i3maybe
Posts: 15
Joined: Mon Jan 13, 2020 2:34 am

Re: Auxilliary Heater

Tue Jan 14, 2020 2:04 am

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!!

jadnashuanh
Posts: 4990
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Auxilliary Heater

Tue Jan 14, 2020 10:01 pm

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.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above

i3maybe
Posts: 15
Joined: Mon Jan 13, 2020 2:34 am

Re: Auxilliary Heater

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?

alohart
Posts: 2074
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: Auxilliary Heater

Thu Jan 16, 2020 12:20 pm

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.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

i3maybe
Posts: 15
Joined: Mon Jan 13, 2020 2:34 am

Re: Auxilliary Heater

Wed Feb 12, 2020 3:43 am

Never gets that low where I am so it will be used all the time. Glad that I have specified it.

I noticed that in the UK the used i3's that seem to have the heat pump fitted are usually the ex BMW UK cars that are used for press events. (I guess they like to show the absolute maximum possible range for the press).

Ex-demo dealer cars never have it - no showroom appeal!!

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