The gas-specific items that move the price
An electric tank needs water and power. A gas tank needs those plus a fuel line, an exhaust path and enough air to burn. Each extra item can add parts or labor.
- Venting A tank with a natural draft vent uses a metal flue that rises through the roof. A power vent or condensing model exhausts through plastic pipe out a side wall and needs electricity for its fan.
- Gas line The line must be the right size for the new burner, with a shutoff valve, a sediment trap (a short vertical drop that catches debris) and a flexible connector that is leak tested.
- Combustion air A heater in a tight closet or a sealed utility room can starve for air. Louvered doors or ducts may be needed to bring it in.
- Tank size and type A 50-gallon tank costs more than a 40-gallon one, and a power vent costs more than a standard draft model. DOE lists storage tank lifespans at 10 to 15 years, so the model you buy is a long-term choice.
- Safety and code parts A new temperature and pressure relief valve with a discharge pipe, and often an expansion tank, because water expands when heated and a closed system has nowhere to put it.
- Permit and haul-away Permit fees, if your project needs a permit, and removal of the old tank, which is heavy and awkward on stairs.
Why the vent can change everything
The exhaust path is the biggest single variable. If the old heater has a natural draft flue and the new one is the same type, the flue pipe is often reused. It still needs a check for rust, gaps and proper slope toward the vent cap.
Swap to a power vent and the picture changes. You need a new plastic vent run to an exterior wall, a nearby outlet, and sometimes a drain for condensate. That added labor and material is why two quotes for the same tank size can differ so much.
Same-type swap or a change of type?
Ask your plumber which of these rows describes your job. It tells you how much gas-side work to expect.
| Scenario | Gas-side work | Why the quote changes |
|---|---|---|
| Draft tank replaced with a draft tank | Reconnect gas, check flue, new relief valve | Least new material, mostly labor and the tank |
| Draft tank to power vent | New plastic vent run, outlet for the fan, flue capped | Extra pipe, wall penetration and electrical |
| Tank to tankless gas | Larger gas line, new vent, condensate drain | Often the biggest change, since the gas line and vent are both redone |
| Heater moved to a new spot | New gas, water and vent runs | Every connection is rebuilt |
| Same spot, tighter closet than before | Combustion air openings added | Code and safe burning both depend on air supply |
A written quote should name which row applies. If it says only water heater replacement with no mention of venting or gas, ask what is assumed. For the tankless route, see our tankless water heater page.
Want a licensed plumber to look at it?
Call the 24/7 line and describe what you are seeing.
Gas smell or a possible CO problem
A gas smell means you act first and diagnose later. Do not touch switches or flames. Get everyone out, then phone the gas utility or 911 from outside, and stay out until it is cleared.
Carbon monoxide gives no warning smell. The CPSC recommends battery-operated or battery-backup CO alarms placed on each floor and just outside bedrooms, ideally linked together. Test yours when any gas appliance work is on the calendar, and swap dead batteries.
How to read a gas water heater quote
Put every quote next to the others and check these items line by line.
Tank size and type
Gallons, draft or power vent, and whether it matches the old one. A cheaper quote may be a smaller tank or a different vent type.
Venting scope
Does it reuse the existing flue or install new pipe? Who patches the wall or roof if a hole is cut?
Gas connection
New shutoff valve, sediment trap and connector, and a leak test with the result stated.
Safety parts
Relief valve and discharge pipe, expansion tank if needed, and the pan or drain if the heater sits above finished space.
Permit and haul-away
Whether the quote covers permit paperwork and removal of the old unit.
Warranty
What the tank warranty covers versus what the labor warranty covers, in writing.
Repair the old gas heater or replace it?
Age is the first clue. DOE lists storage tank water heaters at 10 to 15 years, so an old heater with a new problem is a different decision than a younger one.
