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Reg 9 · Rule 6 New gas water heater installations end January 1, 2028 in the Bay Area. Existing units are unaffected. See how it affects your replacement →
Gas · Electric · On-Demand

Tankless
Water Heaters

Hot water on demand — no storage tank, no standby heat loss. Compact, long-lived, and available for same-day installation in most cases. Gas and electric models in stock.

Tankless water heater installation

On-demand. No tank. Hot water whenever you need it.

Tankless water heaters heat water directly as it flows through the unit — no storage tank, no reheating water that sits unused. You get continuous hot water on demand, a significantly smaller footprint, and a unit that typically lasts 15–20 years. Gas and electric models are available for indoor and outdoor installation, and we can complete most jobs the same day.

Annual descaling is recommended. Calcium buildup in the heat exchanger is the most common issue we see on tankless repairs — and it’s preventable. A descale every one to two years keeps the unit running correctly and prevents the leaks that shorten its life. These units combine a motherboard with multiple gas and water lines. Always use a trained professional for maintenance and repair.

What to consider

  • 01
    Endless hot waterTankless units heat water as you use it — no tank to deplete. Back-to-back showers, simultaneous loads, and high-demand mornings are handled without running cold.
  • 02
    Energy and cost savingsNo standby heat loss means you’re only paying to heat water when you actually need it. For homes using 40 gallons or less per day, a tankless unit can be 24–34% more efficient than a conventional tank.
  • 03
    Compact footprintMounts on a wall — indoors or outdoors — and frees up the floor space a tank unit occupies. Works in basements, closets, garages, and exterior walls with proper weather protection.
  • 04
    Longer lifespanWith proper maintenance, tankless units last 15–20 years — nearly double a standard gas tank. That longevity means fewer replacements and better long-term value.
  • 05
    Cleaner waterNo storage tank means no rust, sediment, or accumulated scale from standing water. The water you get is heated fresh on demand.

Installation — same day in most cases.

We install tankless units indoors and outdoors in all configurations and can complete most jobs the same day. Tankless installations sometimes require a new gas line size or a full venting replacement — we assess those requirements upfront and give you a complete price before any of our work begins. If other service professionals are required, electricians, etc., we'll let you know when we do our site survey inspections. If you’re unsure whether tankless is the right choice for your home, we’ll tell you honestly. We’d rather give you the right recommendation than sell you the wrong unit.

Certified On The Equipment We Install

A.O. SmithGas · ElectricNavienTanklessBradford WhiteGas · HPWHNoritzTanklessRheemGas · HPWHAmerican StandardGas BoschGas TakagiTankless
Trusted & Dependable

We'll give you our very best. Licensed and insured water heater specialists.

Top notch, 5 star quality on every service call.

★★★★★Tank replacement · Bay Area
Joseph arrived promptly and diagnosed the issue fast. He explained the work, the timeline, and each part as it went in. Very professional and competent.
Karen WilcoxVerified · 2026
★★★★★Repair · San Diego
Lee arrived quickly, identified the problem, and solved it fast with no upselling. I'd recommend him to anyone who needs service.
ArmanVerified · 2026
★★★★★Tank replacement · Bay Area
Best customer service on a water heater, ever. We had three leaks and needed a new unit. Joseph showed up in a heatwave with a great attitude.
Michael BuckVerified · 2026
Response coverage

Fastest possible scheduling. Arriving ASAP to get your hot water back up and running.

Vans stationed across the region, stocked for the failures that actually happen. When you call, we get you on the schedule as soon as possible and give you a real arrival window — not an all-day guess. Typical windows by service area:

Harris water heater technician on a Bay Area installation
Bay Area
Service area
Cities covered
East Bay
Oakland, Berkeley, San Leandro, Castro Valley
San Francisco & Peninsula
San Francisco, South San Francisco, Redwood City
Tri-Valley
Dublin, San Ramon, Pleasanton, Livermore
South Bay
San Jose, Santa Clara, Sunnyvale
Sacramento / Placer Counties
Countywide
All cities and communities in Sacramento / Placer Counties
San Diego County
Countywide
All cities and community in San Diego County