Average Heater Usage Over a 24-hour Period
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| Heater Usage for 2/19/2006 |
 |
|
|
| 4:20 - 13:30 |
9.0 hrs |
| 14:30 - 15:00 |
0.5 hrs |
| 16:25 - 18:40 |
2.3 hrs |
| 21:30 - 22:30 |
1.0 hr |
| Total hrs |
12.8 hrs |
| Total BTU |
435,200 BTU |
| Total kWh |
126 kWh |
Mr. Davis has a rated 34,000 BTU heater that uses 9.9 kW per hour. The heater was on for large portions of the day, whether sunny or cloudy, in order to maintain a comfortable interior temperature. This estimation indicates 126 kWh energy usage per day as compared to Mr. Davis's billed average daily usage of 80 kWh/day. On the positive side, it looks like the heater is doing a good job of recirculating internal heat, evidenced by the rising heater curve paralleling the rising internal temperature from hour 10 to hour 14.
The solar resource of 60,000 BTU/day is equal to approximately 22% of the average daily heater usage (80 kWh/day corresponds to 274,000 BTU/day)
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