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Re: Auxilliary Heater

Posted: Tue Jan 14, 2020 2:04 am
by i3maybe
Again - thankyou for your comments.

I am better educated on the subject now than if I had rung 25 UK BMW dealers at random - and I suspect - got 25 different versions of B/S for my troubles!!

Re: Auxilliary Heater

Posted: Tue Jan 14, 2020 10:01 pm
by jadnashuanh
The heat pump outputs in the order of 3-4 W of heat for a one watt input, so, when available, and when heating is required, it can maximize your range versus with the REx, which only has the resistance heating. When it's cold enough outside, the BEV will revert to using the resistance heating, though, and in really frigid conditions, would be similar to the REx, except for the extra weight it is carrying around.

Re: Auxilliary Heater

Posted: Thu Jan 16, 2020 9:21 am
by i3maybe
Just on that last point, where I live the temperature is generally in the 5-15 degree centigrade range. My understanding is that this is a good range for heat pump efficiency - not too cold and not too hot. Am I correct?

Re: Auxilliary Heater

Posted: Thu Jan 16, 2020 12:20 pm
by alohart
i3maybe wrote:
Thu Jan 16, 2020 9:21 am
Just on that last point, where I live the temperature is generally in the 5-15 degree centigrade range. My understanding is that this is a good range for heat pump efficiency - not too cold and not too hot. Am I correct?
I've read in the BMW Training Manual series that the heat pump is used for cabin heating until ambient temperature drops below -10º C.