Quick answer: Electric porch heaters are more efficient for small patios, costing around $0.25 per hour, while gas heaters are better for larger outdoor spaces, averaging $1.50 per hour. Choosing between them depends on your space size and energy costs.

Efficiency Comparison

Electric and gas heaters don't work the same way. Electric heaters convert almost all their energy into heat, giving them an efficiency rate close to 100%. Gas heaters, on the other hand, lose 15-20% of their energy through exhaust gases, dropping their efficiency to roughly 80%. That gap matters.

For small spaces, electric heaters shine. They provide focused heat, ideal for patios under 150 square feet. Gas heaters are better suited for bigger areas, especially when overhead installations are needed, but they're a poor fit for enclosed spaces due to ventilation requirements.

Key efficiency factors:

  • Electric heaters: Nearly 100% efficient for small areas.
  • Gas heaters: About 80% efficient, suitable for large spaces.

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Cost of Operation

Costs vary significantly between electric and gas heaters. Electric models typically consume 1,500 W per hour, costing $0.25/hour based on a national average of $0.17 per kWh. Gas heaters, running on propane or natural gas, cost around $1.50/hour for a 40,000 BTU unit. That's six times more per hour.

Electric heaters are more cost-effective for occasional use or small spaces. Gas heaters become economical for large areas, especially with frequent use. Over a season, an electric heater might save you 30% on energy bills compared to a gas unit. In Wirecutter's guide to outdoor heaters, electric models are highlighted as the cost-efficient choice for smaller patios, consistent with the hourly rate difference shown in the table below.

Cost breakdown:

| Heater Type | Hourly Cost | Efficiency | Best For | |----------------|-------------|------------|------------------------| | Electric | ~$0.25 | ~100% | Small patios (<150 sq ft) | | Gas (propane) | ~$1.50 | ~80% | Large spaces (>300 sq ft) |

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Installation Differences

Electric heaters are plug-and-play. Wall-mounted or freestanding models plug into a standard outlet, requiring no additional setup. Gas heaters are a different story. They demand more planning, including ventilation systems and fuel connections, and propane models need tanks while natural gas versions require a pipeline running to your home. It's not a quick weekend job.

Electric heaters are perfect for DIY setups. Gas heaters often require professional installation, adding $200-$500 to their initial cost. Don't overlook that when you're budgeting.

Installation costs:

  • Electric: $0-$50 (DIY-friendly)
  • Gas: $200-$500 (professional required)

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Environmental Impact

Electric heaters are cleaner when powered by renewable energy sources. They produce no direct emissions, making them ideal for eco-conscious homeowners who don't want to add to their carbon footprint. Gas heaters, however, release CO2 during operation. A 40,000 BTU propane heater emits around 5.5 lbs of CO2 per hour.

In 80% of cases, electric heaters reduce your carbon footprint compared to gas, especially if your electricity comes from solar or wind. That's a meaningful difference over a full heating season.

Environmental notes:

  • Electric heaters: Zero emissions with green energy.
  • Gas heaters: 5.5 lbs CO2/hour (propane).

FAQ

Are gas heaters safe for enclosed patios?

No, gas heaters require proper ventilation to avoid carbon monoxide buildup, making them unsuitable for enclosed spaces.

How long does a propane tank last with a gas heater?

A standard 20 lbs propane tank lasts about 11 hours when powering a 40,000 BTU heater.

Can electric heaters work in extreme cold?

Electric heaters can struggle in temperatures below 30°F, where gas heaters provide more consistent warmth.

What's the lifespan of electric vs gas heaters?

Electric heaters last 10-15 years with minimal maintenance. Gas heaters, if serviced annually, can last 8-12 years.

Which is cheaper to buy initially?

Electric heaters start at $50, while gas models typically cost $150-$400, excluding installation.