Tankless water heater cost with installation

Looking for tankless water heater cost with installation in St. Louis, MO? Call WaterHeater Services 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 shopping for a new water heater, the final cost depends on a few moving parts. First, consider the fuel source—switching from electric to gas or vice versa involves more labor. The capacity you need, measured in gallons, also changes the price tag, as does the physical footprint of the unit in your home. If your current plumbing or venting needs updates to meet modern safety codes, that adds to the work involved. We help you sort through these variables, with exact pricing confirmed free on the call.

Frequently asked in St. Louis

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

In St. Louis, standard tank water heaters usually last between 8 to 12 years. The humidity and water quality can impact their lifespan. Tankless models often offer longer durability. It's advisable to have a professional inspect older units for potential problems.

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

What is the most efficient type of water heater?

Tankless water heaters are typically the most energy-efficient, as they heat water only when you need it. This avoids the energy waste associated with keeping a large tank of water hot constantly, which is beneficial for managing utility bills in St. Louis. They offer on-demand hot water. A specialist can determine if it's the right choice for your home.

What are signs I need a new water heater?

Watch for discolored or rusty water, unusual noises like popping or rumbling, or a noticeable decrease in hot water volume. Leaks around the base of the unit are also a strong indicator. If your water heater is over a decade old and showing these symptoms, replacement is likely necessary. A pro can provide a thorough assessment.

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

Sediment buildup is a frequent issue that can reduce efficiency and create noise. Other common problems include thermostat failures and issues with the heating elements. Regular maintenance can help prevent many of these, but sometimes replacement is the most practical solution.

Is it worth it to repair a hot water heater?

Repairing a younger water heater with a minor issue, such as a faulty thermostat, can be a cost-effective approach. However, if your unit is aging, shows signs of corrosion, or has experienced a significant leak, replacing it might be more economical over time. Seek professional advice specific to your situation.

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