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4 months ago
Introduction
Thinking about replacing your traditional water heater with a tankless system? A tankless water heater can be an attractive option for homeowners who want on-demand hot water, a more compact system, and potentially lower standby energy losses.
However, switching from a traditional tank water heater to a tankless model is not always a simple equipment replacement. Your home's existing gas supply, venting, electrical connections, plumbing, and hot-water requirements may need to be evaluated before installation.
So, can you replace a traditional water heater with a tankless system? Yes, many homes can be converted, but the existing plumbing and utility setup must be suitable for the new equipment.
In this guide, we'll explain what homeowners should know before planning a tankless water heater conversion in DuPage County, IL.
Can You Replace a Traditional Water Heater With a Tankless System?
Yes. A traditional storage water heater can often be replaced with a tankless water heater.
The two systems work differently:
- Traditional water heater: Stores a quantity of hot water in an insulated tank and reheats it as needed.
- Tankless water heater: Heats water as it flows through the unit when a hot-water fixture is used.
Because tankless systems heat water on demand, they do not need to maintain a large storage tank of hot water. However, they require sufficient heating capacity to handle your home's hot-water demand.
A successful conversion depends on selecting the right equipment and confirming that your home can support its installation requirements.
Also Read: 7 Common Tankless Water Heater Problems and When to Call a Plumber
7 Important Things to Check Before Converting to a Tankless Water Heater
Before replacing your existing water heater, a professional plumber should evaluate several parts of your home's plumbing and utility systems.
1. Existing Gas Line Capacity
Gas-fired tankless water heaters can require a higher gas input than traditional storage water heaters.
Your existing gas line may not be large enough to supply the new unit while supporting other gas appliances in your home.
A professional should evaluate:
- Existing gas pipe size
- Distance from the gas meter to the water heater
- Total gas demand from other appliances
- Required gas pressure
- Manufacturer's gas supply specifications
Depending on the results, your home may need gas piping modifications or an upgraded gas supply.
Do not assume that the gas line used by your traditional water heater will automatically support a tankless model.
2. Venting Requirements
Venting is another important consideration when converting to a gas tankless water heater.
Traditional tank water heaters and tankless models may use different venting systems. Your existing chimney or vent pipe may not be compatible with the new equipment.
Depending on the selected model, installation may require:
- New exhaust venting
- A dedicated air intake
- Approved vent materials
- Proper vent termination locations
- Required clearances from windows and other openings
The venting system must follow the manufacturer's installation instructions and applicable local building and mechanical codes.
3. Electrical Requirements
Even gas-powered tankless water heaters may need electricity to operate their electronic controls, ignition systems, and internal components.
Before installation, the available electrical supply should be checked against the selected unit's requirements.
Electric tankless water heaters have different electrical demands and may require substantial electrical capacity.
If your existing electrical setup is insufficient, modifications may be necessary.
4. Hot Water Demand and System Sizing
Choosing the right tankless water heater size is essential.
Unlike a storage tank, a tankless system must heat water as it flows through the unit. Its performance depends on how much hot water your household needs at the same time.
A plumber should consider:
- Number of bathrooms
- Number of household members
- Showers and faucets used simultaneously
- Washing machine and dishwasher demand
- Required water temperature
- Incoming groundwater temperature
- Desired hot-water flow rate
For example, a home that regularly uses two showers while running another hot-water fixture may need a higher-capacity system than a smaller household.
Proper sizing helps prevent insufficient hot-water flow and uncomfortable temperature changes.
5. Plumbing Connections and Water Quality
The existing hot and cold water connections should be inspected before conversion.
The installation may require adjustments to water piping, shutoff valves, isolation valves, and other connections.
Water quality is also important. Mineral deposits can accumulate inside a tankless water heater's heat exchanger, particularly when water contains higher mineral levels.
A professional may recommend appropriate water treatment or regular descaling based on the manufacturer's requirements and your home's water conditions.
6. Condensate Drainage
Some high-efficiency condensing tankless water heaters produce condensate during operation.
This moisture needs to be collected and discharged through an appropriate drainage arrangement.
Depending on the equipment and installation location, a condensate drain or other approved disposal method may be required.
The drainage arrangement must follow manufacturer instructions and applicable local requirements.
7. Installation Space and Location
Tankless water heaters are generally more compact than traditional storage tanks, but the selected unit still needs suitable installation space.
A plumber should check:
- Available wall space
- Access for future maintenance
- Required installation clearances
- Venting route
- Water and gas connection locations
- Electrical access
- Condensate drainage, when applicable
In some homes, moving the water heater to a different location may make installation easier, but it can also increase the amount of work required.
Also Read: How Much Does Tankless Water Heater Installation Cost in Illinois?
Tankless Water Heater Conversion: What Does the Installation Process Involve?
A tank-to-tankless water heater conversion involves more than removing an old tank and connecting a new unit.
Although the exact process varies by home and equipment, a professional installation generally includes the following stages.
Step 1: Inspect the Existing Water Heater
The plumber evaluates the existing system, connections, installation location, and overall condition of the plumbing.
Step 2: Calculate Household Hot-Water Demand
The appropriate tankless capacity is determined by considering simultaneous fixture use and the required temperature rise.
