How Many BTUs Do You Need in Your Fireplace?

Learn about BTUs and what is recommended for your home.
Novus 30

BTU (British Thermal Unit) is a unit of measurement for heat. For fireplaces, the higher the BTUs, the higher the heat output. But how do you know how many BTUs are right for your home? You can find out by measuring the square footage of the area you want to heat and then finding a fireplace with the right amount of BTUs for the space.

Below is helpful information about Heatilator fireplace models, their BTUs and the space they will heat. The hearth experts at your local Heatilator dealer can also help you choose what BTU output would be best for your home.


Novus, Heatilator’s best-selling fireplace, has an established and renowned history of long-lasting performance. Its versatility is unmatched due to supreme installation flexibility and design customization options to fit in almost any space. It is available in four sizes and each of their heating capabilities are as follows:

Model BTUs Space it will Heat
Novus 30 14,000 – 20,000 400 – 700 square feet
Novus 33 15,000 – 22,000 500 – 700 square feet
Novus 36 17,000 – 25,000 600 – 900 square feet
Novus 42 19,500 – 27,500 700 – 1,100 square feet


The Crave offers luxury at an affordable price. To customize it for your home, you can choose from upgrade options and single-sided or see-through models. There are four Crave models and heating capacities are listed below:

Model BTUs Space it will Heat
Crave 36 17,500 – 30,000 600 - 900 square feet
Crave 48 21,000 – 40,000 800 – 1,300 square feet
Crave 60 26,000 – 50,000 1,300 – 2,100 square feet
Crave 72 30,000 – 58,000 1,500 – 2,400 square feet

gas fireplace

The Heirloom features authentic masonry style without the cost of a site-built masonry. With the largest fire viewing area in its class, the intense flames illuminate against a textured brick interior for a dramatic effect. This fireplace comes in three models, and heating capacities are listed below:

Model BTUs Space it will Heat
Heirloom 36 27,000 – 45,000 1,100 – 1,800 square feet
Heirloom 42 30,000 – 54,000 1,500 – 2,500 square feet
Heirloom 50 36,000 – 65,000 1,900 – 3,000 square feet

Heirloom series Gas Fireplace

When choosing what model fireplace is right for your home, variables such as the climate where you live, insulation, weatherproofing, ceiling height and the openness of your floor plan can impact the heating of that space. You don’t have to take the plunge alone. Talk to your local Heatilator dealer and make the right choice for your home.

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