Tank & Tankless · Line Sizing · Permits · 24/7 Leak Repair

Gas Water Heater Installation & Line Hookup in Chicagoland

Licensed gas fitters for tank & tankless water heater hookups across Chicago and the suburbs

Swapping out a gas water heater is more than a plumbing job — the gas line that feeds it has to be sized, connected, and pressure-tested correctly to keep your home safe. Our licensed, insured pros handle the gas side cleanly, and we answer the phone 24/7 for callbacks across Chicago and the suburbs.

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When you need a licensed gas fitter (not just a plumber) for a water heater swap

Plenty of homeowners assume a water heater is purely a plumbing job. The hot- and cold-water connections are — but the fuel side is gas-fitting work, and in Illinois that's a separate, licensed trade. When the old tank comes out and a new one goes in, someone has to disconnect the gas, re-pipe the supply if it doesn't match, fit a fresh shutoff and connector, and verify there are no leaks before the unit ever fires.

That's where we come in. A general plumber can handle the water lines, but the gas connection should be made by a licensed gas fitter who pulls the permit and stands behind the work. We coordinate the whole gas side of your install or repair — the same crews who do our gas appliance hookups for ranges, dryers, and furnaces. If you ever smell gas near the heater, that's not a wait-and-see moment: leave the house and call 911 or your utility first, then call us once it's safe.

Sizing the gas line — 1/2" vs 3/4" and BTU load for tank vs tankless

The single most common mistake we fix on water heater jobs is an undersized gas line. Every appliance has a BTU rating — the amount of fuel it can burn per hour — and the pipe feeding it has to deliver enough gas to meet that demand at the right pressure. Run too small a line and a hungry heater starves, short-cycles, or won't keep up with hot-water demand.

  • Standard gas tank heaters typically run around 30,000–50,000 BTU. A properly run 1/2" line is often adequate for a short, dedicated run, but length and other appliances on the same branch matter.
  • Tankless gas water heaters are a different animal — many demand 150,000–199,000 BTU because they heat on demand. That almost always calls for a dedicated 3/4" line back to the meter, and sometimes a meter upgrade.

Sizing isn't guesswork. We calculate the BTU load, pipe length, and number of fittings, then size accordingly — the same engineering behind our gas line installation work. Get a written quote — every home is different.

Standard tank vs tankless gas water heater hookup

A standard tank swap is the more familiar job: we drain and disconnect the old unit, set the new tank, and reconnect the gas with a fresh shutoff valve, a sediment trap (sometimes called a drip leg — a short capped section that catches debris before it reaches the burner), and a code-approved connector. If your existing line is the right size and in good shape, the gas hookup is straightforward.

A tankless gas water heater hookup is a bigger lift. Beyond the larger 3/4" gas line, tankless units need specific venting and often a condensate drain, and the higher BTU draw can affect every other gas appliance in the house. We handle the gas supply and connection; your installer or plumber typically sets the unit and manages venting and water lines. We're glad to coordinate so the gas side is ready the day the heater goes in. For a deeper walkthrough, see our guide to water heater gas piping replacement.

Permit + pressure-test requirements in Cook, DuPage, Lake & Will counties

Gas work that involves new or altered piping generally requires a permit and an inspection — and yes, that applies to water heaters in most Chicago-area jurisdictions. The exact rules vary by municipality: Cook County towns like Oak Park and Evanston, DuPage communities such as Naperville and Hinsdale, plus Lake and Will County suburbs each run their own permit desks and inspection schedules. We pull the permit, do the work to code, and meet the inspector.

Before any line is reopened, we run a gas pressure testing check to prove the piping holds. New or modified gas piping is capped and pressurized, then watched on a gauge for a set period — if the needle holds, it's tight; if it drops, there's a leak to find and fix before gas flows. We also call JULIE (811) for a dig-locate any time work goes underground, so no buried utility line gets nicked. Whether you're on Peoples Gas in the city or Nicor out in the suburbs, the safety steps are the same.

