Rheem Energy Star Qualified Tankless Water Heaters

Energy Star Qualified
All Rheem Tankless Water Heaters are Energy Star qualified. Products with the Energy Star label are the most energy efficient choices you can make as a consumer. Click here for more information on the Energy Star program.

2009 Consumer Tax Credit
Rheem Tankless Water Heaters purchased between January 1, 2009 and December 31, 2009 are eligible for a federal Tax Credit of $300. Please note that the IRS will provide the final rules and forms needed to clarify how to apply for your tax credit (please follow the links on the right side of the screen to download these forms). Consult your tax advisor, or visit the Tax Incentives Assistance Project website for more information.

Shipping Tankless Gas Water Heaters

Notice: Tankless Gas Water Heaters will ship the "Best Way" at our option, that may be LTL.

Not all shipping options are available for Tankless Gas Water Heaters as our on-line shipping calculator will imply. 

The Rheem Tankless Indoor Model RTG-74PV

The Rheem Tankless Indoor Model RTG-74PV
10-Year Limited Warranty on Heat Exchanger*
3-Year Limited Warranty on Parts*
*See Residential Warranty Information Brochure for complete warranty information.

Available in Natural Gas or Propane models.

Rheem Tankless 7.4 GPM Gas Water Heater for Indoor Installation. Model RTG-74PV - by Rheem / Ruud

• Continuous hot water - 7.4 gallons per minute at a 45° rise
• Energy saving design
• Compact, space saving design
• Intelligent electronic controls and sensors
• Self diagnostic program
• Digital display shows temperature setting and maintenance codes
• Exclusive sensing burner technology
• Exclusive film wrap overheat limiter
• Built-in electric blower
• Indoor units use 3" Category III stainless steel vents and vent horizontally or vertically
• Supplied with a 120 Volt power cord
• Supplied remote control (USC1-117) allows temperature settings up to 120° F
• Optional remote control (UMC-117) - not included - allows temperature settings up to 140° F
• Indoor and outdoor models feature freeze protection to -30° F
• Low NOx emissions meet SCAQMD rule 1146 requirements

We Also Offer

• RTG-42PV Rheem Tankless 4.2 GPM PowerVent for Indoor Installation (Cat III Stainless Steel Venting Required)
• RTG-53PV Rheem Tankless 5.3 GPM PowerVent for Indoor Installation
• RTG-53DV Rheem Tankless 5.3 GPM Direct Vent for Indoor Installation
• RTG-53X Rheem Tankless 5.3 GPM for Outdoor Installation
• RTG-74 PV Rheem Tankless 7.4 GPM PowerVent for Indoor Installation (Cat III Stainless Steel Venting Required)
• RTG-74DV Rheem Tankless 7.4 GPM Direct Vent for Indoor Installation
• RTG-74X Rheem Tankless 7.4 GPM for Outdoor Installation
• GT-199PV Rheem Tankless Heavy Duty PowerVent for Indoor Installation (Cat III Stainless Steel Venting Required)
• GT-199DV Rheem Tankless Heavy Duty Direct Vent for Indoor Installation
• GT-199X Rheem Tankless Heavy Duty Outdoor Model

Continuous Hot Water... When you need it.

Continuous Hot Water... When you need it. It's That Simple.

The popularity of oversize tubs is growing, and so is the demand for large volumes of low-cost hot water. The Rheem Tankless provides a compact solution for a continuous supply of energy efficient hot water that won't run out.

Energy Efficient Design... Low-Cost Operation

Why keep 40-50 gallons of water hot when you don't need it? It's expensive to continue to heat and re-heat water when you're not home or not using it. Rheem's tankless design offers convenience without the high cost of keeping water hot.

Compact Size... Good Things Do Come In Small Packages.

Rheem Tankless is about the size of a medicine cabinet. Sophisticated technology has reduced the size and increased the features and benefits. A digital display makes setting a precise water temperature, or monitoring the unit's status, a snap! Its compact size will leave room for a water softener or extra storage.

Precise Temperature Control

Many user and installer-friendly features make the Rheem Tankless the easiest tankless water to use. The digital display makes it simple to set the water temperature. Simply set the desired temperature and walk away. Becuase the water is heated only when it is needed, the outgoing water temperature remains constant.

Self-Diagnostic

Should maintenance be required, the unit's self-diagnostic system will display a maintenance code, which makes troubleshooting quick, accurate and less expensive.

