Best Tankless Water Heater for California (2026) — Endless Hot Water Picks
Tankless water heaters provide endless hot water and last 15-20 years. Rinnai and Navien lead. Pick by household size and gas vs electric.
Tankless water heaters give you endless hot water and 30% energy savings vs tank. The 2026 picks below cover gas and electric options. For California Title 24 compliance, premium tankless almost always exceeds requirements.
Quick Comparison
| Pick | Best For | Approx Price |
|---|---|---|
| Best Family-Size Gas Tankless | Rinnai RU199iN High-Efficiency Tankless (Indoor, Natural Gas) | $1,800-$2,400 |
| Best Premium Tankless | Navien NPE-240A2 Premium High-Efficiency Tankless | $2,200-$2,800 |
| Best Electric Tankless | Stiebel Eltron Tempra 36 Plus Electric Tankless | $900-$1,200 |
Our Picks
Sizing Tankless by Household
Tankless capacity is GPM (gallons per minute), not gallons stored. Standard fixtures: shower 2.5 GPM, sink 1.5 GPM, dishwasher 1.5 GPM.
1-2 person household: 5-7 GPM tankless (Rinnai RU130iN, Navien NPE-180A2).
3-4 person household: 8-10 GPM (Rinnai RU199iN, Navien NPE-240A2).
5+ person household: 11+ GPM, sometimes parallel install of two tankless units.
Gas vs Electric Tankless
Gas tankless: more powerful (high GPM), better for large households. Requires 3/4" gas line and 4" vent. The mainstream California choice.
Electric tankless: simpler install, no venting. Limited to small households (5-7 GPM max). Best for ADUs and single-bath spaces.
Indoor vs Outdoor Install
Indoor: requires venting through wall or roof. Cleaner aesthetic.
Outdoor: no venting needed (vent is built-in). Cheaper install but exposed to weather. Common in California for garage-mounted or wall-mounted exterior installs.
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Get a Water Heater Quote →Frequently Asked Questions
How long does tankless install take?
Like-for-like swap (existing tankless): 1 day. Tank-to-tankless conversion: 1-2 days (gas line + venting work).
Will my gas line support tankless?
Most older homes have 1/2" gas line; tankless needs 3/4". Upgrade is part of install ($199-499).
Recirculation pump worth it?
Yes — eliminates the wait for hot water. Built-in on Navien NPE-240A2; add-on for others.
Tank or tankless lifespan?
Tank: 8-12 years. Tankless: 15-20 years. Tankless wins long-term.
Cost installed?
Tank-to-tankless conversion: $1,899-$3,499. Like-for-like tankless replacement: $1,499-$2,499.
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