat, and thus get added back into the total. But if you compare, say, a baseboard electric radiator with a good fan-forced heater, you'll realize that some heaters are much more efficient at heating larger areas
. I've gone through many electric space heaters over the years, and some have been great at heating with a 900 watt input or less, while others have sucked using 1500 watts - they just create a small bubble of hot air around themselves, while the air 10' away from them is too cool. I use electric radiators as well, and just putting a small fan in front of one will greatly boost its effectiveness. (Depending on the thermostat setting, it may also increase the energy used.) So just because all resistance heaters are 100% efficient at converting electricity into heat, don't assume that they all work equally well at heating an area for a given energy input.
While I think that the air to air PTC heater in the 2018 Leaf is likely the same efficiency as it was (and quite likely the same actual unit), the HVAC system as a whole could be
more effective, and thus more efficient, at heating the cabin with less energy.