The thing is, I really like heating my water on demand. What's the point of having a big device full of water whose size is just a guess at how much I'll need. Having water heat on demand means always enough for the bath, and no wasted heating. Brilliant!

What's worse: learning to turn a few knobs, or having to suffer through a cold shower? (Or wasting a lot of resources when every house in the country has a batch of standing hot water?)