Short answer: choose a heat pump water heater if you want the lowest monthly bills, rebates, and an all-electric home. Choose a tankless water heater if your household never wants to run out of hot water and you plan to stay on gas.
Both are big upgrades over a standard tank. They just solve different problems.
How each one works
A heat pump water heater pulls heat from the surrounding air and moves it into a storage tank, a lot like a refrigerator in reverse. It can be three to four times more efficient than a standard electric tank. We install SANCO2 split systems, with a quiet outdoor heat pump and indoor tank, and GE GeoSpring hybrid tanks.
A tankless water heater fires a gas burner only when you open a tap, heating water as it flows through. There's no tank to run empty. We install Navien condensing tankless units, which mount on a wall and vent through PVC.
Side-by-side
| Heat pump water heater | Tankless (gas) | |
|---|---|---|
| Monthly running cost | Lowest | Moderate |
| Hot water supply | Stored tank, sized to your household | Endless, up to its flow rate |
| Rebates | Often available | Rarely |
| Fuel | All-electric | Natural gas |
| Space | Needs room and airflow, or an outdoor unit | Compact, wall-mounted |
| Install needs | Dedicated electrical circuit | Gas line sizing and venting |
| Maintenance | Clean the air filter, check the anode | Yearly flush |
When a heat pump water heater makes sense
- You want the lowest operating cost over the life of the unit
- You're working toward an all-electric home, or you have solar
- You want to take advantage of rebates from TECH Clean California, Sonoma Clean Power, MCE, or BayREN (availability depends on location and current funding)
- You have a garage, basement, or outdoor spot for the equipment
Our mild North Bay climate is a good match. Heat pump water heaters work best in spaces that don't get very cold, and SANCO2 systems keep heating water efficiently even on chilly mornings.
When tankless makes sense
- Your household runs back-to-back showers, a big tub, or several fixtures at once
- You want to free up floor space in a closet or garage
- You have, or can add, enough gas supply for a tankless unit
- You plan to keep gas appliances in the home
What about cost?
Both cost more up front than a standard tank, which starts at $2,850 with Green Core. Heat pump water heaters often close that gap with rebates and lower monthly bills. Tankless costs depend heavily on whether your gas line or venting needs upgrades. We'll give you a written price for each option so you can compare.
Still deciding?
There's no wrong answer, only the right fit for your home. Call us at (707) 988-5858 and we'll look at your space, your panel or gas line, and how your family uses hot water, then recommend the option that makes sense.