How to read a water heater replacement quote
The lines a real quote includes, and what a missing permit, pan, vent, or expansion tank usually means.
A water heater quote is not a single number. A usable quote names the model, the first-hour rating or the tankless flow at your temperature rise, and every line required to leave the heater legal: vent or circuit, pan, expansion tank, permit, haul-away, and who warrants the labor.
If the paper in your hand is a brand, a gallon size, and a total, you do not have a quote yet. You have a guess. This page is the list to set beside two bids. The published national ranges those bids should be compared with, labeled as ranges and not as your price, are in what water heaters cost.
The model line
The model number has to be specific enough to look up. “50-gallon gas” is not a model. You need the first-hour rating for a tank, including a heat pump, from the EnergyGuide or the spec sheet.
The Department of Energy’s method is to match that rating to the busiest hour, within about one or two gallons.
The worksheet is how to size a tank.
For tankless, you need gallons per minute at the rise your winter inlet actually requires, not the flattering column. That method is how to size a tankless heater. If the quote cannot say which cell of the chart it used, the installer has not sized it.
Fuel and vent category belong on the same line: atmospheric, power vent, or condensing. An atmospheric price that assumes the old metal flue, attached to a condensing model that cannot use it, is a different project.
Condensing gas heaters is the reason. Brand is the last item on this line, not the first. How the major brands differ is about parts and channels, not a ranking.
The lines that change the total
| Line | What it covers | What “not included” usually means |
|---|---|---|
| Permit and inspection | The city looking at the vent, gas or circuit, and relief pipe | You may be the one who finds out later, at resale or after a leak |
| Pan and pan drain | Where a leak would damage the building | The price assumed a garage slab, or it forgot the code |
| Relief-valve discharge | Full-size pipe, downhill, no cap, visible end | The old illegal pipe is being reused |
| Expansion tank | Closed systems with a check valve or pressure reducer | The new relief valve will drip, and you will pay again |
| Vent or chimney work | The path the new listing allows | Atmospheric reuse priced onto a condensing unit |
| Gas line or regulator | Enough input at full fire, especially tankless | The old 40,000 Btu line is being asked to feed 199,000 |
| Electrical circuit | Nameplate breaker and wire | A heat pump or a larger element on the old cable |
| Isolation valves | Tankless descale without cutting pipe | Next year’s maintenance is a plumbing call |
| Haul-away and new connectors | The old tank leaves, the dielectric joints are new | The old tank stays in the driveway and the old flex stays |
| Labor warranty | Often one year, from the installer, not the factory | “12-year warranty” was the tank, not the visit |
| Rebate, if any | A named program you can open | A 2026 “federal tax credit” that the IRS ended |
The permit, the pan, and the relief pipe are not decoration. Permits, pans, and straps is the orientation, and the inspector is the authority. A low bid that skips them is not comparable to a bid that includes them.
Seismic straps belong on the list where the region requires them. A garage stand belongs on the list only if the heater is not listed flammable-vapor resistant or the city still wants the stand.
Do not pay for an 18-inch stand “because code always requires it.” Often, on a modern gas heater, it does not.
Two numbers that are not the same job
Imagine quote A at $1,400 for a “50-gallon gas replace” and quote B at $2,600 for a named 40-gallon atmospheric model with a first-hour rating, a pan and drain, a new relief discharge, an expansion tank, a permit, and haul-away.
Quote A can be the expensive one once the missing lines appear, or it can be a like-for-like in a garage that already has a legal vent and no closed system. You cannot tell from the totals. Ask A to itemize. If they will not, you have one quote.
The same trick shows up on tankless paper. A $1,800 tankless price and a $3,400 tankless price may be the same heater with and without the gas line and the vent. Angi’s 2026 published installed band, about $1,404 to $3,902, is wide for that reason.
It is a typical range from an estimator, not a target. HomeAdvisor’s 2025 tank band, about $600 to $2,500, is the same kind of number. Use them to ask why a bid sits outside, not to demand that it sit inside.
Rebates get their own honesty test. A 2026 bid that subtracts a $2,000 federal tax credit is wrong under the IRS rule for section 25C.
A bid that subtracts $1,750 for a state electric rebate might be right, and only after that program has reserved it, and generally not for a gas-to-electric swap under DOE Program Notice 26-2. Heat pump rebates in 2026 is the longer version. Until the reservation exists, compare the quotes at full price.
Tankless quotes hide a second small part. If the house has hard water, the price of isolation valves and a first descale belongs on the paper, or the “lower operating cost” arrives with a whistling heat exchanger in year three.
Hard water and scale is how to know whether that line is optional. On a soft city supply it may be a later job. On a well at ten grains or more it is part of the install.
Labor, license, and the old heater
Ask who pulls the permit and for the license number before the old tank is disconnected. When to call a pro is why a handyman price on a gas vent is not a bargain. Ask what happens if the tank port is too corroded for the repair you thought you were buying. A repair that becomes a replacement should be a second conversation, with both prices, which is the point of repair or replace.
Before anyone leaves, measure the hot tap with a thermometer. The Consumer Product Safety Commission’s scald guidance is why “the dial looks medium” is not a checkout. Temperature and scalding has the times. A new heater left at a dangerous set point is a completed invoice and an unfinished job.
Keep the itemized quote, the permit card, the model, the serial, and the warranty registration date with the manual. The tank warranty you paid for is a PDF plus proof, not a memory of what the salesperson said the brand “usually” covers.
Sources
U.S. Department of Energy, Energy Saver, “Sizing a New Water Heater,” for first-hour rating and tankless flow as the capacity lines a quote should state. International Code Council code notes and IRC water-heater provisions, as adopted locally, for pan and relief-discharge items summarized in the permits guide.
Internal Revenue Service, Energy Efficient Home Improvement Credit, for rejecting a 2026 section 25C discount. HomeAdvisor 2025 and Angi 2026 published ranges, as cited in the cost guide, for the width of national installed bands. U.S. Consumer Product Safety Commission publication 5098, for the temperature check at the end of the job.