The two published ranges
| Source | 50-gallon tank, installed | Updated |
|---|---|---|
| Fixr | $900 to $2,500 | January 26, 2026 |
| This Old House | $700 to $1,800 | June 17, 2026 |
They overlap between $900 and $1,800, and that overlap is the honest answer for a straightforward replacement. Outside it they disagree in both directions: $200 at the bottom, $700 at the top.
Our reading, marked as ours, and it is about sourcing rather than arithmetic. This Old House states where its table comes from: cost estimates based on national averages from The Home Depot. Fixr says its figures are gathered from pricing databases, licensed contractors and industry experts. A retailer knows what the box costs and what its own installers charge for a standard job. A contractor database picks up the jobs that are not standard, which is where the top end lives. Neither is wrong. They are counting different populations, and that is worth more than splitting the difference.
Fixr's own average is $1,800, and it specifies what that buys: a standard natural gas, high-efficiency 50-gallon unit.
The size table, and an oddity in it
This Old House prices tanks by capacity:
| Tank size | Installation cost |
|---|---|
| 40 gallons | $600 to $1,200 |
| 50 gallons | $700 to $1,800 |
| 75 gallons | $900 to $2,300 |
| 80 gallons | $1,000 to $3,000 |
Our observation, marked as ours. On the same page, This Old House gives a national average of $1,950 for water heater installation. That is higher than the top of its own 50-gallon row and higher than the top of its 75-gallon row. A 50-gallon tank is not the expensive option on this publisher's own data; it sits below the average it prints a few paragraphs later. If you have been told that 50 gallons is where the price jumps, that is not what either source shows.
Fuel decides more than size
Fixr prices the same 50-gallon capacity by what heats it:
| Type | Installed cost |
|---|---|
| Electric | $700 to $1,900 |
| Gas or propane | $900 to $2,500 |
| Hybrid (heat pump) | $2,000 to $5,500 |
| Solar | $2,500 to $8,000 |
This Old House approaches it from the unit price instead: electric units cost about $850, gas models around $800 plus venting. For high-efficiency equipment it gives heat pump water heaters at $2,500 to $3,500 and solar at $2,000 to $5,500.
Note the solar gap. Fixr's top is $8,000, This Old House's is $5,500. Our note, marked as ours: solar is the one row where the two are not describing the same job, because a solar system's price is dominated by the collector array and the backup, not by the tank. Our solar water heater page covers that system on its own terms.
The expensive decision is not the tank at all. This Old House: if you want to switch fuel types compared with your current unit, budget an extra $1,500 to $2,000 for new electrical or gas lines. That is more than the entire price difference between a 40-gallon and an 80-gallon tank on its own table.
The labor line is arithmetic, not data
Fixr states that labor accounts for roughly 20% to 50% of the total price, typically $180 to $1,250.
We checked that against Fixr's own headline range, and this calculation is ours. Twenty percent of $900 is $180. Fifty percent of $2,500 is $1,250. Both ends of the labor range are exactly the stated percentage of the matching end of the headline range. So the dollar figures are not an independent measurement of what plumbers charge; they are the percentage applied to the range printed at the top of the same page.
That does not make them useless, but it does mean you should not treat "$180 to $1,250" as a second, confirming source. It is one number wearing two hats. The same pattern turned up in our radiant floor heating page and in several furnace sizing tables.
Fixr puts permits and a post-installation inspection at $25 to $1,500. That is a sixtyfold spread, which tells you the figure is a nationwide envelope rather than a usable estimate; our water heater permit page narrows it down.
Where you live moves it more than what you buy
This Old House gives regional differences against its $1,950 national average, based on data from The Home Depot:
| Region | Against the national average |
|---|---|
| Pacific Northwest | up to 45% above |
| Gulf Coast | 10% to 20% above |
| Mid-Atlantic and Midwest | about 5% to 10% below |
| South Florida | 20% lower |
It attributes the Pacific Northwest figure to strict building codes and higher labor rates.
Our reading, marked as ours. A 45% swing is larger than the gap between the two publishers' entire ranges. If you are comparing your quote against a national figure and you live in Seattle or Miami, the national figure is the wrong comparison. Ask neighbours, not the internet.
Do not wait for the leak
This Old House quotes its plumbing and heating expert Richard Trethewey:
Most people make the decision about their water heater when the existing one leaks and they only have 24 hours to get it changed.
Our reading, marked as ours. That is the single most expensive habit in this entire category, and it is not expensive because of an emergency surcharge. It is expensive because 24 hours is not enough time to get three quotes, not enough time to consider a heat pump unit that might pay for itself, and not enough time to discover that the code now wants an expansion tank. Our water heater lifespan page is the one to read while yours still works, and our repair or replace page covers the decision when it first misbehaves.
Is 50 gallons the right size?
Fixr: a 50-gallon tank provides enough hot water for families of 3 to 5 people. This Old House, citing The Home Depot, splits it finer: 1 to 2 people need 30 to 40 gallons, 2 to 3 people need 40 to 50, households of 3 to 4 should consider 50 to 60, and families of five or more need more still.
Note that the two overlap rather than agree: a four-person household lands inside Fixr's 50-gallon band and at the bottom of This Old House's 50-to-60 band. Our sizing page works through the recovery-rate question, which matters more than the number on the label if your complaint is running out during back-to-back showers.
How to read a quote for this job
A good quote lists the unit by brand and model, states the warranty length, names labor as its own line, says whether permit and disposal are included, and lists code items separately. If it is one number with no breakdown, ask for one. If it sits below $700, ask what is missing, because that is under the floor of both publishers. Use the replacement cost calculator to assemble the range for your own options.
Sources
- Fixr, 50-Gallon Water Heater Installation Cost, updated January 26, 2026 (the $900 to $2,500 range and $1,800 average, the household size, the installed cost by fuel type, the labor share and range, and the permit and inspection range)
- This Old House, How Much Does Water Heater Installation Cost? (2026), updated June 17, 2026 (the installation cost table by tank size credited to The Home Depot, the $1,950 national average, the unit prices by fuel, the fuel-switching budget, the high-efficiency ranges, the regional differences, and the comment from its plumbing and heating expert)
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.