Path-Q Solar
How much could switching from gas heating to electric heating change the solar system I need?
Answer
It could increase electricity use substantially, but the amount varies widely. The change depends on the home's heating demand, heat-pump efficiency or electric-resistance equipment, climate, insulation, thermostat settings, and backup heating.
Key points
- A heat pump generally uses less electricity for the same heat than electric resistance, but its performance varies with conditions.
- Heating demand is seasonal, so added annual electricity use may occur when solar output is lower.
- Hot water, cooking, and other gas uses should be included separately if they will also be electrified.
What it depends on
- Current gas consumption and delivered heat
- Replacement equipment type and efficiency
- Building envelope and climate
- Heating setpoints and operating schedule
- Whether other gas loads are also electrified
Risks and trade-offs
- Using a simple conversion from gas units to electricity can produce a misleading estimate.
- A larger solar system may not eliminate winter grid purchases because of seasonal mismatch.
- Oversizing before equipment and building conditions are known can increase cost.
Information you may need
- At least one year of gas and electricity bills
- Heating system specifications
- Home size, insulation, and climate information
- Proposed electric heating equipment
- Expected hot-water and cooking changes
Your next step
What to do next
Ask for a building-load or heat-pump estimate and have the solar quote show current and fully electrified demand separately.
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