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Quick Reference Chart to Determine BTU needs for
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To determine BTU needs for area:
1. Determine the square footage of space to
be heated.
2. Select the type of heater control system
(thermostat or manual).
3. Determine BTU zone from map.
4. Find the heater minimum input rate from
the table based on heater control system and Btu zone.
5. Multiply minimum input rate times square
footage times ceiling height. The result will provide minimum BTU
to ensure comfort under a range of operating conditions.
Example:
BTU Zone = 1
Manual Model Input Rate = .9
Square Feet = 4,098
Ceiling Height = 8
4,098 x .9 x 8 = 29,505 Minimum BTU
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Manually Controlled Models |
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| Model | BTU/Hr Input/Output | BTU Zone
1 | BTU Zone
2 | BTU Zone
3 | BTU Zone
4 | BTU Zone
5 |
| SR-30 | 30,000 | 4,167 | 2,586 | 1,923 | 1,531 | 1,190 |
| SR-18 | 18,000 | 2,500 | 1,552 | 1,154 | 918 | 714 |
| SR-10 | 10,000 | 1,389 | 862 | 641 | 510 | 397 |
| SR-6 | 6,000 | 833 | 517 | 385 | 306 | 238 |
| Minimum Input Rate Needed To Maintain Comfort
| 0.90 | 1.45 | 1.95 | 2.45 | 3.15 |
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Thermostatically Controlled Models |
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| Model | BTU/Hr Input/Output | BTU Zone
1 | BTU Zone
2 | BTU Zone
3 | BTU Zone
4 | BTU Zone
5 |
| SR-30T | 30,000 | 2,027 | 1,705 | 1,442 | 1,190 | 974 |
| SR-18T | 18,000 | 1,216 | 1,023 | 865 | 714 | 584 |
| SR-10T | 10,000 | 676 | 568 | 481 | 397 | 325 |
| VF-30 | 30,000 | 2,027 | 1,705 | 1,442 | 1,190 | 974 |
| VF-20 | 20,000 | 1,351 | 1,136 | 962 | 794 | 649 |
| VF-10 | 10,000 | 676 | 568 | 481 | 397 | 32 |
| Minimum Input Rate Needed To Maintain Comfort
| 1.85 | 2.20 | 2.60 | 3.15 | 3.85 |
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* This chart should be used as a guide only.
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- Click here for shipping details
- *Freight carriers sometimes charge a one time residential fee that the customer is responsible for.
- UPS items do not have a residential delivery fee.
- We can not ship to Canada, Alaska, & Hawaii.
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