Rheem Quality

We are committed to providing the highest quality product to customers. The Rheem Tankless is no exception. The specially designed features have been field and laboratory tested to ensure consistent, precise operation to meet our quality standards.

These units are designed to meet or exceed ANSI (American National Standards Institute) requirements and have been tested according to D.O.E. test procedures and meet or exceed the energy efficiency requirements of NAECA, ASHRAE standard 90, BOCA Code and all state energy efficiency performance criteria for energy consuming appliances. Before purchasing this appliance, read important energy cost and efficiency information available from your supplier.

Maximum Hot Water Flow Rate and Temperature Rise
• 45°F Rise - 7.4 GPM
• 50°F Rise - 6.7 GPM
• 60°F Rise - 5.6 GPM
• 70°F Rise - 4.8 GPM
• 80°F Rise - 4.2 GPM
• 90°F Rise - 3.7 GPM
• 100°F Rise - 3.3 GPM
Minimum flow rate required to initiate heating cycle .66 GPM. Above estimates are for sizing purposes only.

These units are designed to meet or exceed ANSI (American National Standards Institute) requirements and have been tested according to D.O.E. test procedures and meet or exceed the energy efficiency requirements of NAECA, ASHRAE standard 90, BOCA Code and all state energy efficiency performance criteria for energy consuming appliances. Before purchasing this appliance, read important energy cost and efficiency information available from your supplier.

A USC1-117 waterproof remote control is included. Requires 18 AWG, 2 conductor thermostat wire for remote control connection. Wire not included.

Venting and High Altitude Options

Rheem Tankless Water Heater Options

A Vent Adapter is Required for the Rheem RTG-74 ( RTG20002B).

Rheem also offers a Vent Kit for the RTG-74, which includes the required vent adapter (RTG20002B)

We also have a full line of CAT III Stainless Steel Venting Kits available for this product!

For Higher Altitudes

We carry Rheem's High Altitude Chip, necessary in higher altitudes to properly configure your Tankless Water Heater.

Frequently Asked Questions about Tankless Gas Water Heaters

Q: What is a tankless water heater?
A: Tankless water heaters are compact in size and provide a steady flow of hot water for as long as you need it. Rheem tankless gas water heaters are more energy efficient than conventional water heaters, because the tankless models eliminate the need for re-heating stored water.

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

Q: Can it be installed in the same place my old hot water heater was installed?
A: As long as enough combustion air is provided, Rheem tankless water heaters can be installed in a utility room, garage, basement, attic, or placed on an outside wall. Plus, they can be installed in locations where a storage water heater may not fit. The Digital Temperature Controller can be mounted in any room.

Q: Are tankless water heaters energy efficient?
A: Yes, tankless water heaters are very energy efficient. The Energy Factor, EF, of all Rheem tankless water heaters is over .81. By comparison, a standard tank type water heater has an EF of around .62, so you can see that they are inherently more efficient than a storage type water heater.

Q: Is a tankless water heater more energy efficient than a tank?
A: Rheem tankless gas water heaters are more energy efficient than conventional water heaters, because they eliminate the need to maintain a large supply of heated water. A Rheem tankless water heater operates only when hot water is needed. Regardless of whether you currently have a conventional electric or gas water heater, the Rheem tankless will save money on your energy bills. In addition, every Rheem tankless water heater qualifies for up to a $300 tax credit.

Q: What is the Energy Factor for the RTG-42 series water heaters?
A: Answer: 0.83

Q: What is the Energy Factor for the RTG-53, RTG-74 and 199 series water heaters?
A: Answer: 0.82

Q: Does this mean tankless water heaters have lower operating costs?
A: A higher EF is only one of many reasons why tankless water heaters cost less to operate. A Rheem tankless water heater has no standing pilot light, no stand by loss, and the burners modulate to maintain maximum efficiency.

Q: How do I ensure that I select a tankless water heater in the appropriate size for my home?
A: It's as easy as 1-2-3! If your home has only one bathroom, a Rheem tankless RTG42 series water heater provides an ample supply of continuous hot water for your needs. If your home has two bathrooms, a Rheem RTG-53 series water heater provides an ample supply of continuous hot water for your needs. If your home has three bathrooms, choose a Rheem RTG74 series, which can supply up to 3 showers simultaneously. Homeowners with 3 or more bathrooms and/or large volume multi-head showers should consider linking manifolding 2, 3, or more of our tankless water heaters together.

