The published regional spread
This Old House, using data from The Home Depot, against a national average of $1,950:
| Region | Against the national average | What that is in dollars, our arithmetic |
|---|---|---|
| Pacific Northwest | up to 45% above | up to about $2,830 |
| Gulf Coast | 10% to 20% above | about $2,145 to $2,340 |
| Mid-Atlantic and Midwest | 5% to 10% below | about $1,755 to $1,850 |
| South Florida | 20% below | about $1,560 |
The dollar column is our conversion of This Old House's percentages against its own national average. The percentages are theirs.
The span is about $1,270 between the cheapest and most expensive region for the same job. For comparison, the entire permit on a straight swap is $50 to $300, and the haul-away is $100 to $500. Where you live moves the price more than any single line item on the invoice.
What drives it
Labor rates. Fixr: labor fees vary by location and usually scale with the cost of living, so labor costs drive up your total more in more expensive areas. Labor is 18% to 50% of a tank job on Fixr's own figures, so a 30% higher local rate moves the whole job by 5% to 15%.
Building codes. This Old House attributes the Pacific Northwest figure to strict building codes as well as higher labor rates. Codes are the mechanism by which a region adds line items, not just raises rates.
Permits. Fixr's permit range is $25 to $1,500, and Fixr notes some locations require separate electrical and plumbing permits rather than one. That is a jurisdiction-level difference, not a regional one, and two towns in the same state can differ.
The code items that are regional
These are the ones both sources price, and each of them applies in some places and not others:
| Item | Cost | Where it applies | Source |
|---|---|---|---|
| Seismic strapping | $100 to $300 | Earthquake zones | This Old House |
| Freeze protection, garage installs | $100 to $300 | Cold climates | This Old House |
| Expansion tank | $40 to $150, or $150 to $400 | Closed systems, increasingly required | This Old House, Fixr |
| Drain pan and drainage | $50 to $200 | Varies | This Old House |
| Attic installation surcharge | $200 to $1,000 | Where attic placement is the norm | This Old House |
That last row is itself regional. Attic and garage water heaters are common in warm parts of the country and rare in cold ones, which is one reason a national average is a weak guide to any particular house.
Where climate changes the answer, not just the price
This is separate from labor rates, and it is the part a percentage adjustment does not capture.
Heat pumps work better in warm climates. Fixr: hybrids are highly efficient, especially in warm climates. This Old House: performance may be affected in extremely cold environments, where the unit leans on its backup electric elements. In a cold garage, a heat pump does not deliver the running cost it is bought for. See heat pump water heater cost.
Passive solar only works in mild climates. Fixr states integral collector storage systems function only in areas with very mild or warm conditions, because they lose heat quickly when it is cloudy, cold or dark. See solar water heater cost.
Cold incoming water cuts tankless flow. A tankless unit raises incoming water to temperature in one pass, so colder supply water means a lower sustainable flow rate from the same unit. This Old House notes gas models offer value "in regions with cold incoming water" for this reason. The consequence is ours, not stated by either source.
What a national average is good for
Not much, on its own. Both sources publish one, and they differ: Fixr's average is $1,400 and This Old House's is $1,950, a 39% gap before any regional adjustment.
Our reading, stated as such: use the national ranges to tell whether a quote is roughly sane, then adjust by the regional percentage above, then check the code items in the table for your area. A quote at $2,600 looks high against Fixr's $900 to $3,000 range and entirely normal in Seattle.
What to do with this
Get three local quotes. That is the only way to establish your actual regional rate, and both sources recommend it independently: Fixr advises comparing at least three, and This Old House notes prices for identical tankless work vary by $500 or more between contractors.
If all three come in well above the adjusted figure, ask which code items are driving it. If all three come in well below, ask what is excluded. In both cases the answer is usually one of the rows in the table above.
Related: labor cost, permit cost, replacement cost calculator.
Sources
- This Old House, How Much Does Water Heater Installation Cost? (2026), updated June 17, 2026
- Fixr, How Much Does It Cost to Install a Water Heater? [2026 Data], updated January 27, 2026
- Fixr, How Much Does a Gas Water Heater Cost in 2026?, updated January 30, 2026
Price figures are national US ranges from the sources above as of the date shown. Your local price depends on labor rates, permits and site conditions. Read how we get our numbers.