National guides put a replaced water heater anywhere from about $600 to $5,400 installed, depending on whose numbers you read. A same-type tank swap usually costs least; switching to tankless or a heat pump costs more. Where your job lands depends on the heater, whether you keep the same type, and the code work your house needs. Below is what moves the price, what a fair quote should list, and how to get a price from us.
Right now we take $250 off a water heater replacement and $300 off a tankless or heat pump install. Call (510) 939-7042 or book a visit and you get the full price, parts and labor, before any work starts.
What national guides say it costs
These are national figures, not Bay Area prices. Use them to sanity check a quote, not to predict one.
| Heater type | Installed cost (national) | Source |
|---|---|---|
| Any type | $1,600 to $5,400 | This Old House, updated 17 June 2026 |
| Tank | $1,200 to $2,300 | This Old House, updated 17 June 2026 |
| Tankless | $2,100 to $4,000 | This Old House, updated 17 June 2026 |
| Any type, total replacement | $600 to $4,500 | A.O. Smith (manufacturer), read 4 November 2026 |
Sources: This Old House, water heater installation cost (Alexis Carthan, updated 17 June 2026); A.O. Smith, water heater replacement cost (no date on the page; read 4 November 2026).
The two guides disagree on the low end. What matters is the spread: a same-type tank swap and a switch to tankless are different jobs, and one average tells you little about yours.
What moves the price
| Item | Why it changes the price | What to ask |
|---|---|---|
| Type of heater | Tank, tankless and heat pump units cost different amounts to buy and to install. | Which brand, model and size is in the quote? |
| Keeping the same type, or switching | Going from a gas tank to tankless or a heat pump can mean new gas piping, new venting or electrical work. A same-type swap usually needs less. | Does the price include any gas, vent or electrical changes? |
| Seismic straps | California law requires every new and replacement water heater to be braced, anchored or strapped against earthquakes. | Are new straps included? |
| Expansion tank | Some houses need one added at replacement. | Does my house need one, and is it in the price? |
| Permit and inspection | Permit rules and fees vary by city. | Will you pull the permit, and is the fee included? |
| Haul-away | Removing and disposing of the old heater is labor plus a disposal cost. | Do you take the old heater away? |
| Where the heater sits | A tight closet, attic or garage corner changes how long the job takes and which units fit. | Will the new unit fit the same space? |
Source for straps: California Health and Safety Code section 19211.
How tank, tankless and heat pump jobs compare
Replacing a tank with a tank is usually the least expensive job, because the gas or power supply, venting and space are already set up for it. If your heater sits in a tight closet, the question is often which new unit fits the space you have. Our water heater page covers what a straight swap involves.
Switching to tankless costs more up front. A gas tankless unit may need a larger gas line and different venting, and an electric tankless unit can need a large electrical service. A.O. Smith puts electric tankless at roughly 100 to 140 amps. Our tankless water heater page walks through the install and shows a Navien tankless we put in.
Switching to a heat pump water heater depends on room, airflow and your electrical panel. Those are the same limits behind the exemptions the Air District just adopted: panels below 100 amps, electrical runs over 50 feet, or not enough room or ventilation. Rebates can offset part of the cost, but programs and amounts change, so check the current program before you budget. More on our heat pump water heater page.
The Bay Area gas water heater rule
Updated 7 Nov 2026. On 4 November 2026 the Bay Area Air District board adopted changes to Rule 9-6. Here is where it stands:
- The zero-NOx requirement for new home water heaters now starts in January 2028, not January 2027.
- It applies only when you replace a heater. Nobody has to remove a gas heater that works, and repairing one is still allowed.
- Owners earning under 80% of area median income, or paying more than 28% of income toward mortgage and property taxes, are exempt. So are homes without the room, ventilation or electrical capacity for a compliant unit. News reports put the share of Bay Area households that could qualify at about half.
- Multifamily buildings and deed restricted affordable housing have until 1 January 2033. Heaters of 30 gallons or less are not covered by the zero-NOx standard.
Sources: Air District news release, 4 November 2026; KQED, 4 November 2026; San Francisco Chronicle. If you are not sure where your house falls, ask us when we come out.
Already have a quote? We'll look it over for free
If another company has quoted you for a new water heater, we will tell you what we would do and what it would cost. A fair quote lists each of these, so you can compare line by line:
- The heater: brand, model, size and fuel
- Labor to remove the old heater and install the new one
- Seismic straps
- An expansion tank, if your house needs one
- Any gas line, venting or electrical changes
- The permit, and whether the fee is included
- Hauling away the old heater
- The manufacturer's warranty on the heater
Have the written quote from the other company ready. The second opinion is free for homes in our service area.
Current water heater offers
- $250 off a water heater replacement. A new tank water heater, installed with the straps, venting and fittings it needs to meet code.
- $300 off a tankless or heat pump install. The gas, venting or electrical work is priced up front. Rebates are separate and depend on the program.
Residential, one per household, and they cannot be combined with other offers. Mention the $250 offer when you book. All current offers are on our specials page.
Common questions
Why do two quotes for the same water heater differ so much?
Usually because they cover different work. One quote may include new seismic straps, an expansion tank, the permit and hauling away the old heater, and the other may leave some of those out. Line up the quotes item by item before you compare totals.
Does the Bay Area gas water heater rule mean I have to replace my heater now?
No. On 4 November 2026 the Bay Area Air District board moved the zero-NOx start date for new home water heaters from January 2027 to January 2028. The rule applies only when you replace a heater. It does not make you remove one that works, and you can still have a gas heater repaired.
Do new water heaters in California have to be strapped?
Yes. Health and Safety Code section 19211 requires all new and replacement water heaters to be braced, anchored or strapped against earthquake motion, at a minimum to the California Plumbing Code. A replacement quote should include the straps.
Should I repair my water heater instead?
Sometimes a valve or part is the problem, not the tank. Our water heater repair and replacement page covers when a repair makes sense and when replacing is the better spend.
Get a price for your house
CNJ Plumbing is an independent, woman-owned plumbing company based in Alameda and serving the local Bay Area. We are not part of a national chain. We will look at your current heater, walk you through your options and give you the full price before we start, and our work comes with a one year labor warranty.
Call (510) 939-7042 (8am to 4pm, extended hours available, call to check) or book a visit online.