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How to Install a Tankless Water Heater: DIY Guide
If you're looking into how to install tankless water heater systems, it helps to understand what's involved before the work begins. Even if you decide to hire a professional, knowing the basic steps can make it easier to compare options and ask the right questions.
Tankless water heaters heat water as it moves through the unit instead of storing it in a tank. The installation process includes plumbing connections, venting, gas or electrical work, and local code requirements. Tiger has been serving Central Illinois since 1993 and installs tankless systems for homeowners who want the job done safely and correctly.
How a Tankless Water Heater Works
A tankless water heater heats water only when you need it.
When someone turns on a hot water faucet, shower, or appliance, water flows through the unit and is heated before reaching the fixture. Since there is no storage tank, the system takes up less space and continues producing hot water as long as it stays within its capacity.
Tankless systems are popular in Illinois homes because they provide a steady supply of hot water without the space required for a large storage tank.
Key Steps in a Tankless Water Heater Installation
Choose the Right Location
Picking the right location is one of the first steps.
The unit should be placed near existing water lines, gas service, and venting whenever possible. It also needs enough room around it for safe operation and future service.
Indoor and outdoor units have different installation requirements, so check the manufacturer's instructions before choosing a location.
Turn Off Utilities and Remove the Old Unit
Before removing the old water heater, turn off the gas, water, and electrical supply connected to the system.
The tank should be drained completely before disconnecting any plumbing. Water heaters are heavy, so use caution during removal.
Once the old unit is out of the way, damaged pipes, worn valves, or other plumbing problems are easier to spot.
Mount the Tankless Unit
Most tankless water heaters mount directly to a wall using a bracket supplied by the manufacturer.
The unit should be level and secured according to the installation instructions. Placement matters because it affects venting, pipe routing, and future access if repairs are needed.
Connect Water, Gas, and Venting
This is the step where most DIY projects become more challenging.
The cold-water inlet and hot-water outlet must be connected using approved materials. Some tankless systems require larger gas lines than traditional water heaters.
Gas units also require proper venting. Poor venting can create serious safety concerns, so installation instructions should be followed carefully.
Check for Leaks and Start Up the System
After all connections are complete, inspect the entire system.
Check water lines for leaks, verify gas connections, and follow the startup instructions provided by the manufacturer. Once the system is running, test hot water at several fixtures throughout the home.
Before calling the job finished, inspect everything one final time to make sure the system is operating correctly.
When to Call a Professional for a Tankless Water Heater Installation
Installing a tankless water heater is not always a simple replacement project.
Some installations require:
- Gas line upgrades
- Electrical work
- Venting changes
- Permit applications
- Plumbing modifications
Mistakes during installation can create safety concerns, affect system performance, and create warranty issues.
If the project involves gas piping, electrical upgrades, or significant plumbing work, a licensed plumber should inspect the installation before work begins.
Why Tiger Is the Right Choice for Tankless Installation
Tiger has been serving Central Illinois since 1993, installing and servicing water heaters in homes and businesses throughout the region.
From Bloomington neighborhoods near the McLean County Museum of History to homes around the Peoria Riverfront Museum, our team works with homeowners across the area to install tankless water heaters and keep existing systems running properly.
In addition to tankless installations, we provide water heater repair, water heater maintenance, and water heater replacement services for homes throughout Central Illinois.
Homeowners looking for ongoing maintenance and care can ask about the club membership program.
You can also view our service areas to find the location nearest you.
If you're considering a tankless water heater, contact us today to schedule a consultation.
