The 5OKW is the largest of the external stainless wood burning heaters and is ideal for smaller sized hot tubs or pools. The Backcountry external wood burning stove is made of AISI 430 Stainless steel and includes 3 lengths of chimney totaling 9 feet plus a stainless steel rain cap. A stainless steel flue adjustment in the chimney allows you to accurately control the fire. The interior fire box contains water baffles for extra heat as well as cast iron wood grate. Easy to clean ash tray is also used to remove ashes and add extra air ventilation during operation. An internal water temperature probe allows you to quickly read the operating water temp and make adjustments.
Sizing of a Wood fired pool or Wood fired hot tub heater
To size your heater you will need to know the approx volume of water in your pool or hot tub. Then use the chart to determine approx heat up times by the BTU output of each heater. Remember the output ratings are MAX BTU and will vary depending on type of wood and flame level.
Water Volume |
Water Mass |
Temperature Rise °F/hour |
||
| US Gal | lbs | Small (35MBH) | Medium (55 MBH) | Large 105 (MBH) |
| 100 | 833 | 42.0 | ||
| 200
200 1666 21.0
|
1666 | 21.0 | ||
| 300 | 2499 | 14.0 | 22.0 | |
| 400 | 3332 | 10.5 | 16.5 | |
| 500 | 4165 | 8.4 | 13.2 | |
| 600 | 4998 | 7.0 | 11.0 | 21.0 |
| 700 | 5831 | 6.0 | 9.4 | 18.0 |
| 800 | 6664 | 8.3 | 15.8 | |
| 900 | 7497 | 7.3 | 14.0 | |
| 1000 | 8330 | 6.6 | 12.6 | |
|
2000 |
16660 |
6.3 |
||
| 3000 | 24990 | 4.2 | ||
| 5000 | 41650 | 2.5 | ||
| 10000 | 83300 | 1.3 | ||
| *Excludes heat loss of tub/pool | ||||