Rinnai RU98eN Outdoor Natural Gas Tankless Water Heater

Stop planning your evenings and mornings around your water heater. Now, you can set your own schedule, all thanks to the RU98eN. It delivers up to 9.8 gallons of hot water per minute while saving energy and money.

Features

  •  ENERGY STAR Qualified
  •  Propane and natural gas models available
  •  Compatible with a full range of Rinnai digital controllers
  •  Enhanced scale detection lessens the possibility of serious, long-term damage
  •  Temperature lock function prevents unauthorized or accidental changes to water temperature
  •  Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels
  •  Built-in Rinnai Circ-Logic recirculation system cycles the external pump at pre-set temperatures and intervals to maximize comfort and efficiency

Warranty

	Item	Years of Coverage (from purchase date)
		Residential use	Residential and space heating	Commercial use
	Heat exchanger	12	10	5
	All other parts	5	5	5
	Reasonable labor*	1 or 5	1or 5	1 or 2
	* Extended labor warranty avaiable the unit is registered with Rinnai within 30 days of purchase.

Click here for more information about the warranty.

Temperature rise (or delta T) in ºF at various flow rates

Feature Table

Model*	Capacity	Input BTUs in thousands		Hot Water Capacity in gallons per minute (GPM)			Energy Factor	Energy Use		Temperature Settings
								Normal, Standby, Anti-Frost
		Min	Max	Activation	Min	Max		Indoor model	Outdoor model	Residential	Commercial**
Value Series - Value and comfort for small to medium homes
V53eN V53eP		19 (N) 20.2 (P)	120	0.6	0.6	5.3	0.82	55 Watts, 2 Watts, 184 Watts	33 Watts, 2 Watts, 74 watts	120°F - 140°F	Residential only
V65iN V65iP V65eN V65eP		10.3	150	0.4	0.26	6.6	0.82	76 Watts, 2 Watts, 120 Watts	57 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 160°F (indoor) 98°F - 185°F (outdoor)
V75iN V75iP V75eN V75eP		10.3	180	0.4	0.26	7.5	0.82	76 Watts, 2 Watts, 120 Watts	57 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 160°F
Luxury Series - High output for larger homes
RL75iN RL75iP RL75eN RL75eP		10.3	180	0.4	0.26	7.5	0.82	76 Watts, 2 Watts, 104 Watts	57 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 160°F
RL94iN RL94iP RL94eN RL94eP		10.3	199	0.4	0.26	9.8	0.82	97 Watts, 2 Watts, 184 Watts	65 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 185°F
Ultra Series - Ultimate efficiency, largest capacity
RU80iN RU80iP RU80eN RU80eP		15.2	152	0.4	0.26	h8	0.96	42 Watts, 2 Watts, 146 Watts	41 Watts, 2 Watts, 168 Watts	98°F - 140°F	98°F - 185°F
RU98iN RU98iP RU98eN RU98eP		15.2	199	0.4	0.26	9.8	0.95	64 Watts, 2 Watts, 146 Watts	63 Watts, 2 Watts, 168 Watts	98°F - 140°F	98°F - 185°F

* e = Exterior/Outdoor; i = Interior/Indoor; N = Natural Gas; P = Liquid Propane
** Commercial controller must be purchased separately

Technical Specifications:

→Type of Appliance: Condensing, Tankless, Temperature controlled, continuous flow, gas hot water system, Energy Star  Qualified
→Rinnai model number: REU-KB3237WD-US
→Operation / Installation: Forced combustion; outdoor only
→Minimum/Maximum Gas Rate (Input): 15,200 / 199,000 BTU/h
→Electrical: Appliance: AC 120 Volts - 60 Hz
 Temperature Controller: DC 12 Volts
→Electrical Consumption: Normal: 63 watts. Standby: 2 watts. Anti-frost protection: 168 watts.
→Ignition System: Direct electronic ignition
→Hot Water Capacity: Minimum flow rate: 0.26 GPM, Minimum activation flow rate: 0.4 GPM, Maximum flow rate: 9.8 GPM
→Temperature: 98° - 120° F (factory default) Maximum temperature is selectable at 120° F or at 140° F; 98° - 185° F available with the MCC-91-2 controller for commercial and hydronic applications                                 
→Temperature (without remote): 120° F (factory default) or 140° F
→Approved Gas Types: Natural or Propane (ensure unit matches gas type)
→Energy Factor (EF): 0.95 Propane: 0.95
→Service Connections Natural Gas: Gas supply: 3/4 inch MNPT. Cold water inlet: 3/4 inch MNPT. Hot water outlet: 3/4 inch MNPT.
→Isolation & Pressure Relief Valves Included: Heavy duty forged brass Webstone Isolator valves EXP E2, certified
  to NSF/ANSI 61-8 for potable water
→Water Flow Control: Water flow sensor, electronic water control and by-pass control
→Minimum/Maximum Water Supply Pressure : 15 - 150 PSI (50 PSI or above is recommended for maximum flow)
→Controller: MC-91-2US (included), Deluxe controller: MC-100V-1US (optional), Bathroom controller: BC-100V-1US (optional), MCC-91-2US (optional; for hydronic and commercial applications)
→Controller Cable: Non-polarized two-core cable, minimum 22 AWG
→Safety Devices: •Flame failure - Flame Rod  •Boiling protection  •Combustion fan rpm check  •Over current - glass fuse  •Remaining flame (OHS)  •Thermal fuse, •Automatic frost protection,
→Clearances from Combustibles: •Top of heater - 12 inches, •Front (Panel) - 24 inches, •Front (Exhaust) - 24 inches, •Back of heater - 0 inches, •Bottom of heater - 12 inches, •Sides of heater - 6 inches,
→Clearances from Non-combustibles: •Top of heater - 2 inches
 * 24 inches require for serviceability •Front (Panel) - 0 inches *, •Front (Exhaust) - 24 inches, •Back of heater - 0 inches, •Bottom of heater - 2 inches, •Sides of heater - 1/8 inch
→Min. / Max. Gas Supply Pressure: Natural Gas: min 5” W.C. max 10.5” W.C., Propane Gas: min 8” W.C. max 13.5” W.C.
→Manifold Gas Pressure (inches W.C.): Natural Gas: high fire 3.0” W.C. low fire 0.46” W.C., Propane Gas: high fire 3.5” W.C. low fire 0.50” W.C.
→Front cover material: Powder coated galvanized steel

Dimensions

Measurement in inches (millimeters)

Documents

• Installation and Operation Manual
• Detailed Specifications: RU98e
• Hot Water Design Manual

Frequently Asked Question

Q1: Can this heater be used with 1/2" pipe?
A1: The normal connection for both gas and water supply is 3/4" MNPT. For gas, you can use other pipe sizes as long as you maintain between 8 and 13.5" of water column. For water, you can use other pipe sizes; but since that will affect your flow rate, your output water temperature will be different from the calculations shown with 3/4" MNPT.

Installation Help and Recommendations

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