And taking water out!

Saying that all appliances turn energy to heat is true, but saying that all appliances do is turn energy in to heat is not. While heat is still a byproduct, lots of appliances make things move as well.

Why stop at appliances? By that logic, humans are nothing more than self-propelled heaters. The whole universe is nothing but shifting pockets of heat like the ripples of a pond bouncing back and forth until they all disappear.

Such nihilism.

False. My water filter pitcher does not turn energy into heat.

(Ok, fine, it uses gravity to move the water through a filter, which technically converts some of the potential energy of the water into heat through friction, but that’s not something the pitcher does, that’s something the earth does that the pitcher uses to its advantage.)

what you're describing is an oven with a heat pump. industrial-grade ovens like this exist, but they don't really exist in the home appliance market as the amount of energy recaptured at that scale would be negligable. it's easiere (and cheaper) to make ovens more energy efficient in other ways.

there are a number of other home appliances (washers, dryers, and dishwashers), however, which use inverter heat pumps to recapture/recycle heat, thus increasing energy efficiency by quite a lot.

I don't want to have to possibly call a plumber and electrician to fix my oven though.

You're reusing the heat to warm the house normally. Obv, you don't always want that, so you may opt to limit using the oven in summer for example, as it is the one which runs the longest.

I like your idea, but I think a tankless water heater would save more energy, and in that case you don't need hot water just sitting around.

Like an automotive carpet shampooer?

“Heating and water stuff” — that’s basically every form of power in the world safe solar and hydro. they all generally rely on creating steam to move a turbine, even nuclear.

A gas hob is so much better than an electric hob.

That's silly, they really don't use much power in the grand scheme of things. It uses a lot of power for a very short period, a small blip. Big power consumption comes from things that run often or all the time. It compounds.