Bling
You can never have too much bling on an old boat.
This is my Taylor diesel heater. Nice and simple, and runs on fuel I already carry - it's nice not to need to carry yet another liquid for heating.

But - I don't actually rate the Taylor heater. It came with the boat, so I didn't buy it, but they are stupendously expensive for what they are - some sheet brass and a very simple burner.
Also, brass is pretty, but it has no place on a boat, in my humble opinion. The saltwater turns it a dirty, uneven greeny colour in no time. Unlike bronze, which is a structural metal (almost as strong as steel), and which turns an attractive green, brass is just there to be decorative, and as soon as the salt gets to work - it isn't.
If I was equiping the boat from scratch, I'd have a stainless steel diesel heater. Just as much bling, much tougher construction, and cheaper.
Now, Taylor toilets are a whole other thing. Bombproof and wonderful. But even so, not worth the £10,000 price tag. I'll write a blog about my Taylor toilet one day. A bog blog...