With the Rheem Direct Vent Natural Gas Tankless Water Heater (model: RTG66DVN), 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 RTG66DVN tankless water heater is an indoor 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: 6.6 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 5-year limited warranty on parts (12 years on heat exchanger) and 1-year on labor.

The Rheem Tankless Water Heater RTG66DVN 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. This Rheem Direct Vent Natural Gas Tankless Water Heater (model: RTG66DVN) is perfect for 2 - 3 bathroom homes.

Temperature Increase / Gallons Per Minute:

• Flow Rate at 35ºF Rise: 8.4 gpm
• Flow Rate at 45ºF Rise: 6.6 gpm
  
• Flow Rate at 50ºF Rise: 5.9 gpm
  
• Flow Rate at 60ºF Rise: 4.9 gpm
• Flow Rate at 70ºF Rise: 4.2 gpm
  
• Flow Rate at 77ºF Rise: 4.0 gpm
• Flow Rate at 80ºF Rise: 3.6 gpm
• Flow Rate at 90ºF Rise: 3.3 gpm
  
• Flow Rate at 100ºF Rise: 2.9 gpm

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

Height: 25 5/8"

Width: 13 7/8"

Depth: 9 7/8"

Primary Specifications:

• Model: RTG66DVN
• Rheem Tankless Water Heater - Indoor, Natural Gas
• 6.6 gpm at a 45ºF temperature rise (up to 8.4 gpm at 35ºF)
• Vents concentrically with 3/5" stainless steel venting from Metal Fab or Heat Fab
• High altitude capability - up to 9840 ft. elevation above sea level (no chip required)
• Electronic ignition increases efficiency (no standing pilot light)
• 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
• UMC-117 remote control
• Guardian SBT(TM) sensing burner technology
• 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
• EZ-Link(TM) cable connects two like units to operate as one, doubling capacity
• Warranty: 5-year limited warranty on parts (12 years on heat exchanger.)
• Weight: 54 pounds
• Dimensions: 25 5/8"h x 13 7/8"w x 9 7/8"d

Technical Specifications:

• # Of Applications: 2-3 showers concurrently
• Water Connection: 3/4" NPT
• Gas Connection: 3/4" NPT
• Energy Factor: .82
• Temperature Range: 100 - 140 degrees
• Ignition: Electric
• Exhaust Hose Diameter: 3 by 5 inches
• Combustion Air Pipe Size: 3 by 5 inches
• BTU: 11,000 - 180,000
• Dimensions: H 25 5/8 ” x W 13 7/8” x D 9 7/8”
• Weight: 54 lbs.
• 5 Year Warranty; 12 Year on heat exchanger
• Comes with remote control for thermostat

Venting (Exhaust)

• Diameter: 3 by 5 inch
• Material: Stainless Steel (AL29-4C) sealed
• Minimum length: 1 ft. if used with 90 degree elbow, wall thimble and exhaust vent hood.
• Maximum length: 47.6 ft. (10.5m) with one 90 degree elbow. Less 5 ft. for each additional 90 degree elbow (2.5 ft for each 45 degree elbow)

Venting (Intake)

• Diameter: 3 by 5 iinch
• Material: PVC, Aluminum or Galvanized
• Minimum length: 3 ft.
• Maximum length: same or less than the length of the exhaust vent

Minimum clearances for installation

• Top = 12”
• Vent = 2”
• Front = 12”
• Side = ½”
• Bottom = 12”
• Back = 0”

Energy Requirements

• Ignition: Electric (120 V)
• Power Natural Gas: 199,900 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.
• 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.

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• Download Product Specification Sheet (PDF)

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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.