Step 3: Evaluate Gas and Electrical Supply
The existing utilities are checked to confirm that they can support the selected equipment. Any necessary upgrades are identified.
Step 4: Plan the Venting and Drainage
The installation layout is reviewed to determine the correct venting arrangement and condensate drainage, if required.
Step 5: Remove the Existing Water Heater
The traditional tank is disconnected and removed safely.
Step 6: Install the New Tankless System
The selected unit is installed with the required plumbing, gas, electrical, venting, and safety components.
Step 7: Test and Commission the System
The installer checks connections, verifies safe operation, tests performance, and follows the manufacturer's commissioning instructions.
Required permits and inspections should be confirmed with the local authority before work begins.
How Much Does It Cost to Convert a Tank Water Heater to Tankless?
The cost of a tankless water heater conversion depends on the equipment selected and the modifications required in your home.
There is no single installation price that applies to every property.
Common cost factors include:
- Tankless water heater brand and model
- Unit capacity and fuel type
- Existing gas line condition
- Gas piping modifications
- New venting materials
- Electrical upgrades
- Condensate drainage
- Plumbing modifications
- Removal and disposal of the existing tank
- Permit and inspection requirements
- Accessibility of the installation area
A straightforward replacement may require less work than a conversion involving major gas line, electrical, or venting modifications.
For a more detailed explanation, read our guide to Tankless Water Heater Installation Cost in Illinois.
The best way to understand your project's cost is to have the existing system inspected and receive an estimate based on your home's actual installation requirements.
Is Converting to a Tankless Water Heater Worth It?
For many homeowners, a tankless water heater can offer useful advantages. However, it is important to consider both the benefits and installation requirements.
Benefits of Tankless Water Heater Conversion
On-Demand Hot Water
Tankless systems heat water when needed rather than storing a large volume of hot water in a tank.
Space-Saving Design
Most tankless models have a compact, wall-mounted design that can free up floor space.
Reduced Standby Heat Loss
Because tankless systems do not continuously maintain a tank of stored hot water, they can reduce standby heat losses.
Potential Energy Savings
A properly selected and installed tankless system may use less energy than a conventional storage system, depending on household hot-water consumption and equipment efficiency.
Long-Term Convenience
With appropriate installation and regular maintenance, a tankless system can provide dependable hot-water service for many years.
Considerations Before Making the Switch
Tankless water heaters are not automatically the best choice for every home.
Keep these factors in mind:
- Initial installation costs may be higher.
- Existing gas lines may require modifications.
- New venting may be necessary.
- Electrical requirements must be checked.
- The unit must be sized for simultaneous household demand.
- Regular maintenance and descaling may be necessary.
- Hot water is not necessarily delivered instantly to distant fixtures.
Consider your household's hot-water usage, installation budget, existing infrastructure, and long-term expectations before choosing a system.
Also Read: Tankless Water Heater Maintenance in DuPage County, IL: A Homeowner's Guide
Should You Replace Your Water Heater With Tankless or Keep a Traditional Tank?
The right choice depends on your home's needs.
A traditional tank water heater may remain a practical option if your current system works reliably, meets your household's hot-water demand, and does not need major repairs.
A tankless system may be worth considering if you want an on-demand heating system, prefer a compact design, and are comfortable with the conversion requirements.
Before deciding, compare the equipment cost, installation modifications, expected maintenance, and available hot-water capacity.
You can also read our guide: Tank vs. Tankless Water Heater: Which Is Better for Your Home?.
Why Professional Tankless Water Heater Installation Matters
Converting from a traditional water heater to a tankless system involves gas, electrical, plumbing, and venting considerations.
Incorrect equipment sizing, inadequate gas supply, or incompatible venting can affect performance and create safety risks.
A qualified plumbing professional can evaluate your existing setup, recommend suitable equipment, identify necessary modifications, and complete the installation according to manufacturer instructions and applicable local codes.
Professional planning also helps homeowners understand the expected installation work before committing to a conversion.
Tankless Water Heater Conversion in DuPage County, IL
Planning to replace your traditional water heater with a tankless system?
Dream Home Plumbing Co. provides tankless water heater repair and installation services for homeowners in Glen Ellyn and throughout DuPage County, IL.
Our family-owned team can help evaluate your existing water heater, discuss installation requirements, and identify a suitable solution for your home.
Whether you are considering a new tankless system or need help with an existing unit, explore our Tankless Water Heater Repair & Installation Services.
We serve homeowners in communities including:
- Glen Ellyn
- Naperville
- Wheaton
- Lombard
- Downers Grove
- Lisle
- Elmhurst
- Carol Stream
Dream Home Plumbing Co. provides reliable Residential Plumbing Services in Glen Ellyn and throughout DuPage County, IL. From professional water heater installation and tankless system upgrades to everyday plumbing repairs, our family-owned team delivers quality workmanship and dependable solutions to keep your home's plumbing running smoothly.
Final Thoughts
Replacing a traditional water heater with a tankless system can be a worthwhile upgrade, but the right solution depends on your home's plumbing, gas supply, electrical capacity, and hot-water requirements.
Before making the switch, have your existing system evaluated so you understand the installation requirements and expected costs.
Need Help Planning a Tankless Water Heater Conversion?
Explore professional Tankless Water Heater Repair & Installation from Dream Home Plumbing Co. for your home in DuPage County, IL.