How Long Does it Take to Install a Commercial Water Heater?


Hot water is essential to any restaurant, hotel, or craft brewery’s operations. Selecting an appropriately sized commercial water heater installation can prevent costly mistakes from being made, such as choosing too small of size or oversizing too large of an option.

Want to hire a professional for commercial water heater services in Chicagolands? Consider J. Blanton Plumbing.

What does a commercial water heater do?

A commercial water heater is a larger and more powerful unit than the residential variety. It produces hot water at a high flow rate to meet the needs of businesses that require large volumes of hot water for their operations.

Commercial heaters are designed to handle many gallons of hot water per day, while residential models typically provide much less.

Tank to tank installation

A licensed plumber should only require 2 to 3 hours to replace an identical tank water heater with one of a similar type. This process includes shutting off the water supply, draining the old unit, connecting new water and gas supply lines, and testing before completion.

However, depending on other factors like existing plumbing projects or the way your business layout is designed, it may take longer.

Tank to tankless installation

A licensed plumber typically can have your tankless water heater up and running in 4 to 6 hours, though this depends on the unit type and your business.

Once your old unit has been disconnected, drained, and taken away, your plumber will install your tankless gas water heater according to the manufacturer’s instructions, mounting it to a wall while leaving enough clearance.

They’ll need additional time to install air vents, as well as new water and power lines.

Your plumbing professional may also need to add sediment traps, shut-off valves, and pressure reduction valves.

Tankless to tankless installation

Replacing a tankless heater and switching out a tankless model for another is perhaps the quickest and simplest, requiring a minimum of 1 hour. Depending on your existing system though, it may extend to 3 hours.


Installing a commercial water heater is generally not something that you can do yourself, as it requires specialized knowledge and tools. Hiring a professional who understands what they’re doing will ensure your installation goes smoothly and quickly.

When choosing the right plumber, make sure you select one with both experience and expertise in the particular type of water heater system you have or are planning to install.

The type of water heater you choose and the complexity of the installation will depend on your specific needs. However, when properly installed by a qualified professional, it should provide reliable hot water for years to come.

And since an efficient system can save energy costs, the savings from installing a quality system may offset any associated installation costs. Investing in quality services and parts can go a long way in extending the life of any commercial water heater.