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Sizing
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 | ||||