What a typical install costs (gas-line work only vs full swap)

Cost depends on what your home actually needs, so we quote in ranges rather than throwing out one number. A clean, code-ready hookup — connecting a new tank to an existing, correctly sized line with a fresh shutoff and connector — sits at the lower end. Re-piping a run, upsizing from 1/2" to 3/4" for a tankless, relocating the line, or adding a sediment trap adds labor and materials.

  • Gas-line work only (you already have the heater set, or another trade handles the unit): repairs and minor connections start from $199, with larger re-pipes running higher.
  • Larger jobs — new dedicated tankless lines, meter coordination, or runs across a finished basement — are priced after we see the layout.

Permit fees are set by your village and are separate. We'll walk you through exactly what your job involves before any work starts. Get a written quote — every home is different.

24/7 emergency water heater gas-leak repair

A gas water heater that's leaking fuel — not water — is an emergency. If you smell that rotten-egg odor near the unit, hear a hiss, or your detector goes off, get everyone out of the house first, leave the door open, and call 911 or your gas utility (Peoples Gas in the city, Nicor in the suburbs) from outside. Don't flip switches or light anything. Once the immediate danger is handled, we take over the private-side repair.

We answer the phone around the clock and dispatch a licensed pro, with a typical 30–60 minute response across our service area — from Arlington Heights and Schaumburg to Joliet, Bolingbrook, and Oak Brook. Using gas leak detection equipment, we pinpoint whether the leak is at the connector, the shutoff valve, a fitting, or the line itself, then repair it and pressure-test before restoring service. No guesswork, no leaving you with a heater you're afraid to use.

Warranty, venting clearances, and the old flex-connector recall

We stand behind our gas work in writing and pull the permit so there's an inspection record for your home — that paperwork matters when you sell, and it protects your manufacturer warranty, which can be voided by an uninspected or improper installation.

Two things we always check on older homes. First, venting and clearances: a gas water heater needs proper draft and the right distance from combustibles, and a tankless unit has its own venting rules — getting this wrong risks carbon monoxide, not just code violations. Second, the connector itself. Certain older uncoated brass flex connectors were recalled years ago because the coating could react with gas and crack, causing leaks. If we spot one of those legacy connectors during a swap, we replace it with a modern code-approved connector as a matter of course. The same goes for brittle, corroded, or kinked CSST (the flexible corrugated stainless tubing common in newer homes) — if it's compromised, it gets replaced before we sign off.

Service areas for gas water heater installation

Gas water heater installation requests are routed across Chicago and the surrounding suburbs.

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Common Questions

Gas Water Heater Installation FAQs

In most Chicago-area municipalities, yes — water heater work that touches the gas piping generally requires a permit and an inspection. The specifics vary by village across Cook, DuPage, Lake, and Will counties. We pull the permit, do the work to code, and meet the inspector so your install is on record and your manufacturer warranty stays intact.

Most tankless gas water heaters draw 150,000–199,000 BTU and require a dedicated 3/4" gas line back to the meter — sometimes with a meter upgrade. A standard tank heater (around 30,000–50,000 BTU) can often run on a properly sized 1/2" line. We calculate the BTU load and run length before sizing anything, since pipe length and other appliances on the same branch change the answer.

A plumber can handle the water connections, but the gas supply should be connected by a licensed gas fitter who pulls the permit and pressure-tests the work. We handle the gas side of water heater installs and repairs across Chicago and the suburbs, and we're happy to coordinate with whoever is setting the unit itself.

Treat it as an emergency. Get everyone out of the house, leave a door open, and don't flip switches or light anything. From outside, call 911 or your gas utility — Peoples Gas in the city, Nicor in the suburbs. Once the immediate danger is handled, call us at (708) 381-2959 and we'll dispatch a licensed pro to find and repair the leak, then pressure-test before restoring service.

It depends on your home. A clean hookup to an existing, correctly sized line is at the lower end, with repairs and minor connections starting from $199. Upsizing to 3/4" for a tankless, re-piping a run, or relocating the line costs more, and village permit fees are separate. Get a written quote — every home is different.

A sediment trap — also called a drip leg — is a short, capped section of pipe near the appliance that catches debris and moisture before they reach the burner. It's commonly required by code on gas appliance connections, including water heaters. If your existing setup is missing one, we add it as part of bringing the connection up to code.