10 High Performance Propane Water Heater For Two Story Home Installation of 2026 To Support Multiple Showers

1

Rheem RTG-84DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water

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  9.6
• Brand
  Rheem

Key specs2

Simultaneous Fixture Capacity

3 to 4 simultaneous showers at 8.4 GPM

Venting and Placement

Designed specifically for indoor direct-vent installation, requiring dedicated venting through an exterior wall or roof rather than outdoor mounting.

Pros & cons42

Pros

• Delivers 8.4 GPM at a 35 degree rise with 180,000 BTU to run 3 to 4 simultaneous showers across floors
• Direct-vent indoor configuration allows clean indoor wall-mounting in utility spaces
• Digital control panel supports precision adjustments within plus or minus 1 degree Fahrenheit
• Includes a 15-year heat exchanger warranty and a 5-year parts warranty

Cons

• Requires professional installation and dedicated direct venting through exterior walls or roof
• Lacks built-in Wi-Fi connectivity on this specific non-Wi-Fi model

2

14L Tankless Water Heater Propane with Digital Display 3.66 GPM

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  8.9
• Brand
  Baococo

Key specs1

Intended Application

Engineered for portable outdoor tasks, camping, and RV setups, making it unsuitable for multi-bathroom whole-home plumbing demands.

Pros & cons32

Pros

• Compact lightweight footprint makes it easy to transport for outdoor washing or remote setups
• Generates up to 85,300 BTU heating output with an adjustable range from 17 to 113 degrees Fahrenheit
• Built-in safety shutoffs include freeze protection and low-flow ignition lockout

Cons

• Flow rate of 3.66 GPM and 85,300 BTU cannot sustain simultaneous multi-story household plumbing demand
• Designed strictly for portable outdoor or RV use rather than permanent indoor home installation

3

VEVOR Propane Tankless Water Heater, 5.3Gal Outdoor 120000 BTU Instant

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  9.0
• Brand
  VEVOR

Key specs2

Remote Temperature Control

32.8-foot wired remote control panel included

Plumbing Interface

Standard 3/4 inch NPT connection

Pros & cons42

Pros

• Delivers 120,000 BTU heating power with standard 3/4 inch NPT plumbing connections
• Smart sensors maintain water temperature stability within plus or minus 1 degree Fahrenheit
• Includes a 32.8-foot wired control panel for flexible monitoring away from the outdoor unit
• Multi-point safety system protects against wind pressure, dry burning, and freezing conditions

Cons

• Heating output of 120,000 BTU may struggle to feed simultaneous showers during colder weather
• Outdoor-rated design requires exterior wall space and weather considerations

4

Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water

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  8.7
• Brand
  Rheem

Key specs2

Outdoor Ventless Setup

Mounts to an exterior wall to eliminate multi-floor venting cuts, though exterior placement requires verifying freeze tolerance in colder regions.

Simultaneous Fixture Capacity

2 to 3 simultaneous showers at 7.0 GPM

Pros & cons42

Pros

• Generates 160,000 BTU to supply 7.0 GPM, supporting 2 to 3 simultaneous showers
• Outdoor wall-mount installation completely eliminates the need for indoor exhaust venting
• Maintains consistent temperature within plus or minus 1 degree Fahrenheit via digital control
• Backed by a 15-year heat exchanger warranty and a 5-year parts warranty

Cons

• Exterior installation exposes plumbing to severe outdoor freezing temperatures
• Lacks integrated Wi-Fi monitoring and mobile app controls

5

Westinghouse Tankless Water Heater Propane Indoor, 7.9 GPM 180,000 BTU

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  8.9
• Brand
  Westinghouse

Key specs2

Smart Monitoring Features

Built-in Wi-Fi and voice control via smartphone app

High-Demand Flow Output

Provides up to 7.9 GPM powered by 180,000 BTU, designed to feed up to 5 concurrent fixtures across multi-level layouts without dropping heat.

