BMW Rallying Forum

Considering which to opt for with the new build...

I can't remember needing the heater to keep warm - but it is good for demisting and far more importantly I have had to put it on max on a number of occasions to stop the engine overheating:

a. when thermostat failed
b. when electric fan failed after water splash
c. when I forgot to switch fan on

On all above occasion we would have had to retire without the heater...

Have I answered my own question?

taking it out reduces water capacity, and removes a little radiator
i'm not saying it would but it could make the motor run warmer....
...then you'd be having a bespoke rad' made
do a test - bypass the heater first and see if the motor runs hotter before you make a decision?