Originally Posted by pawoSD

Depends on where. Almost no HHO users around here overall....most use Nat Gas or Propane (if in the boonies) at this point. I have nat gas. Considering how cold it has been the bills have not been bad at all thanks to a 93% efficiency furnace. I can only wonder what people with old draft 50-55% furances are forking out though. Not only are they 40%+ less efficient but that draft uses indoor air, thus pulling even more cold air in every crack in the house while its running..... $$$$$ Doubling the bill would not be pretty.