The short answer, and what stretches it
Most tankless installs in Shelbyville, Indiana take about one working day when the new unit goes where the old tank stood and the gas line, vent and wiring already suit it. Add a new vent run, a bigger gas pipe or a panel upgrade and the job often becomes two visits.
Inspection timing also matters, and no plumber controls it. Removing the old tank is the quick part. Hanging, venting and commissioning the tankless unit is where the hours go. Gas piping, venting and permits all follow the Indiana Plumbing Code and the maker's installation standard, and that is where most schedule slips come from.
| Scenario | Usual pace | What decides it |
|---|---|---|
| Electric tank to electric tankless | Most of one day | Heavy-gauge wire, a dedicated breaker and open panel space |
| Gas tank to gas tankless, same spot | One full day, sometimes a second visit | Gas pipe size, a new stainless or PVC vent, a condensate drain |
| Gas unit moved to a new wall | One to two days | Longer vent path, wall penetrations, extended gas and water lines |
| Old tankless to new tankless | Often under a day | Same mounting area, isolation valves already in place |
| Add a recirculation return line | A few extra hours | Opening walls, fittings, extra pressure testing |
Install day, step by step
Walk-through and shutoffs
The plumber confirms the model, shuts off water and gas or power, and checks the vent path and the gas meter size against the unit's rating. Nothing gets cut until that matches.
Drain and haul out the tank
A garden hose carries the tank water to a floor drain or outdoors. Draining a 40 or 50 gallon tank takes a while, and the heavy steel shell comes out last.
Mount the unit and run the vent
Tankless units hang on a wall plate. Gas models need sealed venting, often stainless or PVC, run through the wall or roof with the right slope and clearances.
Connect water, gas or power
Isolation valves go on the hot and cold lines so the unit can be flushed later. Gas lines get a sealed fitting and a leak test. Electric models are wired to their own breaker.
Fire it up and test
The plumber purges air, checks flow, reads gas pressure or amp draw, sets the temperature and runs hot water at several fixtures. A final walk-through covers the first flush schedule.
Why gas jobs run longer than electric swaps
Gas tankless
- Needs a sealed vent, often a new hole through the wall
- Older gas lines may be too small for the burner's demand
- Condensate drain required on high-efficiency units
- Gas leak test adds time at the end
Electric tankless
- No vent, so the wall work is small
- Wire size and breaker rating decide the day
- A licensed electrician handles any panel upgrade
- Wiring work is the main step to schedule separately
Gas line sizing, leak testing and appliance venting follow the National Fuel Gas Code (NFPA 54) and the maker's installation manual. That is why the plumber checks the meter size and the vent table before cutting anything, and why a gas job can need a second visit.
If you smell gas at any point
Leave the house, do not flip switches, and call 911 and your gas utility from outside. Do not relight a pilot or test a fitting with a flame. A gas smell during an install means the work stops until a licensed plumber and the utility clear it.
Permits and inspections in Shelbyville
The City of Shelbyville says only plumbing contractors can apply for and obtain plumbing permits, and homeowners working on a home they own and live in must get a permit before starting any work. The city's Planning and Building page says building-type permits typically take 3 to 5 days.
That 3 to 5 day figure is for building, improvement location and right-of-way permits, so ask the building department what applies to a water heater swap. Permit rules vary outside city limits, so ask the building department for your town. If your plumber pulls the permit before the install date, the wait does not stretch your day.
Source type: City of Shelbyville Permits Contractors and Planning and Building pages
Want a real timeline for your house?
Tell dispatch your current heater, the fuel and where it sits. A plumber can tell you what to expect before the work is booked.
Prep that keeps the day on schedule
Safety checklist for the night before install day
Small things add an hour when they are missed.
- Clear a 3 foot path to the old tank and the new wall space
- Move stored boxes away from the vent and gas meter side
- Locate the main water shutoff and make sure it turns
- Note the current heater's make, fuel and age
- Confirm any HOA or landlord approval for wall penetrations
- Plan for no hot water until the unit is tested
Replacing a failed tank on a cold morning is a different pace from a planned upgrade. If the old tank has already failed, our water heater replacement crew can talk through a like-for-like tank swap that finishes sooner. Tankless remains a planned choice with more parts.
We dispatch to homes across Shelby County, including Fairland and Waldron. Outlying addresses mean a longer drive, not a different install process.
Tankless timeline questions from Shelby County homeowners
In most like-for-like jobs, yes. The plumber tests the unit before leaving, and you should have hot water by the end of the visit. A job that needs a second visit for venting or electrical work leaves you without hot water in between, so ask about a temporary plan.
A tank sits on the floor and vents through an existing flue. A tankless unit hangs on a wall and often needs a new sealed vent, a larger gas line, and a condensate drain. Each of those adds fitting, sealing and testing time.
Only if the unit, vent and gas or electric supply already suit it. A failed tank at night usually gets a fast tank swap instead, with tankless planned later. Call the 24/7 line and describe what is leaking.
Often yes. These units draw heavy current and may need a dedicated breaker and new wire. Hire a licensed electrician for any panel or wiring work. Do not try it yourself.
Rotted shutoff valves, an undersized gas line, a vent route blocked by framing, or a failed leak test. Old galvanized pipe can also snap when disturbed. A walk-through before the install date catches most of these.
The City of Shelbyville says only plumbing contractors can apply for and obtain plumbing permits, though homeowners working on their own residence must get a permit before any work. Outside the city, permit rules vary, so ask the building department that covers your address.