Example: Let's say you had an area equaling 20 X 30 feet, in a temperature climate with average insulation. The calculator would show a maximum of 15,600 BTU per hour output into the rooms. In this case, that direct vent fireplace that was 25,000 BTU's and 60% efficient (60% x 25,000=15,000 BTU's out) would be perfect to heat the area in most weather. Keep in mind that many gas units can cycle off and on in relation to a wall-mounted thermostat, so a larger unit may be OK too.
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