seachongo wrote:Anyone hazard a guess on the efficiency of using this in a rather small, but open door bedroom VS. using the older electric baseboard heater?

using the energy.gov formula for calculating the cost of an appliance, and assuming you use this 120 days of the year for 12 hours a day, and that electricity is 11 cents/kwh, and assuming you're running it on low (boy, that's a lot of assumptions), this will cost you $126.72 in electricity for the year.

Electric baseboards vary by the length of the baseboard and the age of the appliance. You can check your baseboard's wattage on the service plate. If there isn't a service plate, open the access panel to the electrical wires and see if there is one black wire or two feeding the heater. If it's one, it's 120 volts. If it's two, it's either 240 or 208. Since you're just estimating, we'll stop there--240 and 208 aren't so different.

Now, measure the length of your baseboard heater. If it's 24 inches long, at 120 or 240 volts, you're looking at 350 watts. 30 inches is 500 watts. 72 inches is 1500 watts. Since you said it was a small room, let's assume it's 24 inches long at 120 volts.

The formula for cost per year is:

(Wattage × Hours Used Per Day) (Days during year you use the appliance) ÷ 1000 = Annual Kilowatt-hour (kWh) consumption.

Then, take your Annual kWh consumtion and multiply that by your local utility's rate per kWh consumed to calculate the annual cost to run an appliance.

(Annual Kilowatt-hour) x ($$$$) = cost per year.

For your baseboard heater, I'll assume you run it for the same amount of time and the same number of days on the same 11c/hour estimate of cost. That'll run you $55.44 for the year.

I made a lot of assumptions here, though--if you've got one of those long heaters in there, it'll run you $237.60 for the year. Check it out for yourself--and happy number crunching!