How Big of a heater (btu's) will I need to heat a 700 square foot space?

Answer 1

This depends on the number of windows and doors and the level of insulation along with the ceiling height

Enter all your parameters into the BTU calculator here and bob's your uncle: http://www.heatershop.com/btu_calculator.htm

Answer 2

It all depends on how well insulated you are. If you have a lot of air coming in you will need a big one. It depends on where you live also, in Northern Minnesota you need a lot of insulation and a pretty tight fit around the windows and doors. Take it from me I lived there and the heater ran a great deal of the time in the winter.

Answer 3

Somewhere between very little and very big.
How much you need depends on how good the insulation is and what the difference (delta-T) between the inside and outside temps are.

The size of the room makes very little difference, it's the rate that room loses heat that matters. A small poorly insulated room can lose more heat than a huge super-insulated one.

What is your location? What kind of construction? How many windows? What kind of windows are they? How big are they? What direction do they face? Are there any other rooms that share walls? How many outside walls in this room? What's above it? What's below it?

Answer 4

in the michigan climate,we figure 50 btu s per square foot. consider minimal insulation for this figure.the number fifty will be lower as you add insulation in.this is a number we use for figuring heaters for uninsulated pole barns. so your looking at 35,000 btu s.

Answer 5

We used a 20,000 btu for 1000 sq ft.and that was almost too much. So 15000 .