| Vent Type: | Type B Vent (Chimney) Atmospheric |
|---|---|
| Application: | Heating |
| Boiler Type: | Standard |
| Fuel Type: | Natural Gas |
| Efficiency: | 84% |
| System Type: | Hydronic (Water) |
| Width (Inches): | 10" |
| Height (Inches): | 52.375" |
| Features: | EI/Spark Ignition |
| Depth (Inches): | 23-1/4" |
| Vent Size: | 4" |
| Water Connection: | 1" |
| Gas Connection: | 1/2" |
| BTU Input: | 67000 |
| DOE Rating: | 56000 |
| BTU Output: | 48000 |
| IBR Rating: | 48000 |
| Warranty: | 20 Year (Heat Exchanger)/ 2 Year (Parts) |

Replacement Parts
SKU: 381-359-072
Brand: Weil-McLain
Yes this unit can be converted from NG to LP
We would recommend a #30 expansion tank (e.g. Amtrol part 102-1). 51,000 BTUs is on the borderline between a #15 and a #30 as you mentioned, but going up a size is the safe thing to do. The only harm in oversizing an expansion tank is the added equipment cost.