The technology necessary to get hot running water is pretty minimal. You could go with some sort of raised cistern with a way to heat it and some sort of valve to regulate the flow. The rest is gravity. The sort of stuff you need has been around for centuries.
If you're in a warm and sunny enough environment, you can rely on the fact that sun light will heat up a metal cistern coloured black. You'll be restricted to using warm water at certain times of day, and it's not exactly going to spray out near boiling, but you can use this to take warm showers.
Or boil water in a pot over a fire and put it into a tub. The technology to do that has been around for a very, very long time. You don't even need moving parts to do this. If you can hex a pot or a tub, more power to you.
As for convenience, there are a number of options. The least convenient is to just do it yourself. If you're wealthy, hire someone. Or since you're a wizard, make a bargain with some wee faeries.
If you're comfortable using a wood stove for heat and boiling your hot water, you should be able to live a relatively modern life, even as a wizard. It's just going to look a little odd to normal people.
