Product Details:
| Intended Household: | 2-3 Person |
|---|---|
| Application: | Plumbing |
| Capacity (Gallons): | 39 |
| BTU Input: | 38000 |
| Fuel Type: | Propane |
| Energy Star Rated: | No |
| Energy Factor: | 0.60 |
| Vent Size: | 3" 5" 6" 4" |
| Vent Type: | Direct Vent |
| Water Connection: | 3/4" |
| ASME: | No |
| Max Pressure (PSI): | 150 |
| Gas Connection: | 1/2" |
| 1st Hour Delivery (Gallons): | 73 |
| Recovery 90°F Rise: | 41 GPH |
| Max Altitude (Feet): | 7700 |
| Diameter (Inches): | 22-1/4" |
| Depth (Inches): | 25-1/4" |
| Height (Inches): | 68" |
| Weight (lbs): | 167 lbs |
| Warranty: | 6 Year Tank/6 Year Parts Limited |

The manufacturer does not recommend going further than their recommended venting distance. They do not offer any kits to extend this distance. Please refer to page 13 of the user guide for complete venting instructions.
No, it does not require an external power source.
we are not provided with that info, you can try calling AO Smith directly.
Please refer to the Installation Guide at the link below, starting on page 13. http://s3.pexsupply.com/manuals/1277918330238/33771_PROD_FILE.pdf
You can, provided that there is adequate indoor combustion air.
Yes, it is.
According to the manufacturer, The GDV-40 series 100 is still available.