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Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White

Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White

5(236 ratings)

Best price now

$286.99at CampluxChecked 1 h ago

28% under what the other stores charge

Compared across 11 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $286.99 at Camplux (checked Nov 12, 2026).
  • Checked at 11 stores.

Our take on the Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White

The Camplux 3.18 GPM is an indoor tankless water heater that runs on propane or natural gas and delivers up to 3.18 gallons per minute of on-demand hot water. It fires on water flow rather than pressure, with an activation range of 0.65 to 4.8 GPM and a maximum input of 82,000 BTUs. It uses standard 1/2-inch NPT water and gas connections and a 2.3-inch horizontal vent, which keeps installation simple for whole homes, cabins and remote apartments. It suits two to three people; larger households or multi-shower use will want a higher-GPM unit.

Best forSmall homes and cabins for 2-3 peopleRemote apartments off a propane supplyReplacing a tank heater where space is tightOwners who want a simple 1/2-inch NPT hookup
Pros
  • On-demand hot water with no tank to store
  • Runs on either propane or natural gas
  • Activates on low flow from 0.65 GPM
  • Standard 1/2-inch NPT water and gas fittings
  • Compact wall-mounted indoor unit
Cons
  • 3.18 GPM limits simultaneous hot-water use
  • Indoor installation needs proper venting
  • Flow-activated design needs minimum water pressure to start

Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White prices at every store

  • WayfairNew

    In stock

    $350.99Free shippingChecked 1 h ago
    Visit Wayfair
  • Renewable OutdoorsNew

    In stock

    $379.99Free shippingChecked 1 h ago
    Visit Renewable Outdoors
  • Shop Tiny HousesNew

    In stock

    $399.99Free shippingChecked 1 h ago
    Visit Shop Tiny Houses
  • CampluxNew

    Availability unknown

    $286.99Free shippingChecked 1 h ago
    Visit Camplux
  • Tractor Supply CompanyNew

    Availability unknown

    $319.99Checked 1 h ago
    Visit Tractor Supply Company
  • Lowe'sNew

    Availability unknown

    $348.15Checked 1 h ago
    Visit Lowe's
  • GTFOverlandNew

    Availability unknown

    $399.99Checked 1 h ago
    Visit GTFOverland
  • ShopNew

    Availability unknownSold by Shop app

    $399.99Checked 1 h ago
    Visit Shop
  • Juniper OverlandNew

    Availability unknown

    $399.99Checked 1 h ago
    Visit Juniper Overland
  • Truck Camper GarageNew

    Availability unknown

    $399.99Checked 1 h ago
    Visit Truck Camper Garage
  • RackUp+GoNew

    Availability unknown

    $399.99Checked 1 h ago
    Visit RackUp+Go

Also available at

  • CampluxCheck price at Camplux

Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White price history

Lowest price we've seen: $286.99 on Nov 12 at Camplux. Tracked across 11 stores since Nov 12.

What reviewers say

  • 5 / 5236 ratings

Rated 5 out of 5 across 236 ratings, buyers are largely satisfied with the unit's steady hot water and straightforward install.

What people mention
  • Hot water supplyPraisedBuyers say it delivers constant hot water without running out.
  • InstallationPraisedOwners report the standard 1/2-inch NPT connections make setup quick.
  • CapacityMixedSome note 3.18 GPM is tight when several fixtures run at once.

About the Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White

This is a tankless gas water heater that runs on propane or natural gas and heats water on demand. It delivers 3.18 gallons per minute and is meant for 2 to 3 people. It activates by water flow rather than water pressure, with an activation flow range of 0.65 GPM to 4.8 GPM.

The heater has an oxygen-free copper heat exchanger and a V-type stainless steel burner, with heating efficiency of up to 89.98%. A 90° wind isolation design helps prevent wind from flowing back on high floors. The 2.36-inch stainless steel vent pipe carries exhaust gases out quickly. The front panel is black glass with an LED touchscreen for setting the water temperature, which can switch between Fahrenheit and Celsius. The unit is compact and takes up less space than a traditional tank.

It connects with a standard 1/2-inch NPT water fitting and gas inlet, and a 2.3-inch horizontal vent pipe is included. Protection features include dry combustion protection, a flame failure device, anti-freezing protection and overheating protection. It also has fully automatic temperature control, an energy-saving mode and a child lock. Use it only outdoors or indoors with proper ventilation, and install it according to local gas and plumbing regulations.

Fuel type
Propane or natural gas
Flow rate
3.18 GPM
Activation flow
0.65 GPM to 4.8 GPM
Max input
82,000 BTUs
Heating efficiency
Up to 89.98%
Water connection
Bottom, 1/2-inch NPT
Gas inlet
1/2-inch NPT
Heat exchanger
Oxygen-free copper
Burner
V-type stainless steel
Vent pipe
2.36-inch stainless steel; 2.3-inch horizontal vent pipe included

Questions and answers

Does it run on propane or natural gas?
It accepts either propane or natural gas. Confirm the gas type and supply pressure before installing.
How many people can it serve?
It is rated for about two to three people. Running a shower and another hot fixture at the same time will stretch its 3.18 GPM output.
What water pressure does it need to start?
It activates on water flow, not pressure, starting at 0.65 GPM. Flow above 4.8 GPM exceeds its rated range.
What connections does it use?
Water and gas inlets are standard 1/2-inch NPT at the bottom. The vent is a 2.3-inch horizontal pipe.
Can it be installed outdoors?
No, it is an indoor unit. It needs a proper horizontal vent run to the outside.
Where is the Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White cheapest?
At Camplux, for $286.99, 28% under what the other stores charge, as of our latest check.
What do buyers say about the Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White?
Rated 5 out of 5 from 236 ratings.
Where can I buy the Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White?
11 stores we checked sell it, including Camplux, Tractor Supply Company, Lowe's, Wayfair, Renewable Outdoors.

Stores we've priced the Indoor Propane/Natural Gas Tankless Water Heater 3.18 GPM | White at

  • Lowe's deals and prices
  • RackUp+Go deals and prices
  • Shop deals and prices
  • Tractor Supply Company deals and prices
  • Wayfair deals and prices
Controls
LED touchscreen, Fahrenheit/Celsius switch
Safety features
Dry combustion, flame failure device, anti-freezing, overheating protection, child lock
Color
White
Tank hookup
Requires a gas regulator (Camplux model KR-106A) and one 5/8-inch NPT male to 1/2-inch BSP female gas connector adapter
Optional accessory
Stainless steel wall thimble WT236

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