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Index for Tankless Water Heaters by Rheem

electric tankless water heaters - all kinds of tankless water heaters - index

Rheem Tankless Water Heaters
Click on a model below for more information
Tankless water heater series RTG-53
Model RTG-53
RTG-74 Series tankless water heaters by Rheem
Model RTG-74
Image for GT-199 tankless water heater by Rheem
Model GT-199

Specifications / Comparison Chart
DESCRIPTION FEATURES ROUGHING IN DIMENSIONS (shown in inches)
Model # Gas
Input
BTU/Hr.
Type Temp.
Range*
GPM @ 77°
Rise Max.
GPM @ 45°
Rise Max.
Water
Conn.
Gas
Conn.
Height Width Depth Vent
Diameter
RTG-53PVN
(Nat. Gas)
21,500-145,000 Indoor 100° to
140°F
3.1 5.3 3/4" 3/4" 20-1/2" 13-3/4" 6-1/4" 3"
RTG-53PVP
(LP Gas)
21,500-145,000 Indoor 100° to
140°F
3.1 5.3 3/4" 3/4" 20-1/2" 13-3/4" 6-1/4" 3"
RTG-53XN
(Nat. Gas)
21,500-145,000 Outdoor 100° to
140°F
3.1 5.3 3/4" 3/4" 20-1/2" 13-3/4" 6-1/4" N/A
RTG-53XP
(LP Gas)
21,500-145,000 Outdoor 100° to
140°F
3.1 5.3 3/4" 3/4" 20-1/2" 13-3/4" 6-1/4" N/A
RTG-74PVN-2
(Nat. Gas)
19,000-199,900 Indoor 100° to
140°F
4.2 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" 4"
RTG-74PVP-2
(LP Gas)
19,000-199,900 Indoor 100° to
140°F
4.2 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" 4"
RTG-74XN-2
(Nat. Gas)
19,000-199,900 Outdoor 100° to
140°F
4.2 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" N/A
RTG-74XP-2
(LP Gas)
19,000-199,900 Outdoor 100° to
140°F
4.2 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" N/A
GT-199PVN-2
(Nat. Gas)
19,000-199,900 Indoor 100° to
180°F
4.3 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" 4"
GT-199PVP-2
(LP Gas)
19,000-199,900 Indoor 100° to
180°F
4.3 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" 4"
GT-199XN-2
(Nat. Gas)
19,000-199,900 Outdoor 100° to
180°F
4.3 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" N/A
GT-199XP-2
(LP Gas)
19,000-199,900 Outdoor 100° to
180°F
4.3 7.4 3/4" 3/4" 25-3/8" 14-7/8" 11-1/8" N/A


Tankless Water Heaters - How It Works

Frequently asked questions about Rheem Tankless Water Heaters

questions about Rheem Tankless Water Heaters "How much hot water must be flowing before the tankless water heater turns on?"
answers about Rheem Tankless Water HeatersThe minimum flow to operate these tankless water heaters is 0.66gpm.

questions about Rheem Tankless Water Heaters "What is the minimum amount of water pressure needed for these to operate?"
answers about Rheem Tankless Water HeatersThese units require a consistent 14psi or better water pressure to operate.

questions about Rheem Tankless Water Heaters"Will an instantaneous water heater save me money on my utility bills?"
answers about Rheem Tankless Water Heaters Yes, in most applications you will see a savings. There are some variables that could reduce the amount you save. One example is you will not run out of hot water, so longer showers could cut into your savings. Also, the cost of electricity, propane and natural gas in your area will affect the amount of money saved. The higher the cost for the energy type used to heat your water, the quicker you will recover the higher initial cost of installing a tankless versus tank style water heater.

Positives:

    You will never run out of hot water. "You want an hour long shower? No problem!"
    Electric units can be installed at the point of use.
    You're not paying energy costs to heat water 24 hours a day.
    They're easy to install.
    Our electric units don't require a T&P valve. (No tank!)
    Installing a tankless water heater will indeed be a bonus to the environment (why should we choose wastefulness when we're talking about finite natural resources)?

Negatives:

    They all need a minimum flow rate & pressure to turn on.
    The faster water flows through them, the lower the temperature rise. So, if you expect to take a shower while the clothes washer is running, you will need to select a unit sized to your hot water flow requirements. (Gas units handle this a little better than electric models)
    Electric units need heavy gauge wire. Example: the 9.5kw must have 8ga wire and a 50amp breaker.
    Gas units need a much larger, special flue pipe and larger gas supply than a conventional water heater.
    At times they can produce very hot water. It's easier to get scalded.
    Gas units are more complicated than a conventional water heater.
    With some brands, parts are hard to find (not a negative if you originally purchase from us, as we like to carry parts for the units that we sell).

Summary:
Tankless water heaters have their place. They're not "the answer" to every hot water need, but if they're used correctly they can be the solution to many of them.

questions about Rheem Tankless Water Heaters "What water pressure is needed for supplying hot water to upper floors?"
answers about Rheem Tankless Water HeatersTo supply water to upper floors, you'll need an additional 0.44psi/ft of water pressure. Basically, for every one vertical foot, you'll need an additional 0.44psi of water pressure.

questions about Rheem Tankless Water Heaters "What water pressure is recommended for well water?"
answers about Rheem Tankless Water Heaters Most well water systems are set at a range of 30-50psi or 40-60psi. DO NOT change your settings without consulting with a professional.

questions about Rheem Tankless Water Heaters "What are the best reasons to install a Scale Inhibitor System?"
answers about Rheem Tankless Water HeatersThe system inhibits scale build-up and protects the piping from corrosion, which helps maintain efficiency and extends the life of the system.


We offer many thoughts (quotes) to ponder, such as:
"As a rule, there is no surer way to the dislike of men than to behave well where they have behaved badly." - Lew Wallace

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