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Supplemental heat planning

Electric fireplace supplemental heat planner

Compare a room's estimated heat requirement with a 1,500 W reference heater. This is a planning illustration, not a heat-loss survey or an installation design.

1. Your room dimensions

Use the heated room area, not the entire floor of the house. Open doorways and air leakage can change actual heat requirements substantially.

2. Planning insulation assumption

These are explicit scenario assumptions, not ratings of your building. Actual design requires climate and building-envelope information.

Your planning result

Understand the limit before buying

Enter your room measurements and select an assumption.

Baseline: 10 W per square foot at an 8 ft ceiling. A 1,500 W reference is approximately 5,118 BTU/h. A result within this reference does not guarantee comfort or suitability. Never add heaters to a circuit based on this calculator. Refer supply, hardwiring, dedicated circuits and 240 V equipment to a licensed electrician.

Read the assumptions and limitations

How to use the estimate

Compare scenarios, not installation approvals. A higher ceiling or a more demanding insulation assumption raises the estimate. Your actual room also depends on climate, windows and air leakage. Ask a qualified professional to evaluate those factors.

Use the insert comparison for documented equipment details. The manual governs installation and electrical requirements.

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