
| BTU Input: | 125000 |
|---|---|
| BTU Output: | 78000 |
| Efficiency: | 81.5% |
| Vent Size: | 6" |
| Gas Connection: | 1/2" |
| Water Connection: | 1-1/4" |
| Weight (lbs): | 500 lbs |
| Width (Inches): | 21-1/4" |
| Vent Type: | Atmospheric |
| Height (Inches): | 33.75" |
| Depth (Inches): | 27-5/8" |
| Supply Tappings (NPT): | 3" |
| Return Tappings (NPT): | 2-1/2" |
A thermocoupling is a sensor that tells the gas valve that there is a flame and it is open to open.
Usually BTU output is determined by a technician or installer. It would depend on several factors including your location, the insulation in your house, and your total heat loss. This information would be necessary to get an accurate estimation.