ᐅ Connecting the dishwasher to the hot water supply—does it make sense?

Hello everyone!
According to the description, the Miele dishwasher we are getting can be connected to the hot water supply.

Since our KFW55 new build already includes a solar system with a 400-liter (106-gallon) hot water tank, and there are only two people in our household, I wanted to ask if it makes sense from an energy cost perspective to connect the dishwasher to the hot water supply and what your experiences are with this.

Thank you very much!

Just google it, this is a controversial topic. I wouldn’t do it.
- More complex
- Very little savings
- Long pipe run to the kitchen (takes a while to get warm)
- Appliances need to be compatible with it, including future ones

Better install photovoltaic panels on your roof to generate your own electricity for heating. Or consider using rainwater harvesting or similar systems, which are more practical.

One step back from me, I was specifically thinking about hot water supply for the washing machine, which would otherwise need a separate line.

If the hot water pipe is already there and the machine supports it, why not.

There would be hot water available in the kitchen. Whether I have the intermediate piece connected to the cold water tap or the hot water tap should not make much difference in terms of the pipe length.

Energy savings justify only a small additional cost financially. This is optimization at a high level.
Washing times are slightly reduced.
Durability of the machine and washing results remain unchanged.

Don't bother, it's not worth it.
A machine only needs a maximum of 11 liters (3 gallons), and only about half of that is warm water. Also, some enzyme-based detergents may stop working properly because the water gets too hot; the machine can't regulate the temperature as well as when it heats the water itself. Additionally, the drying function might not work as effectively in some cases.