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Gas vs electric tankless water heater: which should you choose?
By the VettedHeater team · Last updated October 23, 2026 · How we verify
Gas tankless water heaters generally deliver higher flow rates than electric models (U.S. DOE Energy Saver, "Which Water Heater Is Right for You?"), so they suit larger households running several fixtures at once. Electric tankless units need no venting, but whole-house models can need major electrical capacity. The right answer usually depends on what your home already has.
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At a glance
| Gas (natural gas or propane) | Electric | |
|---|---|---|
| Flow rate | Generally higher (U.S. DOE Energy Saver, "Which Water Heater Is Right for You?") | Generally lower (U.S. DOE Energy Saver, "Which Water Heater Is Right for You?") |
| Venting | Required | None |
| Main install risk | Gas line may need upsizing (This Old House, "How Much Does Water Heater Installation Cost?" (updated 06/17/2026; cost data from The Home Depot)) | May need new circuits or a panel upgrade (This Old House, "How Much Does Water Heater Installation Cost?" (updated 06/17/2026; cost data from The Home Depot)) |
| City of San Diego permit | Plan-required Plumbing/Gas Permit for tankless (City of San Diego, Plumbing/Gas Permit); electrical work may need its own permit | |
Choose gas tankless if
- You already have gas service sized for it, or can upgrade it.
- You need to run two or more showers at once.
Choose electric tankless if
- You have no gas service, or want point-of-use heat at a single fixture.
- Your electrical panel has the capacity. Have an electrician confirm it before you buy.
Compare model efficiency (UEF) in the ENERGY STAR finder (ENERGY STAR Certified Water Heaters (product finder)). Next: size your unit, check installed costs, and find licensed tankless installers in San Diego.
Get a shortlist of licensed tankless pros
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Related tankless guides
- Tankless installation in San Diego
- Tankless water heater cost
- Tankless water heater sizing
- How to choose a tankless water heater
- Tankless vs tank
FAQs
Is gas or electric tankless cheaper to install?
It depends on your home. Gas retrofits can need gas line and venting work; electric ones can need panel upgrades. Get written quotes that itemize it.
Which gives more hot water, gas or electric tankless?
DOE says gas-fired demand heaters generally produce higher flow rates than electric ones.
Sources
- U.S. DOE Energy Saver, "Which Water Heater Is Right for You?" (checked October 23, 2026)
- This Old House, "How Much Does Water Heater Installation Cost?" (updated 06/17/2026; cost data from The Home Depot) (checked October 23, 2026)
- City of San Diego, Plumbing/Gas Permit (checked October 23, 2026)
- ENERGY STAR Certified Water Heaters (product finder) (checked October 23, 2026)