CA C-36 Lic. #890196 · Serving Sonoma County since 2007Lic. #890196 · Since 2007 (707) 892-0150
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Tankless vs. heat pump water heaters: which is right for your home?

A side-by-side comparison for Sonoma County homeowners weighing a gas Navien NPE-240A2 tankless against the electric Navien NWP500-50 heat pump: efficiency, real running costs at PG&E rates, hot-water supply, and what each one needs to install.

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The short version

  • Endless hot water

    On-demand gas heat never runs out, even for back-to-back showers.

    Tankless wins

  • All-electric, no gas

    Runs on electricity alone: the path if you’re getting off gas.

    Heat pump wins

  • Monthly running cost

    At PG&E’s high electric rates the two land close, not the big heat-pump savings you see elsewhere.

    About even

  • Rebates

    Heat-pump water heaters qualify for the biggest local and utility rebates.

    Heat pump wins

Head to head

Tankless vs. heat pump, at a glance

A gas Navien NPE-240A2 tankless next to the electric Navien NWP500-50 heat pump.

FeatureTanklessNavien NPE-240A2 (gas)Heat pumpNavien NWP500-50 (electric)
Energy sourceNatural gasElectricity (240V)
Efficiency (UEF)0.95, ENERGY STARBetter: 3.85: it moves heat, so it beats 1.0
Hot water supplyBetter: Endless on demand (up to 5.6 GPM at 67°F rise)65-gal first hour, then recovers (50-gal tank), best for moderate demand
Est. annual running cost*Better: $360–$445~$370–$480 (higher if it leans on electric backup)
Lifespan / warrantyBetter: 15–20+ years10-year parts and tank warranty (Navien)
Space & airBetter: Compact, wall-mountedFloor unit (63″ tall); needs a spot ≥40°F with air around it (garage/utility room)
Install needsGas line + dedicated venting240V / 30A circuit; pulls heat from the air (cools & dehumidifies the space)
NoiseBetter: SilentQuiet fan/compressor (under 45 dB)
RebatesLimitedBetter: Strongest: see the rebate finder
Best forEndless hot water, keeping gas, cold spacesGoing all-electric, max efficiency vs. a tank, moderate demand

Bottom line: at PG&E’s ~39¢/kWh, monthly running costs land about even. The heat pump’s real edge is rebates and getting off gas, not a lower bill.
* Estimated for a typical Sonoma County household at PG&E’s ~$2.78/therm gas and ~39¢/kWh electricity (2026). Real costs vary with your rate plan, hot-water use, and, for the heat pump, how often it falls back on its electric backup element. Not a quote.

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Water heater work, in our customers’ words

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SJ K. · Yelp review

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The two systems

How each one works

Gas tankless: Navien NPE-240A2

Efficiency 0.95 UEF · Flow rate 5.6 GPM · Lifespan 15–20+ yrs

A tankless unit fires a gas burner only when you open a hot tap, heating water as it flows, so it never runs out and wastes nothing keeping a tank warm. The Navien NPE-240A2 (0.95 UEF, ENERGY STAR) delivers up to 5.6 GPM at a 67°F rise, enough for several fixtures at once in a typical home.

  • Endless hot water: never runs out
  • Compact, wall-mounted: frees up floor space
  • Works anywhere, including a cold garage
  • Long service life with maintenance

Cons: burns natural gas (not all-electric); needs a gas line and dedicated venting; smaller rebates than a heat pump.

Heat pump: Navien NWP500-50

Efficiency 3.85 UEF · 1st hour 65 gal · Navien warranty 10 yrs

A heat-pump water heater works like a fridge in reverse: it moves heat out of the surrounding air into a 50-gallon tank instead of making heat directly, so it uses far less energy per gallon. The Navien NWP500-50 hits a 3.85 UEF with a 65-gallon first-hour rating, runs quietly (under 45 dB), and has an electric backup element for heavy-demand stretches.

  • All-electric: no gas needed
  • 3–4× more efficient than a standard tank
  • Qualifies for the biggest rebates
  • Dehumidifies and cools the space it sits in

Cons: needs a warmish spot (≥40°F) with air around it; a 50-gal tank leans on backup for big demand; PG&E’s electric rates offset much of the efficiency.

Want the full rundown on either one? See tankless water heaters and heat pump water heaters.

The honest cost picture

What it really costs to run in Sonoma County

Estimated energy cost for a typical household, annual and over 10 years. The bars are close, on purpose.

What these estimates assume: a typical 4-person household (think a 3–4 bedroom, 2-bath home) at PG&E’s 2026 rates, about $2.78/therm for gas and 39¢/kWh for electricity. A bigger or heavy-use household runs higher and a smaller one lower, but the takeaway holds: at PG&E’s electric rates the gas tankless and the heat pump run about even. These figures compare how the systems run, not a quote.

