I ordered a heater from the internet. It is brand new, never used. I called Raypak and they said that they will not warranty heaters if they are purchased on line. Here's the thing, their distributor was going to charge double for the same heater which is a replacement for an existing heater. Same height, etc. I can see a 40% markup on the heater and an additional $600 to install it. I don't quite understand if they are selling through distribution channels that they choose why they won't honor the warranty. Just be aware.