I used to use a garrison triple wattage oil filled heater very similar most of the ones posted. I track my bills fairly closely. I found that it did not drop the bill much at all less than 7% difference (it is about 300/month) I actually switched to dual UTH systems and save enough in 6 months to pay for 2 herpstat pros extra flexwatt and everything I needed to do the conversion. My power bill is about 88$/ month and I have 5 more snakes than I did when it was 300. Something to think about.