Short answer: at Green Core Heating & Air, a standard gas or electric tank water heater replacement starts at $2,850. Heat pump and tankless water heaters cost more up front and are priced to your home, though heat pump models often qualify for rebates that bring the cost down.
The exact number depends on what kind of water heater you choose and what your home needs to install it safely and to code. Here's how it breaks down.
Water heater types at a glance
| Type | Up-front cost | Running cost | Typical lifespan | Rebates |
|---|---|---|---|---|
| Gas tank | Lowest (from $2,850) | Moderate | About 8 to 12 years | Rarely |
| Electric tank | Lowest (from $2,850) | Highest | About 10 to 15 years | Rarely |
| Tankless (gas) | Higher | Moderate | 15 to 20 years with yearly maintenance | Rarely |
| Heat pump | Higher | Lowest | About 10 to 15 years | Often |
What changes the price
- Type and size. A 40- or 50-gallon tank fits most homes. Bigger households or large soaking tubs may need more capacity.
- Venting. Gas water heaters need a proper flue or vent. Condensing tankless units vent through PVC, which may mean a new vent route.
- Gas line. Tankless units need more gas at once than a tank, so some homes need a larger gas line.
- Electrical. Heat pump water heaters need a dedicated circuit. If you're switching from gas, we check whether your panel can handle it.
- Code items. California requires seismic strapping, a properly piped temperature and pressure relief valve, and a permit. An expansion tank is often required too.
- Location and access. A tight closet, attic, or crawlspace takes more time than an open garage.
Repair or replace?
Most tank water heaters last about 8 to 15 years. Replacement usually makes sense if:
- Water is leaking from the tank itself, not just a fitting or valve
- You see rusty water or corrosion around the base
- The tank is popping or rumbling from heavy sediment
- It's past 10 years old and needs an expensive part
A newer unit with a bad thermostat, heating element, or gas valve is often worth repairing. We'll tell you honestly which way we'd go.
Can you save with rebates?
Heat pump water heaters are where the incentives are. Depending on where you live and current program funding, you may qualify through TECH Clean California, Sonoma Clean Power (Sonoma County), MCE (Marin County), or BayREN. We check what's available and handle the paperwork. Note that the federal 25C tax credit ended for systems installed after December 31, 2025.
Because heat pump water heaters cost far less to run, the savings keep adding up after install. That's why many homeowners replacing a failed tank ask us to price both options side by side.
Need it fast?
If your water heater just failed, call us at (707) 988-5858. We offer same-day water heater replacement when our schedule allows, and we'll give you a clear written price before any work starts.
Common questions
Does the price include installation?
Our $2,850 starting price is for an installed gas or electric tank water heater. Your written quote lists everything included for your home.
How long does a water heater replacement take?
A straightforward tank-for-tank swap usually takes part of a day. Tankless and heat pump conversions can take longer if gas, venting, or electrical work is needed.
Do I need a permit?
Yes. Water heater replacement in California requires a permit, and we take care of it.