Pros & cons42

Pros

• Delivers 180,000 BTU and up to 7.9 GPM to handle 3 to 5 simultaneous fixtures without running out
• Built-in Wi-Fi and voice control allow temperature adjustments and alert tracking from a phone
• Self-modulating technology adjusts gas and flow to hold temperature within plus or minus 1 degree
• Standard 3/4 inch NPT plumbing fittings match standard residential whole-home water lines

Cons

• Requires an adjacent 120V AC electrical outlet to power the combustion fan and control board
• Conflicting listing mentions outdoor mounting, so verify indoor direct venting clearances before setup

6

Rheem High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater,

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  8.6
• Brand
  Rheem

Key specs2

Multi-Level Plumbing Capacity

Delivers 8.4 GPM with 180,000 BTU to maintain hot water across 3 to 4 simultaneous fixtures without losing pressure along vertical pipe runs.

Exterior Installation Benefit

Direct exterior mounting eliminates indoor exhaust piping

Pros & cons42

Pros

• High 8.4 GPM capacity and 180,000 BTU heat 3 to 4 simultaneous showers across both floors
• Exterior wall installation bypasses the cost and structural challenges of vertical flue venting
• Modulates temperature precisely within plus or minus 1 degree Fahrenheit on the digital panel
• Includes a 15-year warranty on the heat exchanger alongside a 5-year parts warranty

Cons

• Lacks wireless or mobile app connectivity for adjusting temperatures from inside the house
• Requires professional outdoor gas line installation and freeze-rated exterior pipe insulation

7

Heatrova Propane Gas Tankless Water Heater, 4.3 GPM, 102,000 BTU,

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  7.8
• Brand
  Heatrova

Key specs2

Connection Specifications

Standard 3/4 inch NPT gas and water connections

Thermal Efficiency Rating

Up to 95% thermal efficiency with pure copper exchanger

Pros & cons42

Pros

• Features standard 3/4 inch NPT connections for both water lines and propane supply piping
• Constant Temperature PLUS technology maintains output stability within plus or minus 1 degree
• Integrated pure copper heat exchanger provides fast heat transfer with up to 95 percent efficiency
• Automatic anti-freeze module activates when internal temperatures drop below 39 degrees Fahrenheit

Cons

• Moderate 102,000 BTU and 4.3 GPM output can throttle flow if running two full showers at the same time
• Requires a dedicated 3-inch exhaust vent and a 120V power supply for indoor operation

8

Propane Tankless Water Heater Indoor, 4.8 GPM 110,000 BTU

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  7.7
• Brand
  STPFFOT

Key specs2

Operational Noise Level

DC brushless exhaust fan rated under 30 dB

Minimum Activation Flow

0.6 GPM minimum water flow requirement

Pros & cons42

Pros

• Operates quietly with a DC brushless exhaust fan rated under 30 decibels
• Staged 4-stage combustion system adapts flame levels to smooth out sudden temperature swings
• Low minimum activation flow of only 0.6 GPM prevents short-cycling on minor faucet demands
• Built-in anti-freeze thermostat engages automatically below 40 degrees Fahrenheit

Cons

• Heating output of 110,000 BTU limits peak water volume during cold weather inlet temperatures
• Listing details do not state specific venting diameter or included exhaust duct hardware

9

18L Tankless Water Heater Propane with Digital Display 4.76 GPM

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  7.4
• Brand
  Baococo

Key specs2

Portable Heating Output

115,425 BTU/hr for portable or RV applications

Temperature Range Limits

Adjustable between 17°F and 113°F maximum

Pros & cons32

Pros

• Supplies 115,425 BTU heating output for outdoor washing, camping, or mobile RV applications
• Delivers an on-demand flow rate of 4.76 GPM for steady portable hot water
• Built-in safety features include low-flow ignition lockout, dry burning, and flame failure cutoff

Cons

• Unvented portable build is not designed or code-compliant for permanent indoor home plumbing
• Water temperature adjustment maxes out at 113 degrees Fahrenheit

10

CAMPLUX Climatech 3 Tankless Water Heater Propane 3.6 GPM, 82,000

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  7.4
• Brand
  CAMPLUX ENJOY OUTDOOR LIFE

Key specs2

Cabinet Profile

6.8-inch depth saves space in tight utility rooms

Venting and Port Compatibility

Features 3-inch outer diameter vent sizing and standard 3/4-inch water connections, matching CAMPLUX VP70T venting kits.

