With the Rheem Tankless Water Heater RTG53XN, showers start hot and stay hot for as long as the shower is running, plus the system is much smaller than normal tank water heaters and uses much less energy.

The Rheem RTG53XN tankless hot water heater is an Outdoor unit powered by Natural Gas that turns on when you open a hot water faucet and turns off when you close the faucet, so the energy consumed is only for the hot water being used. Since there is no storage of hot water and thus no constant heating and re-heating of stored hot water, you're not wasting energy heating water when you don't need it.

Key features include: 5.3 gpm at a 45ºF temperature rise; electronic ignition to increase efficiency; remote control thermostat; digital temperature display; built-in electric blower to force exhaust gas outside; environmentally friendly low NOx burner; and a 3-year limited warranty on parts (10 years on heat exchanger.)

The Rheem Tankless Water Heater RTG53XN is a revolution in home water heating that provides instant gratification with the satisfaction of being environmentally friendly and cost efficient at the same time!

Temperature Increase / Gallons Per Minute:

• Flow Rate at 45ºF Rise: 5.3 gpm
  
• Flow Rate at 60ºF Rise: 3.9 gpm
  
• Flow Rate at 70ºF Rise: 3.4 gpm
  
• Flow Rate at 80ºF Rise: 3.0 gpm
  
• Flow Rate at 90ºF Rise: 2.6 gpm

Warning: This water heater is not suitable for use in manufactured (mobile) homes!

Height: 20-1/2"

Width: 13-3/4"

Depth: 5-1/4"

Primary Specifications:

• Model: RTG53XN
• 5.3 gpm at a 45ºF temperature rise (up to 6.8 gpm at 35ºF)
• Electronic ignition increases efficiency (no standing pilot light)
• A remote control thermostat is included with all models with 100ºF - 140ºF setpoint range (factory set at 120ºF)
• Environmentally friendly Low NOx burner meets SCAQMD rule 1146 requirements
• Freeze protection to -30ºF
• UMC-117 remote control
• Warranty: 3-year limited warranty on parts (10 years on heat exchanger.)
• Rheem Tankless Water Heater - Outdoor, Natural Gas
• Guardian OFW(TM) overheat film wrap
• Digital display on thermostat shows temperature setting and maintenance/error codes
• Built-in electric blower to force exhaust gas to the outside
• EZ-Link(TM) cable connects two like units to operate as one, doubling capacity
• Weight: 36 pounds
• Dimensions: 20-1/2"h x 13-3/4"w x 5-1/4"d

Technical Specifications:

• # Of Applications: 1-2 showers concurrently
• Water Connection: 3/4" NPT
• Gas Connection: 3/4" NPT
• Energy Factor: .82
• Temperature Range: 100 - 140 degrees
• Ignition: Electric
• BTU: 145,000
• Dimensions: H 20½" x W 13¾" x D 5¼”
• Weight 36 lbs.
• 10 Year Warranty; 3 Year on heat exchanger
• Comes with remote control for thermostat

Minimum Clearances For Installation:

• Top = 12”
• Front = 12”
• Side = ½”
• Bottom = 12”
• Back = 0”

Energy Requirements

• Ignition: Electric (120 V)
• Power Natural Gas: 145,000 BTU
• Energy Factor: .82

***Our Recommended Accessories:

• BrassCraft 36" Long Stainless Steel Gas Connector w/ Pro Coating - Every gas water heater requires a gas connector and this model is our recommended top pick. We highly recommend this particular model for saving you time and money!  Also available in different lengths if required - simply call us toll free at 888-793-2665.
• Rheem Tankless Water Heater High Altitude Chip - Required if heater will be used above 3200 ft.
• Sioux Chief Gas Tankless Water Heater Connector Set - Required to connect all gas tankless water heaters to the corresponding water and gas lines. Includes pressure relief valve.

You may download a product owner's manual below:

• Download Product Specification Sheet (PDF)

• Download Product Owner's Manual (PDF)

• Get Adobe Acrobat Reader

**Please note, Adobe Acrobat Reader is required to view pdf files

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Usually Ships Same Business Day

This item ships UPS or FedEx ground. Delivery times related to these ship methods are usually between 2 and 5 business days once the product leaves the warehouse. We will email you tracking information once the product leaves our warehouse. UPS or FedEx ground deliveries do not require a signature and may be left at the ship to location. All deliveries will occur Monday through Friday.

UPS or FedEx ground deliveries do not include a guaranteed delivery date. Should you require a specific delivery date or expedited shipping please add the item to the shopping cart and view the shipping options drop down box. If the product is eligible for expedited shipping the shipping options and pricing will be listed. Please contact our customer service department with any questions related to shipping. (800) 297-6076, M-F, 8am to 5pm CST.