Annual running cost

PG&E ~$2.78/therm gas · ~39¢/kWh electricity (2026).

Gas tankless$360–$445
Heat pump~$370–$480

About the same either way at PG&E rates

10-year running cost

Same rates, no inflation adjustment.

Gas tankless$3,600–$4,450
Heat pump~$3,700–$4,800

Still about even over 10 years

Why so close?
The efficiency edge: a heat pump’s 3.85 UEF delivers roughly four units of heat per unit of electricity. Nationally, that’s a big win.
The local catch: PG&E electricity runs about 39¢/kWh, roughly double the national average, which cancels most of that edge versus an efficient gas tankless.
Heavy demand: a 50-gallon heat pump leans on its electric-resistance backup, which runs at ordinary tank efficiency, so busy households see the higher end of the range. The larger 80-gallon Navien NWP500-80 holds up better.
Bottom line: in our area, pick a heat pump for the rebates and to get off gas, not for a lower monthly bill. Staying on gas? A tankless is often the cheaper, simpler run. Either way, it’s far more efficient than an old standard tank. Against a tank, the heat pump does win on the bill: see tank vs. heat pump.

Make the call

Which is right for your home?

For most Sonoma County homes it comes down to gas vs. all-electric, your space, and rebates.

Go tankless if…

  • You want hot water that never runs out
  • You’re keeping natural gas and want the lower run cost here
  • The unit lives in a cold garage or a tight space

Best for: endless hot water on natural gas
See tank vs. tankless too

Go heat pump if…

  • You’re getting off gas or electrifying your home
  • You have a warmish garage or utility room with some air space
  • You want to capture the largest rebates

Best for: going all-electric with big rebates
Check current rebates

Navien heat pump water heater installed by Simeone Plumbing in a closet

Local water heater experts

We’ll tell you which one actually fits.

The right answer depends on your home: whether you have gas, whether your garage suits a heat pump, your hot-water habits, and which rebates you qualify for. Simeone Plumbing, Inc. sizes and installs both, to California Plumbing Code, and gives you the honest trade-offs for your house, not a one-size-fits-all pitch.

  • Straight advice on gas vs. all-electric for your home
  • Space, air, gas, and electrical checked before we quote
  • Rebate guidance so you capture what you qualify for
  • Fixed price approved by you before any work begins
  • Licensed: CA C-36 #890196
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On a new 40 or 50 gallon tank installed by Simeone, tank and parts coverage goes from 6 years to 10.

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Tankless vs. heat pump, questions answered

Is a heat pump cheaper to run than a tankless in Sonoma County?

Not really. At PG&E’s ~39¢/kWh electricity the two run about even. A heat pump is dramatically cheaper than an old electric or gas tank, but against an efficient gas tankless our high electric rates cancel out most of its efficiency edge. The heat pump’s savings come from rebates and getting off gas, not a lower monthly bill.

How much hot water does the 50-gallon Navien heat pump deliver?

The NWP500-50 has a 65-gallon first-hour rating, then recovers as it reheats the 50-gallon tank: plenty for a moderate-demand home. A large or busy household that wants truly endless hot water is often better on a tankless, or on the larger 80-gallon Navien NWP500-80. We size it to your peak use.

Where can a heat pump water heater go?

It needs a spot with some air volume and temperatures at or above 40°F. A garage or utility room usually works. It pulls heat from that air, so it gives off cool, slightly dehumidified air (a plus in a laundry room, less so in tight heated closets). It’s quiet (under 45 dB) but not silent. We check the space during the free assessment.

Do I need new wiring or gas work?

The heat pump needs a 240V / 30A circuit, which a licensed electrician adds if your home doesn't have one; the tankless needs a gas line and dedicated venting. We check your existing electrical, gas and venting up front, so there are no surprises.

Are there rebates for a heat pump water heater?

Yes. Heat-pump water heaters qualify for the largest local and utility rebates, and the programs and amounts change through the year. Check what’s live right now with our rebate finder, and we’ll confirm eligibility before you commit.

Can I go all-electric with a heat pump?

Yes. A heat-pump water heater runs on electricity alone, so it’s the natural pick if you’re removing gas or electrifying your home. If you’re staying on gas and want endless hot water, the tankless is usually the better fit.

How long does a tankless water heater last?

A well-maintained tankless unit typically runs 15 to 20+ years. Routine flushing helps it reach the top of that range.

Do you charge for a water heater estimate?

No. Estimates for a new or replacement water heater are always free, and you get a fixed price you approve before any work begins. If your current tank needs a repair instead, a tank water heater diagnostic is $129.

Not sure which water heater fits your home?

Get a free sizing assessment. We’ll lay out the honest options for your house.

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