Repair makes sense when
- The tank is not leaking and is within its expected life
- The fault is a thermocouple, gas control valve or igniter
- The anode rod or relief valve is the only worn part
- Water is hot but runs out sooner than before
Replace makes sense when
- Water is seeping from the tank body or seams
- The unit is at or beyond 10 to 15 years
- Rusty water comes from hot taps only
- Repair parts would cost close to a new unit
What about rebates and tax credits?
The IRS lists a federal home improvement credit for heat pump water heaters at 30 percent of costs up to $2,000 per year, and says it ends after 2025. Gas tanks are not what that page describes, and the credit is not available for work done in 2026.
Do not budget around it. Ask your gas utility whether it runs any current rebate program, and ask your tax professional about anything you plan to claim.
Insurance and the failed unit
Homeowner policies tend to respond to sudden, accidental water damage, like a tank that splits and soaks a finished basement. They tend not to pay for the heater itself, slow leaks or wear. Your policy wording decides, so check it and ask your agent.
If the tank leaks, close the cold supply valve above the heater and turn the gas control to off. Photograph everything before you mop up. Photos help any claim and help the plumber.
When to call a plumber and what you should not do yourself
Gas work is not a place to learn on the job.
- Safe to do yourself Check the temperature setting, look for puddles, flush a few gallons from the drain valve, and read the label for the age.
- Call a licensed plumber Any gas connection, venting change or relief valve work. A bad connection can leak gas, and a bad vent can send exhaust into the house.
- Verify the license Before anyone touches the gas line, look the plumber up in the state's online license verification, which lists Indiana professional licenses.
What this means in Zionsville
Building permits in town go through the Zionsville Planning & Building Department on Oak Street, which keeps weekday hours of 8 a.m. to 4 p.m. Whether a like-for-like tank swap needs one is a question for that office. Learn the answer while you compare quotes, not after the old tank is out.
Indiana's plumbing code is the Indiana Plumbing Code, 675 IAC 16-1.4, last updated in 2012 by the state's Fire Prevention and Building Safety Commission. Your installer works to that code, so ask them to name the items on your quote that it drives, such as the relief valve and discharge line.
NWS Indianapolis puts the normal January average low at 20.9 F. A heater that fails in that month leaves you without hot water at the worst time, so replacing a tank that is past 10 years on your own schedule beats waiting for it to fail.
Serving nearby towns
We replace and install heaters in Whitestown and Boone County as well. If you are checking whether we reach your street, see our service areas. For a first look at a heater that is not working, read about our water heater repair.
Frequently asked questions
There is no single honest average, because venting, gas line condition, tank size and permits differ by house. A written quote that names each item is the real number. Call for a price based on your heater and the space it sits in.
It needs a plastic vent run to an outside wall and electricity for the fan, and many models need a condensate drain. That adds material and labor that a draft unit with an existing flue does not need.
Permit rules vary by project, so ask the Planning & Building Department in Zionsville before work starts. Have the heater type and any vent or gas changes ready when you call.
DOE lists storage tank water heaters at 10 to 15 years. Sediment, water quality and maintenance affect where in that range yours ends up.
The CPSC recommends battery-operated or battery-backup alarms on each floor and outside sleeping areas, ideally interconnected. Test yours and replace any that are old or silent.
If it is a simple pilot relight and you follow the label, many homeowners do. If it keeps going out, smells of gas or shows soot, stop and call a licensed plumber.
Sources
Figures and guidelines on this page are taken from these public sources. Local rules and utility details can change, so check the source before you rely on a number.
- DOE lists storage tank water heater lifespans at 10 to 15 years (Federal agency)
- CPSC CO alarm placement advice (every level, outside sleeping areas, interconnected) (Federal agency)
- Zionsville Planning & Building Department, 1100 W Oak St, permit review, Mon-Fri 8 a.m. to 4 p.m. (Local government)
- Indiana Plumbing Code 675 IAC 16-1.4 adopted and updated in 2012 (Agency)
- Indianapolis normal January average low 20.9 F (Federal agency)
- Federal credit covers heat pump water heaters and ends after 2025 (Federal agency)
- State online license verification (Agency)