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Rheem FAQ

Rheem FAQ

Water Heating FAQs

How can I determine which water heater is right for me?

Choosing a water heater is based on your family size and how much hot water you will use in one continuous hour. We call it Peak Hour Demand.

What is the longest warranty Rheem offers?

The Rheem Marathon® water heater offers a LIFETIME warranty. The Marathon is a special water heater that has a seamless blow molded polybutene inner tank. It will not rust. The several inches of foam insulation give it up to 0.93 uniform energy factor. Tank sizes range from 15 gallons to 105 gallons to fit any household need. Once you purchase this water heater, the lifetime warranty is extended to the original owner when installed in a residential application.

Do you make water heaters designed for commercial applications?

Yes, we do. We have a full line of standing pilot, intermittent spark, direct vent, sealed combustion and high efficiency commercial water heaters. Our Xtreme models will provide up to 756 gallons of hot water in an hour; and recover the tank contents in as little as 8 minutes! You can select from an electric model or gas model.

Tank vs Instant Water Heaters

Rheem Instant Features

Rheem Tank Features

Instant FAQs

What is a instant water heater?

Instant water heaters are compact in size and provide a steady flow of hot water for as long as you need it. Rheem instant gas water heaters are more energy efficient than conventional water heaters, because the instant models eliminate the need for reheating stored water.

How does the Rheem instant water heater work?

A conventional tank-style water heater stores hot water, and heats the water 24/7, whether you use it or not. The new generation Instant Technology Water Heater from Rheem only heats water on demand. When the faucet is opened, the water flows through the Rheem Instant Water Heater, which heats it to the temperature you’ve set. When the faucet is closed, the Rheem Instant Water Heater senses the command, and goes to standby mode.

Can it be installed in the same place my old water heater was installed?

Yes, Rheem instant water heaters can be installed in an existing bathroom.

Where in my home can I install a Rheem instant water heater?

Rheem instant water heaters may be installed in bathroom locations.

What are some reasons to use a instant water heater over a standard storage-type water heater?

Instant water heaters can provide a continuous supply of hot water, while a tank will run out of hot water. Instant products also have a longer life; lower operating costs, precise delivery temperature, and can be installed in many locations where a storage water heater may not fit.

Buying Online FAQs

How do I contact a Contractor to make an equipment purchase?

Please use the Dealer Contact Sheet to locate a professional Contractor near you. Please note that the Contractors listed on the Find a Pro system are independent contractors and are not owned by, employed by, operated by or authorized by the Rheem Sales Company.


How do I register Water Heating equipment that I install?

Visit the warranty registration page for warranty verification and product registration.


Where can I purchase the full line of Rheem products?

Builders currently purchase equipment through our Rheem or Ruud pros who are purchasing through our distributors.

Architects / Engineers

How do I get a copy of your product catalog?

Please visit the contact form and enter your information. Be sure to request a catalog in the comments field.

How do I size Rheem products?

We have a qualified staff who will be able to assist you. Please visit our contact form or call your local Rheem Partner.


How can I become a Rheem Distributor?

To become a distributor please visit our contact form and indicate your interest in becoming a distributor in the comments field.  A Rheem representative will then contact you.

How do I register my equipment?

Please visit the Warranty Registration page.

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