Gas Tankless Water Heaters

Gas Tankless Water Heaters — Propane & Natural Gas, Indoor & Outdoor

Gas tankless water heaters heat water on demand using either propane or natural gas — no storage tank, no standby heat loss, and no running out mid-shower. This collection covers the full Camplux gas tankless lineup: from a compact 2.64 GPM unit suited to a cabin or secondary suite, up to a 6.86 GPM whole-home model that handles a large household's peak morning demand.

All units in this collection are available in both liquid propane and natural gas configurations. If you're specifically looking for propane-only models for off-grid or rural use, see the Propane Tankless Water Heaters collection. For city homes on the natural gas grid, the Natural Gas Tankless Water Heaters page covers the high-output whole-home options. For no-gas installations, see Electric Tankless Water Heaters.

Choosing the Right GPM for Your Home

Flow rate — measured in gallons per minute (GPM) — is the most important spec when sizing a gas tankless water heater. The right number depends on how many fixtures you're running at the same time and what your incoming water temperature is. In Canada, cold inlet water temperatures in winter reduce the temperature rise a unit can achieve at a given flow rate, so sizing up from a US-based guide is often the right call.

Here's how the Camplux gas tankless lineup maps to typical Canadian household needs:

2.64 GPM (68,000 BTU) — Climatech 3 entry model at $389.99. One bathroom at a time. Suited to a cabin, secondary suite, or small home with low simultaneous demand.
2.64 GPM — White or Black — White ($299.99) and Black ($399.99) versions. Compact indoor units for single-bathroom applications.
3.18 GPM — White ($519.99) and Black ($569.99). Two fixtures running simultaneously in moderate climates — a shower and a kitchen tap, for example.
3.60 GPM — Climatech 3 mid-range at $599.99. A two-bathroom home with moderate simultaneous demand.
4.22 GPM (102,000 BTU) — Climatech 3 high-output ($499.99) and standard 4.22 GPM ($699.99). Two to three simultaneous fixtures. The right choice for most two-bathroom Canadian homes.
5.28 GPM — Indoor gray ($913.99). Three or more simultaneous fixtures. Larger homes or colder provinces where inlet temperatures drop significantly in winter.
6.86 GPM — Indoor — White ($699.99) and Gray ($913.99). High-demand households, multiple bathrooms running simultaneously.
6.86 GPM — Outdoor — White and Gray ($1,299.99). Wall-mounted outdoor installation — no venting required.

Indoor vs. Outdoor Gas Tankless — What's the Difference

Indoor gas tankless water heaters use a sealed combustion chamber and require a dedicated exhaust vent — typically a horizontal run through an exterior wall or a vertical flue. Camplux indoor units are designed for this type of installation and must be vented per Canadian building code. Installation by a licensed gas fitter is required in most provinces.

Outdoor gas tankless water heaters mount directly on an exterior wall and exhaust combustion gases into open air — no interior venting required. This makes them a practical option for cabins, workshops, and properties where running an interior vent isn't feasible. The tradeoff: outdoor units are exposed to weather and must be drained and protected from freezing during Canadian winters when not in use.

If you're unsure which installation type suits your situation, consult a licensed gas fitter before ordering. The installation requirements are different enough that choosing the wrong type creates real problems.

Propane vs. Natural Gas — Which Configuration to Order

Most Camplux gas tankless units are available in both liquid propane (LP) and natural gas (NG) configurations at the same price. The internal components differ — orifice size, gas valve calibration, and regulator settings — so a unit ordered for propane cannot simply be switched to natural gas without a conversion kit.

Order propane if: you're on a propane supply (rural property, cottage, off-grid cabin, or any location without a natural gas line). Order natural gas if: your home is connected to the municipal gas grid and your existing gas line runs to the installation location.

If you're specifically looking for propane models for off-grid or rural use, the Propane Tankless Water Heaters collection focuses on that use case with additional context on propane-specific installation and storage. For city homes on the gas grid, the Natural Gas Tankless Water Heaters page covers the high-output 5.28 GPM outdoor models.

What Canadian Buyers Should Know Before Purchasing

CSA certification is required for gas appliances sold and installed in Canada. All Camplux gas tankless water heaters in this collection are CSA-certified for Canadian use. If you're purchasing for a permitted installation, confirm the specific certification requirements with your local authority having jurisdiction (AHJ).

Cold inlet water temperatures are a real factor in Canadian performance. A unit rated at 4 GPM under standard test conditions may deliver closer to 2.5–3 GPM when the inlet water is near 3°C in a Manitoba January. If you're in a colder province — Manitoba, Saskatchewan, northern Ontario, or Alberta — size up from what a US-based guide recommends.

Gas installation in Canada requires a permit and a licensed gas fitter in most provinces. This applies to both new installations and replacements. Check with your local authority before purchasing if you're unsure about your jurisdiction's requirements.

For a broader comparison of gas vs. electric options, see the Tankless Water Heater overview. For Canadian-specific buying guidance including cold-climate performance notes, see Tankless Water Heater Canada.

Frequently Asked Questions

What is the difference between the Climatech 3 series and the standard Camplux gas tankless units?
The Climatech 3 series (68,000 BTU and 102,000 BTU models) uses a different internal design optimized for residential whole-home use, with a focus on stable temperature output across varying flow rates. The standard lineup covers a wider GPM range and includes both indoor and outdoor configurations. Both series are CSA-certified and available in propane and natural gas.

Can I convert a propane unit to natural gas?
Not without a conversion kit. Propane and natural gas units have different orifice sizes and regulator settings. Order the correct fuel type for your installation. If you're unsure which gas supply you have, check with your gas utility or a licensed gas fitter before ordering.

Do I need a permit to install a gas tankless water heater in Canada?
In most Canadian provinces, yes. Gas appliance installation requires a permit and must be performed by a licensed gas fitter. Requirements vary by province and municipality — check with your local authority having jurisdiction (AHJ) before proceeding.

How do I know if 4.22 GPM is enough for my home?
Add up the flow rates of the fixtures you expect to run simultaneously. A standard shower uses roughly 1.5–2.5 GPM, a kitchen tap around 1–1.5 GPM, and a dishwasher 1–2 GPM. In colder Canadian climates, factor in reduced output at low inlet temperatures. For most two-bathroom homes in moderate climates, 4.22 GPM is sufficient. Larger homes or colder regions may need 5.28 GPM or higher.