Tankless Water Heaters

Camplux tankless water heaters deliver hot water on demand for homes, cabins, RVs and campsites. The residential range covers indoor propane and natural gas heaters from 2.64 to 6.86 GPM, outdoor gas heaters that mount on an exterior wall, and 240 V electric tankless heaters from 8 to 27 kW. Every residential unit is CSA certified, ships free from our warehouse in North Charleston, South Carolina, and is covered by a 30-day money-back guarantee, a 1-year warranty and lifetime support from a US-based team. Browse the full range above, or go straight to gas tankless water heaters, electric tankless water heaters, outdoor tankless water heaters, RV water heaters or portable water heaters for camping.

Camplux tankless water heater lineup

Gas models are rated by flow in gallons per minute (GPM) and heat input in BTU per hour; electric models are rated in kilowatts (kW). Rated flow assumes a typical temperature rise — see the sizing table above for how household size and incoming water temperature change the right pick.

Browse gas models by flow rate: 2.64 GPM, 3.18 GPM, 4.22 GPM, 5.28 GPM or 6.86 GPM. For travel, see electric tankless water heaters for RVs; for a single sink, see electric mini tank water heaters.

Propane, natural gas or electric?

• Propane tankless water heaters work anywhere a propane tank or bulk supply is available, which makes them the usual choice for cabins, rural homes, workshops and off-grid builds. Indoor models need a vent kit; outdoor models vent directly. See indoor propane tankless water heaters.
• Natural gas tankless water heaters connect to an existing gas line and are the lowest-cost option per gallon in most of the US. Camplux 3.18, 4.22, 5.28 and 6.86 GPM models are available in natural gas versions; order the version that matches your supply, as LP and NG units are not field-convertible without a manufacturer kit.
• Electric tankless water heaters need no gas line and no venting, so they fit in closets, under sinks and in apartments. They do need dedicated 240 V circuits: full-load current is about 33 A for 8 kW, 46 A for 11 kW, 58 A for 14 kW, 75 A for 18 kW, 100 A for 24 kW and 113 A for 27 kW, so a 24–27 kW whole-house unit typically requires three dedicated 40 A double-pole breakers and a 150 A or larger service panel. The manual for each model lists the exact breaker count and wire gauge.

Indoor vs. outdoor installation

Indoor gas models must be installed with the vent kit and wall thimble specified in the manual — Camplux indoor units use a 3-inch stainless steel horizontal vent through an exterior wall — with the clearances to combustibles and the combustion-air requirements in the manual and your local gas code. Outdoor models have a weather-resistant housing, vent directly from the unit and need no indoor vent run, which usually makes them the cheaper install on a home with an accessible exterior wall. Outdoor models include built-in freeze protection that switches on below about 41°F (5°C); for extended freezing weather or a power outage, drain the unit. Indoor and outdoor units are not interchangeable: never install an indoor model outside, or an outdoor model inside.

Sizing: flow rate and temperature rise

A tankless heater is sized by two numbers: the flow you need at the same time (a shower uses about 2–2.5 GPM, a kitchen faucet about 1.5 GPM, a washing machine about 2 GPM) and the temperature rise from your incoming water to about 105°F at the tap. Incoming water is around 70°F in Florida and Texas in summer but can fall below 40°F in Minnesota or Maine in winter, so the same heater delivers noticeably less hot flow in a northern winter. In cold-climate states choose one size up, or pair a point-of-use electric unit with a gas whole-house heater for the fixtures furthest from it.

Tankless vs. storage tank water heaters

According to the US Department of Energy, homes that use 41 gallons or less of hot water a day can save 24–34% on water-heating energy with a tankless heater compared with a storage tank, and 8–14% at around 86 gallons a day, because there is no standby loss from a tank of water kept hot all day. Tankless units also last longer — typically 20 years or more against 10–15 for a tank — and a wall-mounted Camplux unit frees the floor space a 40- or 50-gallon tank occupies. The trade-offs are a flow-rate ceiling (two showers plus a dishwasher will exceed a 2.64 GPM unit), a higher upfront price, and the need for correct venting or electrical capacity.

Maintenance

Flush the heat exchanger once a year with white vinegar through an isolation service valve kit, more often in hard-water areas or with a scale filter on the inlet; clean the inlet water filter screen; keep the vent termination clear; and, on outdoor and cabin units, drain the heater before a hard freeze if the power may be off. Replacement parts, vent kits, wall thimbles and service valve kits ship from our US warehouse — see water heater accessories.

Buying from Camplux

Camplux is based in North Charleston, South Carolina, and has built portable propane water heaters since its first campsite shower; the same engineering now goes into every residential unit. Orders ship free from our US warehouse, returns within 30 days are covered with return shipping on us, every residential heater carries a 1-year warranty with lifetime support, and a real person answers at (844) 538-7475, Monday to Friday, 9 am–5 pm ET. Manuals are available at Download manuals.

Answers on this page are written by the Camplux support team from the questions customers ask most. Last updated: October 2026.