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Condensing Propane Tankless Water Heater - Outdoor - 8.4 GPM


Quick Overview

Rheem RTGH-84XLP


The Rheem RTGH-84XLP gas tankless water heaters are energy efficient and propane fueled for homes with up to two bathrooms. It is an outdoor tankless water heater that can be mounted outside the home in a recessed cabinet, helping to maximize indoor space.

The Prestige™ series features the most advanced technology in tankless water heating. Consumers with an existing gas storage tank water heater can often save money by upgrading to a Rheem tankless water heater. The ENERGY STAR® qualified Rheem RTGH-84XLP heats water on demand, eliminating the need for a storage tank with water that needs to continuously be reheated. This results in an overall reduction of propane gas use.


  • 94% energy efficient with stainless steel condensing heat exchanger.
  • Intelligent electronic controls designed to increase energy efficiency and safety.
  • Third party efficiency listed by AHRI.
  • 0.26 GPM minimum flow rate, 0.40 GPM minimum activation flow rate.
  • RTGH-84 for 2-3 bathroom homes– 8.4 gal./min. at 35°F rise max., 6.6 gal./min. at 45°F rise SCAQMD rule 1146.2 compliant.
  • Simple, efficient design – approximately the size of a medicine cabinet.
  • Self-diagnostic system makes installation and service easy.
  • Digital screen displays temperature setting and maintenance codes.
  • Two-pipe direct vent system designed for PVC pipe.
  • Built-in electric blower.
  • Exclusive Guardian overheat film wrap (OFW).
  • EZ-Link cable available for higher demand applications to connect two tankless units to operate as one.
  • Manifold up to six units with an optional MIC-6 manifold control board.
  • Manifold up to 20 units with the optional MIC-185 plus the MICS-180 manifold control assembly.
  • High-altitude capability – up to 9,840 ft. elevation above sea level.
  • Up to 38 ft. of 3" PVC pipe or 5 ft. of 2" PVC pipe.
  • Digital remote control and 10 ft. of thermostat wire included.
  • Freeze protection to -30°F.

Energy Savings

The ENERGY STAR® qualified Rheem Prestige™ condensing tankless water heater is very energy efficient for two reasons:

  1. The Rheem 84-XLP transfers heat very efficiently and effectively. Rheem Prestige™ tankless water heaters feature double-wall heat exchanger that extract most of the heat created by the burning of propane gas. The efficient heat transfer makes it a condensing tankless water heater.
  2. This model eliminates stand-by losses. Due to the lack of a storage tank there is no heat lost when the water heater is not in use, minimizing the waste of propane gas.

These design features result in a 0.94 Energy Factor for the Rheem. This means that 94% of the propane gas used in heating hot water goes towards heating the water as needed. When compared to traditional gas storage tank water heaters, Rheem Prestige™ tankless water heaters have a maximum energy savings of up to 30%.

Rheem tankless water heaters have extremely low activation flow rates of 0.4 gallons per minute. The water heater instantly starts operating when 0.4 gallons of hot water are demanded at any fixture in the home. Rheem tankless water heaters continue to provide hot water at flow rates of as low as 0.26 gallons per minute. The low activation flow rate makes a Rheem RTGH-84XLP a good fit for homes with energy and water saving fixtures.


Energy Type: Propane Gas
Product Type: Outdoor, Condensing
Min. Flow/Activation GPM: 0.26/0.40
Gas Input BTU/H: 11,000 – 157,000
Tank Height: 27.5"
Tank Width: 18.5"
Tank Depth: 9.75"
Ship Weight: 82 lbs
Energy Factor: 0.94


The heat exchanger is warrantied for 12 years for residential or 5 years for commercial. There is a 5-year warranty on parts and a 1-year warranty on labor.

Additional Information

Manufacturer Rheem
BTU 157,000
Installation Location Outdoor
Flow Rate 8.4 GPM
Energy Source Propane
Certifications ENERGY STAR