Electric Heating: When It Can Be Rational

Direct electric heating is simple at appliance level, but suitability depends on heat demand, available electrical capacity and operating cost.

Demand before selection

First assess design heat load and annual demand. Equal floor areas can need different capacities because of envelope, climate and ventilation.

Comparison with a heat pump

A resistance heater converts electricity to heat, whereas a heat pump moves heat. Cost comparison requires seasonal heat-pump operation at specified temperatures, a tariff scenario and maintenance.

Electrical system

Check contracted capacity and simultaneous heating, hot water and appliance demand. Protection, cable sizes, circuit grouping and load management belong in the electrical design.

Backup and comfort

Heating can quickly exhaust a battery intended only for critical appliances. Consider building inertia, acceptable temperature decline and a separate extended-outage scenario.

Common mistakes

Low appliance cost does not prove low total cost. Do not transfer another project’s tariff or payback without its assumptions; assess summer cooling and ventilation separately.

ZeroHouse assessment diagram; not a construction detail.

Project review matrix
Item	Parameter	Check / result
Investment	Appliances and circuits	Full estimate
Operation	kWh and tariff	Scenarios
Outage	Critical circuits	Backup

What this means for your project

Compare complete cost and outage scenarios. Select the simpler system after verifying low heat load and available electrical capacity.

Sources and scope of review

Checked: 2026-09-09. Editorial guidance; not evidence of compliance for an individual building.