Tankless water heater cost of installation

Looking for tankless water heater cost of installation in St. Louis, MO? Call WaterHeater Experts for a contact a provider — no obligation. Licensed plumbers serve St. Louis and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

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What affects the price

When you are looking at the price of a new water heater, a few main things shift the final number. The type of unit you choose—whether it is a tank model or a tankless system—is the biggest factor. You also have to consider the fuel source, like gas or electric, and the physical space where the heater sits. If your home needs new venting, updated piping, or a different hookup to meet current safety codes, that adds labor time to the project.

About this service

When you switch to a tankless system, the installation price covers the labor required to modify your gas lines, upgrade venting, and configure the plumbing. Costs typically vary based on the complexity of your current setup and the capacity of the unit you choose. A professional technician will need to assess your home's layout to provide an accurate estimate for these modifications. Exact pricing confirmed free on the call.

Even though it is warm outside, your water heater is still working daily. Summer is a great time to adjust your settings, as the incoming water isn't as cold, which can actually help extend the life of your unit. If you are planning a home renovation or just want to upgrade to a more efficient model, call us to talk through your options.

Frequently asked in St. Louis

How long do hot water heaters typically last in St. Louis?

In St. Louis, traditional tank water heaters typically last between 8 to 12 years. The quality of water in the area and regular maintenance can influence this lifespan. Tankless water heaters generally offer a longer service life, often 20 years or more when properly maintained.

What is the average cost of putting in a water heater in St. Louis?

The average cost of putting in a water heater in St. Louis varies based on the type of system (tank or tankless) and any unique plumbing requirements in your home. The complexity of the installation process will also affect the final price. We can provide a detailed quote over the phone.

What is the most efficient type of water heater for St. Louis?

For St. Louis homes, tankless water heaters are a highly efficient choice as they heat water on demand, reducing wasted energy. Heat pump water heaters also offer significant energy savings. The best option depends on your household's hot water consumption and budget considerations.

What are signs I need a new water heater in St. Louis?

Signs you might need a new water heater in St. Louis include a decrease in hot water availability, water that is discolored or has a strange odor, unusual noises emanating from the unit, or visible leaks. The age of the heater is also a key factor.

What is the most common problem with a hot water heater?

The most common problems experienced with hot water heaters include a lack of hot water, insufficient hot water volume, or water that isn't heating properly. Other frequent issues involve leaks, sediment buildup, and pilot light malfunctions. A professional can diagnose and resolve these issues.

Is it worth it to repair a water heater in St. Louis?

Deciding whether to repair or replace a water heater in St. Louis often depends on the unit's age and the nature of the problem. Minor repairs on a newer heater are usually cost-effective. However, for older units or extensive issues, replacement often proves more economical in the long run.

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More on this: DOE water heating — efficiency and sizing.