Pros & cons42

Pros

• Slim 6.8-inch depth allows easy wall mounting inside compact utility closets and laundry rooms
• Uses standard 3/4 inch NPT water ports and common 3-inch outer diameter venting connections
• Smart sensors maintain water temperature within a narrow plus or minus 1 degree variation
• Freeze protection system activates below 39 degrees Fahrenheit to guard internal piping

Cons

• Output of 82,000 BTU and 3.6 GPM cannot keep up with simultaneous showers across two floors
• Requires a 1/2 inch NPT gas line and an accessible 120V electrical outlet for the power plug

Last update on 2026-10-11 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Can a propane water heater supply multiple fixtures on both floors at the same time?

Yes, but uninterrupted multi-story flow depends on the heating capacity and flow rate. Units producing between 160,000 and 180,000 BTU deliver 7.0 to 8.4 GPM at a 35°F temperature rise, which provides the output required for simultaneous upstairs and downstairs use. A unit rated at 4.8 GPM and 110,000 BTU specifically lists support for 3 to 4 hot water points at once, while a 3.6 GPM model with 82,000 BTU supports 2 to 3 fixtures. Matching your home's peak fixture count to these ratings prevents temperature dips when someone starts a wash downstairs while an upstairs shower is running.

Should you install an indoor direct-vent model or an outdoor unit in a two-story home?

Outdoor units eliminate the need to run vertical exhaust piping through a second floor or attic space. Models designed for outdoor mounting attach directly to an exterior wall, avoiding internal ductwork entirely. Indoor propane units require dedicated venting pathways, such as a 3-inch OD vent pipe, alongside electrical connections like a 120V plug. If routing flue pipes through multiple finished ceilings or upper bedrooms is impractical, an exterior wall mount offers a simpler layout.

Will existing propane lines provide enough fuel for a high-output water heater?

You must confirm your gas supply line size and delivery pressure against the heater's BTU rating. High-capacity whole-house models draw between 160,000 and 180,000 BTU, whereas compact options operate at 82,000 to 110,000 BTU. While an 82,000 BTU heater can connect to a 1/2-inch NPT gas inlet, larger burners require greater fuel volume to avoid flame starvation during peak multi-bath demand. Check your propane tank regulator and consult the manufacturer specification sheet to ensure your line diameter supports the unit's maximum heat rating.

What plumbing connection sizes are required to maintain water pressure across two levels?

Standard 3/4-inch NPT water inlet and outlet connections help maintain adequate volume through extended vertical plumbing runs. Several models, including 3.6 GPM and 4.3 GPM options, use standard 3/4-inch NPT water connections to prevent bottlenecks at the heater interface. If long pipe runs between the heater and an upper bathroom cause delivery delays, you can check an instant hot water heater for dedicated point-of-use fixtures to reduce wait times.

How does precision temperature control stop shower temperatures from fluctuating?

Smart temperature sensors actively monitor incoming water changes and burner output to prevent sudden cold bursts. Units with precision temperature controls maintain output within plus or minus 1°F of the selected setting, avoiding noticeable heat swings when additional taps open. Look for models with digital control panels or app management to dial in exact degrees, ensuring upper-floor showers stay stable regardless of lower-level water use.

What physical dimensions and space requirements should you plan for?

Propane tankless units vary significantly in size and weight based on their venting and capacity design. Smaller indoor units measure around 6.8 by 6.8 by 21.3 inches and weigh 20.5 pounds, while high-output models reach 10.27 by 13.5 by 24.2 inches at 46.5 pounds, or 17.1 by 17.1 by 26.8 inches. Exterior models often measure around 9.4 by 13.5 by 20.75 inches with a weight of 39.25 pounds. Check the manufacturer manual to confirm necessary wall clearances and service access before mounting.