When it comes to selecting the right gas space heater for your needs, several factors need to be considered to ensure you choose the appropriate size. The size of the space, climate zone, insulation, and other adjustment factors all play a crucial role in determining the required BTU (British Thermal Unit) output of the heater.
Factors to Consider
Space Size
The size of the space you need to heat is the primary factor in determining the required BTU output. As a general guideline:
- In very cold zones, you’ll need 1 kW (3,412 BTU/h) output for every 8.5 m² (91.5 ft²) of space.
- In cold zones, you’ll need 1 kW (3,412 BTU/h) output for every 10 m² (107.6 ft²) of space.
- In cool zones, you’ll need 1 kW (3,412 BTU/h) output for every 13 m² (139.9 ft²) of space.
- In mild zones, you’ll need 1 kW (3,412 BTU/h) output for every 16 m² (172.2 ft²) of space.
These figures assume a ceiling height of no more than 2.4 m (7.9 ft). If your ceilings are higher, you’ll need to adjust the calculation downwards by 5% for each meter (3.3 ft) above 2.4 m (7.9 ft).
Climate Zone
The climate zone you live in is another crucial factor. Colder climates will require more BTU output to heat the same size space compared to milder climates. For example, in very cold zones, you’ll need 1 kW (3,412 BTU/h) output for every 8.5 m² (91.5 ft²), while in mild zones, you’ll only need 1 kW (3,412 BTU/h) output for every 16 m² (172.2 ft²).
Insulation
The level of insulation in your home can also affect the required BTU output. If your home is well-insulated, you’ll need less BTU output to heat the same size space compared to a poorly insulated home. Similarly, if your home has many windows that let in cold air, you’ll need more BTU output to heat the same size space compared to a home with fewer windows.
Other Adjustment Factors
In addition to the factors mentioned above, there are other adjustments that can affect the required BTU output:
- Non-slab construction (built on pillars): Deduct 5%
- Carpeted floors: Deduct 5%
- Drapes on windows: Deduct 5%
- Ceiling height exceeding 2.4 m (7.9 ft): Deduct 5% for each meter (3.3 ft) above 2.4 m (7.9 ft)
Calculating the Required BTU Output
To calculate the required BTU output for your space heater, you can use the following formula:
(Desired temperature change) x (Cubic feet of space) x 0.133 = BTUs needed per hour
This formula takes into account the size of the space, the desired temperature change, and the climate zone.
Technical Specifications
When selecting a gas space heater, consider the following technical specifications:
| Specification | Description |
|---|---|
| Heating Capacity | The amount of heat the heater can produce, typically measured in BTUs per hour. |
| Fuel Type | The type of fuel the heater uses, such as natural gas or propane. |
| Efficiency | The percentage of fuel that is converted into heat, typically measured as AFUE (Annual Fuel Utilization Efficiency). |
| Ignition System | The method used to ignite the fuel, such as a pilot light or electronic ignition. |
| Venting | The method used to vent exhaust gases, such as a direct vent or vent-free system. |
| Controls | The type of controls available, such as a thermostat or manual adjustment. |
| Safety Features | The safety features included, such as an oxygen depletion sensor or tip-over switch. |
DIY Installation
If you’re comfortable with DIY projects, you can install a gas space heater yourself. However, it’s essential to follow all manufacturer instructions and local building codes carefully. Here are the general steps to follow:
- Choose the right location for the heater, taking into account clearance requirements and venting needs.
- Install the necessary venting, if required, following manufacturer instructions and local building codes.
- Connect the gas line, following manufacturer instructions and local building codes.
- Install the heater, following manufacturer instructions carefully.
- Test the heater to ensure it is working correctly and safely.
If you’re not comfortable with DIY installation, it’s recommended to hire a professional to ensure safe and efficient installation.
References
- Heat Wagon. (n.d.). Heater Size BTU Calculator. Retrieved from https://heatwagon.com/heater-size-btu-calculator/
- ELGAS. (2024, April 22). How to pick the right LPG heater size. Retrieved from https://www.elgas.com.au/elgas-knowledge-hub/residential-lpg/lpg-heater-size/
- Ferrellgas. (2020, June 8). How many BTUs you need to heat your home, shop, garage, and more. Retrieved from https://www.ferrellgas.com/tank-talk/blog-articles/how-many-btus-you-need-to-heat-your-home-shop-garage-and-more/