dish washers and solar water heaters

Do most solar system have the ability to heat water hot enough for dish washer use, or is the axillary water heater necessary?

If you have read the other posts in this section you have seen that most solar water heating systems provide most of the annual and daily domestic hot water, but also that in almost all cases there is a back-up heater in place to "finish off" the heating. Depending on the temperature setting of the back-up, you may or may not need to use the auxilary in-washer heater.

Bob