Tankless water heater and installation cost

Looking for tankless water heater and installation cost in St. Louis, MO? Call WaterHeater Solutions 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

Replacing your water heater involves several variables that change the final bill. The biggest factor is the unit type—tankless models usually cost more upfront than traditional tank-style heaters due to installation complexity. You also have to consider the fuel source, as switching from gas to electric often requires electrical panel upgrades. Size matters too; a larger home needs a unit with higher recovery rates. Finally, local building codes might require additional safety equipment, like expansion tanks or updated venting.

About this service

Putting together the price for a tankless unit and the labor to install it involves evaluating your home's unique layout. You would consider this service when you are ready to move away from traditional storage tanks and want more energy efficiency. Exact pricing confirmed free on the call.

Frequently asked in St. Louis

How long do hot water heaters typically last?

In St. Louis, most tank water heaters typically last between 10 to 15 years. Tankless water heaters, with proper maintenance, can often provide hot water for 20 years or more. The mineral content in local water can sometimes affect the lifespan of any water heater.

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

What is the most efficient type of water heater?

For many St. Louis homeowners, tankless water heaters offer the highest efficiency. They heat water on demand, meaning you only use energy when hot water is needed, which can lead to lower utility bills. Heat pump water heaters are also a very energy-efficient alternative.

What are signs I need a new water heater?

You should consider a new water heater in St. Louis if you notice a significant decrease in hot water, unusual noises like rumbling or popping, or visible leaks around the unit. Rusty water is also a strong indicator of a problem, as is an aging unit approaching its typical lifespan.

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

Sediment buildup is a common culprit for water heater issues in St. Louis, leading to reduced efficiency and noise. Other frequent problems include thermostat malfunctions or issues with the heating elements. Any leaks, no matter how small, should be inspected by a professional.

Is it worth it to repair a water heater?

Repairing a water heater in St. Louis can be a cost-effective solution for minor issues on newer units. However, if your water heater is old, shows signs of significant corrosion, or requires frequent, expensive repairs, investing in a new, more efficient model is often the better long-term financial decision.

Also serving nearby: O Fallon · Springfield · Columbia · Champaign · Peoria

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