The ranges, and how to read them
Start with the numbers we use on the phone. A like-for-like gas or electric tank, 40 to 50 gallons, in a spot where the plumber can reach everything, is estimated at $1,400 to $2,900. A tank that needs code updates or sits in an attic is estimated at $2,200 to $3,800. A hybrid heat pump tank runs $3,000 to $5,500, and converting from a tank to tankless is $3,800 to $7,500.
Those are ranges, not quotes, and the gap inside each one is real. A $1,500 job and a $2,800 job can both be called "replacing a 40 gallon gas tank" and still be completely different afternoons. The rest of this page is about what pushes a job from one end of the range to the other, because that is the part nobody explains when you ask for a price over the phone.
Why two houses on the same street get different numbers
Take two homes in Waterview, built the same year by the same builder. One keeps its heater on the garage wall, six feet from where the gas comes in. The other has it in an upstairs closet over the kitchen. The garage job is a swap: old tank out, new tank on the same stand, same vent, same connections. The closet job needs a drain pan with a line to somewhere sensible, a longer relief pipe, and usually a second person to carry a full-size tank up a staircase.
Four things move the price more than anything else:
- Where the heater sits. Ground-floor garage is the cheapest. Attic and upstairs closets cost more because of access, the pan and the drain line.
- What fuel it runs on. Gas jobs carry a vent and a gas connection to check. Electric jobs carry a circuit to check. Neither is hard, but each is a line item.
- What the old install is missing. A twelve-year-old install often has no expansion tank, a tired shut-off valve, and a relief line that stops two feet short of the floor.
- Whether you're changing the type. Staying with a tank keeps everything in place. Going tankless or hybrid changes the gas line, the vent, the circuit or the drain.
None of that is a trick. It's the same plumbing, just more or less of it.
What a decent quote actually lists
Ask for the price in writing before anyone touches the old heater, and read what's in it. A good quote names the new unit by size and fuel, then lists the labor, any permit, the code items and the haul-away as separate lines. You should be able to point at each line and ask what it is.
The code items are where quotes quietly differ. An expansion tank, a drain pan, a new cold-side shut-off, new flex connectors and a relief line run to a safe spot are all things a current install should have. If one quote has them and another doesn't, you're not comparing the same job. The cheaper one hasn't found a bargain; it has left something out, and either you pay for it later or the house does.
Removal matters too. A 50 gallon tank weighs a good deal even empty, it has to be drained first, and somebody has to take it away. Plenty of quotes assume you'll deal with it. Ours doesn't; the old heater leaves with us.
Why tankless costs what it costs
The unit itself is part of it, but the bigger part is the house. A gas tank burns 30,000 to 40,000 BTU an hour. A whole-house tankless unit can ask for 150,000 to 199,000. The half-inch gas line that fed the tank is often too small for that, so the line gets upsized, sometimes from the meter. The flue changes as well, because a tankless unit needs its own vent rather than the old tank's chimney-style flue, and condensing models also need somewhere for their drain water to go. Add a spot on the wall, a plug for the electronics, and valves so the unit can be flushed later, and $3,800 to $7,500 starts to look about right.
If you're weighing it, the tankless installation page and the tank-to-tankless conversion page go through what changes in the house, and the tank versus tankless comparison covers whether it's worth it for your household.
Hybrid heat pump tanks: pay more now, spend less each month
A hybrid unit costs more than a standard electric tank because it carries a heat pump on top. The trade is a lower running cost, since the heat pump moves heat out of the surrounding air instead of making all of it with an electric element. That only makes sense in the right spot: a roomy garage or utility room with open air around the unit and a place for the condensate to drain. Put one in a closet and it will sulk.
If your house is all-electric and the garage has space, it deserves a quote. If gas is already piped to the heater, the extra up-front cost may take a long time to pay back, and a gas tank is the simpler answer. There's more in the hybrid heat pump installation page.
When the cheaper quote isn't cheaper
The classic version goes like this. Three quotes come back, one low, one in the middle, one high. The low one is for a tank with the bare minimum of connections and no haul-away. The middle one adds a new shut-off and takes the old tank. The high one adds an expansion tank and a drain pan because the closet is upstairs. By the time the low quote has been patched up with the missing pieces, it isn't the cheapest any more.
The other way a low number goes wrong is size. A 40 gallon tank is cheaper than a 50, and if the household has four people and two bathrooms that run at the same time, you'll save a little at purchase and spend the next ten years running out of hot water. Ask what size they're quoting and why.
A worked example, in plain terms
Imagine a two-story house in north Rowlett from the early 2000s with a 50 gallon gas tank on the garage wall. It's twelve years old, it has started to weep at the base, and the household is four people. The vent is in good shape and the gas shut-off is fine, but there's no expansion tank, the relief pipe stops a couple of feet above the floor and the cold-side shut-off is stiff.
That job is a like-for-like swap with a few code updates. It lands in the middle of the $1,400 to $2,900 range for a tank, because the heater is in the easy spot but the install around it needs bringing up to date. The quote would list the new 50 gallon unit, the labor, the expansion tank, the new shut-off and connectors, the relief pipe, the permit where required and the haul-away.
Now move the same heater to an upstairs closet with no pan. The unit is the same, but the job picks up a drain pan, a drain line, a longer relief pipe and some awkward carrying, and it moves toward the $2,200 to $3,800 range. The house is the same age and the household the same size. The difference is entirely where the heater sits, which is why we ask about it first.
Ways to lower the bill without cutting corners
There are honest ways to spend less. Replace the heater like for like when nothing about the household has changed, because that's the cheapest job there is. Keep the heater where it is; moving it adds pipe, and sometimes a vent or a circuit. Do the swap on your own schedule rather than after the tank has failed, since an emergency usually means whatever unit is on the shelf, not the one that fits best, and a flooded garage costs more than any heater.
Check the date on the label before you call. If the tank is only five or six years old and the problem is a part, a repair may be the better spend, and you should be told that. A tank at ten or eleven years old is a different conversation, and the signs of a failing heater are worth a read.
If you're in a house rebuilt after the December 2015 tornado, there's a good chance your heater is nearing that age. The post on rebuilt Rowlett homes explains how to check.
What happens on the call
You tell us three things: the age, the size and the fuel of the old heater, and where it sits. From that we can give you an estimated range straight away. If everything is straightforward, the written quote can follow on the day, after a quick look at the vent or the circuit and the water side. No price is firm until that look has happened, and nothing is started until you've seen the figure on paper. That's the whole process, and it's the one on the water heater replacement page.