How Many BTU for Garage Heater? | Match BTUs To Your Garage

“`html

For the full breakdown, see our best 30000 BTU Garage Heater guide.

Buying the wrong garage heater wastes money twice: once at checkout, again every time it runs. Every garage heater is rated in BTU per hour, so sizing really means matching that hourly heat output to your space. The honest answer to how many BTU for garage heater you need depends on your garage’s size, insulation, target temperature, and local winter lows—not on a single number. Work through the ranges and the formula below, and you’ll know the right target before you compare models.

Garage Heater BTU Ranges: What The Numbers Mean

Garage size matters, but insulation changes the number just as much.

Please use a real email you check. If it's fake or mistyped, your message won't reach us and we can't reply — wrong addresses are rejected automatically.

Name *Email *

Your comment *

Quick check — what is …? *

Garage Size	Insulation	Typical BTU Range
1-car, roughly 250 sq ft	Well insulated	7,500–10,000
1-car, roughly 250 sq ft	Uninsulated	20,000–30,000
2-car, 400–500 sq ft	Well insulated	12,000–20,000
2-car, 400–500 sq ft	Moderate