What percentage of a washing machine's energy is used purely to heat hot water?

MP1995

Bosch 1 hour quick wash

20oC total 200wh 
30oC total 600wh
40oC total 960wh

Probably useless for most but it's handy for us to know and programming for specific Agile slots.

bob2302

MP1995 said:

Bosch 1 hour quick wash

20oC total 200wh 
30oC total 600wh
40oC total 960wh

Probably useless for most but it's handy for us to know and programming for specific Agile slots.

But note that for warm washes most of the energy will be used in at most the first hour. I don't see much of an advantage in doing a quick wash on agile unless the the clothes can't take something longer. I sometimes do a 90C maintenance wash or a 60C cotton wash to clean the machine and I'm happy to let this run into the peak period, if I've aligned the heating with plunge pricing.

Your 20C quick wash uses the same energy as a full Eco 40-60 wash.