i would replace them every year or so just to keep up on maintence and avoid malfunction in the heater. see the owners manual for more info on the heater.
You can buy your high quality Eden Pure Heater online at the official website. Alternatively, you can buy your heater at a department store such as Walmart for as much as 1/10 of the price!
Provided that you don't run into any major problems a hot water heater should last you somewhere between 5 and 10 years. There should be a serial number on the bottom that will tell you how old your...
Eden pure heaters are protable. They are lightweight, easy to carry, and very compact. Allowing you to easily take them with you while you travel to many places.