Why this is not a weekend DIY job
A water heater holds hot water under pressure and often burns gas. A bad gas connection, a blocked vent or a missing relief valve can cause carbon monoxide, fire or a tank failure. Soldering and gas fitting also need training and tools.
The Village of Woodridge requires a permit and final inspection for a water heater. Plumbing contractors must be licensed under state law, and the Village asks for a copy of the plumber's license. Call Community Development at 630-719-4750 before work begins.
If you ever smell gas, leave the house first. Move a safe distance away and call Nicor Gas on 888-642-6748 and 911 before you call anyone else.
The plumbing layout from top to bottom
Two pipes enter the top of a tank. The cold supply goes to the port marked cold, and a dip tube carries it to the bottom. The hot outlet draws from the top, where the hottest water collects. Mixing these up wastes hot water and can damage the tank.
| Piece | Job | Common mistake |
|---|---|---|
| Cold shutoff valve | Lets you isolate the heater for service | Skipped, or a cheap valve that seizes |
| Flexible connectors or union fittings | Make removal easy later | Kinked, or the wrong type for gas |
| Temperature and pressure relief valve | Opens if the tank overheats or overpressurizes | Capped, undersized or routed upward |
| Discharge pipe from the relief valve | Carries hot water to a safe spot | Ends near the floor with no air gap, or is plugged |
| Expansion tank | Absorbs pressure when water heats up | Left out of a closed system |
| Drain pan and drain line | Catches leaks | Missing in an upstairs or finished space |
Each of these pieces protects the home. Leaving one out to save time is the typical shortcut.
The installation in order
- Shut off the water supply, turn off the gas or breaker, drain the old tank and disconnect it.
- Move the new tank into position on a level base, inside a pan if the space calls for one.
- Connect the cold line to the cold port and the hot line to the hot port, with a shutoff on the cold side.
- Install the relief valve and run its discharge pipe full size down to a safe, visible spot.
- Add an expansion tank where the system needs one.
- Connect gas with a shutoff valve and sediment trap, or wire the electric supply, then fit the vent.
- Fill the tank with a hot tap open so air escapes, then check every joint for leaks.
- Test the burner, draft and gas joints, then schedule the inspection.
Gas, venting and electrical are their own steps
A gas heater needs a correctly sized gas line, a shutoff valve and a leak test at every joint. The vent must carry exhaust outside and slope or rise as the maker specifies. A weak draft can push carbon monoxide into the living space, so plumbers test it before leaving.
An electric heater needs a dedicated circuit with the right breaker and wire size. That is a job for a licensed electrician when a new circuit is needed. The Village lists all electrical and plumbing work as permit-required.
Swapping a heater of the same size is simpler than changing fuel type or location. Switching from a tank to a tankless unit changes the gas line, the vent and sometimes the electrical supply, so plan for more work.
Water heaters in Woodridge homes
About seven in ten Woodridge homes are at least 35 years old, based on census-based estimates, with the median built in 1980. Original shutoff valves, unions and water lines in those houses are often worn, so replacement is a good time to refresh them.
The Village's permit FAQ says a permit and final inspection apply to water heaters. Community Development is at 5 Plaza Drive, open Monday to Friday, 8 a.m. to 4:30 p.m. Our team pulls the permit as part of the installation and arranges the inspection. The Village permit FAQ lists the details.
The Village has adopted the Illinois State Plumbing Code with local amendments, so a layout that works in another state may not pass here. You can confirm a plumber's license through the IDPH verification tool.
What changes across the border
Water service differs from town to town. In Bolingbrook, Illinois American Water, not the Village, handles water service. In Lisle, the Village buys Lake Michigan water but Illinois American Water serves the Oakview neighborhood, so a pressure problem may belong to a different utility depending on the address.
A new heater is usually part of broader plumbing installation work when lines or fixtures change. For a standard tank swap, our water heater installation team handles the connections, gas, venting and permit paperwork, and we state a clear price before work starts.
Have a licensed plumber do the connections
Call the 24/7 line and we will explain the job, handle the permit and state a clear price before work starts.
Questions we hear
Ports are marked on the tank top. Cold feeds in and hot comes out. Check the labels and never guess, since reversed lines can damage the tank.
Many closed systems do, because heated water expands and has nowhere to go. A plumber checks your system and recommends one if needed.
We advise against it. Gas joints, shutoff valves and venting must be tested, and a mistake can cause leaks or carbon monoxide.
Yes. The Village requires a permit and final inspection for a water heater. Call Community Development at 630-719-4750.
If it opens, scalding water and steam come out. The pipe directs that to a safe spot instead of onto people or floors.
A same-size tank swap is often a single visit. Moving the heater, changing fuel or adding venting can take longer.
Leave the gas, venting and permit steps to a licensed plumber.