zlacker

The money efficiency isn't great - if you had control of the design of the dishwasher, simply having a hot block of concrete inside that you heated when there was spare energy would work out far cheaper.

Concrete costs far fewer $$$'s than batteries do, per kwh of heat stored, it also doesn't require inverters, balancing or safety systems, ad lasts millions of cycles rather than thousands.

>>london+(OP)
How expensive would it be, transportation included, compared to an insulated water container of comparable heat capacity?

>>london+(OP)
Or maybe store hot water and heat it up at the best time...?

>>goodpo+Nb
The water is too hot to store safely.

You can still slowly heat it up to 70 or 80°C and just add some extra heat on use, but that will still leave a lot of immediate power to deal with.