Q: Does Rheem offer customer service for their tankless water heaters?
A: Yes! Rheem Customer Service is available 7 days a week/7 a.m. to 7 p.m. Central Time. The professional staff provides fast, reliable service. Customer service options are available, please call 1-866-720-2076 or visit www.rheemtankless.com.

Q: What is the minimum water flow rate required for the tankless water heater to ignite?
A: All Rheem tankless water heaters require a minimum flow rate of .66 GPM to ignite the burner. Too little flow will not activate the main burner.

Q: What type of exhaust venting do these products require?
A: The venting must be Category III, Stainless steel, and it applies to the adapter, the vent pipe, all elbows, and terminal vent. This is important because the flue gases and by-products of combustion can cause condensation. Stainless steel will not deteriorate like type B venting under these conditions. The RTG-53X, RTG-74X and GT-199X outdoor models do not require any venting materials. Always consult the Use and Care Manual provided with the water heater for detailed installation and venting instructions.

Q: Can you adjust the water heater setpoint temperature setting in 1 degree increments?
A: No, the minimum temperature adjustment for RTG series waters heaters is a 2 degree increments from 100 F up to 120 F and 5 F increments from 120 F to 140 F.

Q: What are the temperature setting options for each model?
A: The minimum temperature adjustment for GT series water heaters is a 2 degree increments from 100 F up to 120 F and 5 F increments from 120 F up to 180 F.

Q: What safety device is used to prevent overheat failure of the heat exchanger?
A: An Over Heat Limiting Film wrap is wrapped around the entire heat exchanger. This monitors the temperature of the heat exchanger and will shut the unit down if it exceeds a safe temperature. This is an exclusive feature of the Rheem tankless water heaters.

Q: What is the minimum clearance on the back, sides, top, bottom, and front of the water heaters?
A: 0" back, 1/2" sides, 12" top, 12" bottom, and 12" front.

Q: What does the sensing burner do?
A: The sensing burner is a device that detects incomplete combustion during operation of the water heater. If incomplete combustion is detected, the water heater corrects the problem to provide clean, efficient water heater operation at all times. This is an exclusive feature of the Rheem tankless water heaters.

Q: Is there a standing pilot?
A: No, the direct ignition sends a spark to the main burner when hot water flow is detected. This feature improves the energy efficiency of the water heater.

Q: Can the water heater be installed at elevations that are 5,000 or 6,000 feet above sea level?
A: All Rheem tankless water heaters can be programmed to operate at elevations up to 9,840 feet. Optional programming chips are available for elevations greater than 3,280 feet above sea level. One programming chip is available for elevations between 3,280 - 6,560 feet, and a second optional chip is available for elevations between 6,560 - 9840 feet. The chips install on the water heater circuit board PCB in a matter of minutes and are available from the Rheem Service Parts Department. This again is an exclusive Rheem feature and is designed to insure proper combustion at these higher altitudes.

Q: Can I convert the water heater from LP to natural gas or natural gas to LP?
A: No, these units can not be converted from one fuel source to another.

Q: Where in my home can I install a Rheem tankless water heater?
A: The RTG-42PV, RTG-74PV, and GT-199PV indoor units are very versatile, and can be installed in a utility room, a garage, a basement, or an attic as long as enough combustion air is provided. As with any appliance, consult local codes and the manufacturer Use and Care manual prior to choosing the site for installation. They may not be installed in a bedroom or bathroom, and are not designed for use in mobile homes. The RTG-53DV, RTG-74DV, and GT-199DV may be installed in all locations, including bedrooms and bathrooms. These units obtain combustion air from the outdoors. These models are not designed for use in mobile homes. The RTG-74X and GT-199X outdoor models are for outdoor installations only, and are a great alternative if your climate is appropriate. This saves space and the cost of venting.

Q: What are some reasons to use a tankless water heater over a standard storage-type water heater?
A: Tankless water heaters can provide a continuous supply of hot water, while a tank will run out of hot water. Tankless 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.

Q: How much can I expect to save on my monthly bill if I install a tankless water heater?
A: Test results have shown that a tankless gas water heater costs about 40% less to operate than an electric water heater, and about 30% less than a natural gas water heater.

