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Rheem Tankless Water Heater RTG-74 Series

Rheem tankless water heater index - Rheem tankless water heater GT-199
RTG-53 tankless water heater by Rheem - Chronomite instant water heaters - Takagi TK1S water heaters


Pronto Tankless Gas Water Heaters
tankless water heaters
Shown: RTG-74 indoor & outdoor models
These tankless water heaters feature:
  • Continuous hot water
  • Energy efficient design, no storage tank to keep hot
  • Electronically controlled - 120V, 60Hz single phase
  • Low NOx emissions
  • Self-diagnostic program
  • Digital display remote
  • Exclusive oxygen depletion sensor - checks the exhaust gas to see how clean the unit is burning so the unit can adjust the sensing burner for a cleaner burn.
  • Exclusive film wrap overheat limiter - monitors the temperature of the heat exchanger and will shut the unit down if it exceeds a safe temperature. It also checks for a lack of oxygen - if detected, the unit will shut down.
  • Built-in electric blower
  • Includes 3/4" gas ball valve
  • Indoor units use Category III stainless steel vent
  • Indoor models supplied with a 120 volt power cord
  • Low NOx emissions meet SCAQMD rule 1146 requirements
  • UMC-117 remote control is included - factory set to 120°F (can be dipswitch changed to a max 140°F) - additional remote control thermostats can be purchased separately
  • Manufacturer's 10 year limited warranty on heat exchanger, 3 year limited warranty on parts
  • Click for specifications
  • Note: these units are designed for installations from 0 to 3280 feet above sea level

Natural Gas Tankless Water Heaters - INDOOR Installation
Model # INDOOR MODEL - Description Price & Quantity
RTG-74PVN-2 Indoor Natural Gas Tankless Water Heater - 19,000 - 199,900 btu/hr $848.78
Accessories for RTG-74PVN-2
RTG-20007 Installation Vent Kit for Horizontal Termination for RTG-74PV indoor tankless water heaters - 4" diameter. Included Components: Adapter (1), 90 Degree Elbow (2), 12" Length Vent Pipe (1), 6-19" Adjustable Length Slip Connector - 2 Pieces (1), Horizontal Wall Thimble (1), 90 Degree Elbow Termination with Vent Screen (1), Thermostat Wire for Remote Connection (1), Pressure Relief Valve (1). $289.21

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Natural Gas Tankless Water Heaters - OUTDOOR Installation
Model # OUTDOOR Model - Description Price & Quantity
RTG-74XN-2 Outdoor Natural Gas Tankless Water Heater - 19,000 - 199,900 btu/hr $848.79

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Propane Tankless Water Heaters - INDOOR Installation
Model # Description Price & Quantity
RTG-74PVP-2 Indoor Propane Tankless Water Heater - 19,000 - 199,900 btu/hr $849.98
Accessories For RTG-74PVP-2
Model # Description Price & Quantity
RTG-20007 Installation Vent Kit for Horizontal Termination for RTG-74PV indoor tankless water heaters - 4" diameter. Included Components: Adapter (1), 90 Degree Elbow (2), 12" Length Vent Pipe (1), 6-19" Adjustable Length Slip Connector - 2 Pieces (1), Horizontal Wall Thimble (1), 90 Degree Elbow Termination with Vent Screen (1), Thermostat Wire for Remote Connection (1), Pressure Relief Valve (1). $289.21

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Propane Tankless Water Heaters - OUTDOOR Installation
Model # Description Price & Quantity
RTG-74XP-2 Outdoor Propane Tankless Water Heater - 19,000 - 199,900 btu/hr $847.98

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Accessories For All Rheem RTG-74 Series Tankless Water Heaters
These accessories are designed to work with both indoor and outdoor models.
Model # Description Price & Quantity
2SVSNA04.5 Rheem Adapter Stainless Vent Adapter - more gas venting products $34.88
USC2-117 Additional Remotes for RTG-74 Tankless Water Heaters, provides user with an additional remote control that allows them to place at their desired location. It can be adjusted, however not higher than the temperature set on the main remote. $118.64
RTG-20037 Tankless water heater pipe cover for RTG-74 $89.95
RTG-20038 Recess box for tankless water heater RTG-74X and GT-199X only $239.88

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Temperature Pressure Relief Valve is Required on All Water Heaters

Model # BTU Rating Price & Quantity
FVMX-5C 200,000 max $59.33

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to other relief valves


"The Isolator"
Tankless Water Heater Isolation Valves

Tankless water heater isolation valves

Complete inlet/outlet valve system that provides everything you need for a secure installation including full port testing and flushing of the system with easy to install union connections.

Description Price & Quantity
Isolation Valve - Set (Hot & Cold) 3/4" IPS Union x 3/4" IPS $94.57
Isolation Valve - Set (Hot & Cold) 3/4" IPS Union x 3/4" Sweat $94.68
Pressure Relief Valve - Brass - 3/4" - 150 PSI
For the isolation valves shown above
$13.97

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Ultraflow High BTU Stainless Steel Gas Connectors
Ultraflow gas connectors
These gas connectors feature:
  • Pre-assembled
  • Designed for applications with a significant BTU requirement
  • Can supply up to 290,000 BTU (NG) or 465,000 (LP)
  • Increases productivity by eliminating the need for pipe nipples, 90's and elbows
  • Common applications: tankless water heaters, commercial water heaters, furnaces, manufactured homes, boilers, rooftop HVAC units, and gas meters
Description Price & Quantity
Stainless Gasflex - 1"od (3/4"id) x 24" - with adapter to 3/4"fip x 3/4"mip $63.15

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Hot Water Heater Scale Inhibitor System
hot water heater scale inhibitor system
This water heater scale inhibitor system features:
  • 3/4" NPT
  • 6 GPM
  • Cold water feed line
  • Inhibits scale build-up caused by hard water
  • Helps protect piping from corrosion
  • Maintains efficiency and extends life of system
  • Translucent dispenser cartridge allows for convenient detection of remaining scale stopper level
  • Slow dissolve rate for long life and consistent dosing
  • Multi-application design effective on all types of hot water systems-boilers, tankless, and tank-type (gas or electric)
  • Made from FDA CFR-21 compliant materials, suitable for drinking and cooking water and all food applications
  • Replacement cartridges (AP431) are available for these in-line scale inhibitor systems
Description Price & Quantity
Hot Water Heater Scale Inhibitor System $66.10
Replacement filter for hot water heater scale inhibitor system $36.14
Note: Recommended time to change/replace filter cartridge is 6 months.
Purchase a replacement cartridge to have on hand when needed.

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Specifications For RTG-74 Rheem Tankless Water Heaters
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-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

click here to compare Rheem tankless water heaters


Tankless Water Heaters - How It Works

Frequently asked questions about Rheem Tankless Water Heater RTG-74 Series

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.


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