Have you ever used an on-demand water heater?
 

I'm thinking about replacing my old water heater with an on-demand one. Have you ever had one, and how did you like it? Pros/cons?

As in the tankless water heaters?
If so yes and they kick ass. Zero draw backs at all in my opinion and the ability to set temp zones as well as water preference importance orders. (meaning shower is say more important than the kitchen sink and so on)
Plus the ability to take a 2 hour hot shower if I want just is an additional perk, even though I would never do so.

Shouldn't this dingleberry be paying his bills first before he buys awater heater?

In Europe.... Great! Very Hot, non stop , and cheaper than keeping hot a tank of 60 gallons.

yep, have one at home, deffinately worth it :)