Q: How much more do they cost to purchase?
A: Generally, a tankless water heater will cost about 2 to 2-1/2 times as much as a standard water heater to purchase and install. Keep in mind that in addition to lower operating costs, useable square footage is gained by choosing tankless!

Builders... Why Choose Rheem Tankless?

Builders... why choose Rheem Tankless?

Typical Tank type water heaters take up approximately 9 square feet.
A typical tankless water heater measures only 25 3/8" inches high by 14 7/8" inches wide and can be mounted on an interior or exterior wall.

Typical 50 gallon gas water heaters weigh 165 pounds.
A RTG-74PV water heater weighs 55 pounds. Saves labour!

Typical 50 gallon gas water heaters have an energy factor of .62.
A Rheem RTG-74PV tankless water heater has an energy factor of .82.

Rheem RTG-74PV will consume approximately 20 to 25% less in fuel costs than a typical 50 gallon gas fired tank type water heater.
This comparison is based on both heaters using the same amount of hot water per week.

Tank type water heaters fire at full BTUs whenever the thermostat calls for heat.
A Rheem Tankless water heater has a modulating gas valve and only fires at the BTUs necessary to meet the job.

Tankless Water Heaters only heat the amount of water necessary to meet the demand.
A tank type water heater heats the entire contents of the storage tank to meet large or small demands.

Tankless Water heaters, when sized properly, will provide an endless supply of hot water.
A 50 gallon tank type water heater would run out of hot water after the third consecutive 10 minute shower based on a 2.5 GPM shower head.

Rheem tankless water heaters provide + or - 2 degrees F incremental temperature control with the remote controlled thermostat, which can be mounted anywhere in a home.

Only Rheem tankless indoor products offer our patented sensing burner technology. Our sensing burner technology monitors the precise mixture of air and gas to prevent incomplete combustion and the products of carbon monoxide.

Rheem Tankless water heaters have been recognized and rated for energy efficiency by the Gas Appliance Manufacturers Association (GAMA), the most well-respected gas industry association.

The national average life expectancy for tank type water heaters is 12 years.
The national average life expectancy for tankless water heaters is 20 years.

Rheem Tankless water heaters have been refined and perfected since 1945.

Builder Uses Rheem Tankless Water Heaters To Heat Up Home Sales in Union County, N.C.

CHARLOTTE, N.C., August 1 / At a time when new home sales are slowing, Union County, N.C. is one of the fastest-growing areas around Charlotte. Benefiting from that expansion is Bonterra Builders, which projects doubling sales to 300 homes this year.

One reason for this growth is the environmentally friendly "green" elements of the plan for Bonterra's Quintessa Estate Homes, a gated community with houses on one- to two-acre sites. At the top of the green list are tankless Rheem water heaters, which are standard in every Quintessa home.

"Quintessa homeowners are educated and very concerned about the environment, as well as the products and services they elect to use," says Dennis Wood, vice president of Bonterra's Custom Homes Division.

Rheem tankless technology provides a wide range of features appealing to homebuyers, starting with high energy efficiency. Add space saving and continuous hot water, and the tankless water heaters are the ideal for any home. Bonterra Builders chose Rheem with these features in mind, as well as their convenience and low operating costs.

The tankless water heaters utilize advanced electronic technology for energy efficiency. They supply a continuous flow of low-cost hot water when and where it is needed.

Because tankless water heaters heat water strictly on demand, no energy is wasted constantly heating and re-heating water in a 40- or 50-gallon storage tank. A precise digital controller makes it simple for homeowners to adjust the maximum water temperature up or down.

Going green is definitely catching on. According to the Urban Land Institute, there is a growing demand for environmentally conscious development, and consumers are driving it. Nine out of ten builders surveyed in 2005, say they are incorporating energy-saving products into new homes. Water heaters are among the most commonly upgraded items for energy savings, according to the survey.

As Crystal Wood, Quintessa Estate Homes sales manager, prepares to close a deal, she makes sure to guide the prospective buyers into the master bath.

"In this price range, the master baths are very luxurious, complete with rain-can shower heads, body jets and steam rooms," she says. "The Rheem tankless system provides a double benefit -- water for the parents to turn an everyday shower into a luxury experience and for the kids to have their daily showers. Our families have a lot of kids, and the parents love the idea of unlimited hot water, so they won't be stuck with a cold shower!"

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