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Water heaters · System type

Gas tankless water heaters

Wall-hung units that heat water only while a tap runs, with inputs up to 199,000 BTU/h. Capacity is a flow rate at a temperature rise, not a volume; condensing models reach UEF 0.90 to 0.98 and vent in PVC.

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In short

A gas tankless water heater fires when flow is detected and modulates its burner to hold the set temperature. It delivers continuous hot water at a limited flow that falls as the required temperature rise grows, needs a minimum flow to activate, and is not instant at a distant tap. It needs sealed venting, a gas supply sized for its input, a condensate drain (condensing models) and 120 V power, and annual descaling.

How a tankless unit works

A flow sensor detects demand, the fan proves airflow, the igniter lights the burner and the control modulates gas to hold the outlet temperature as flow changes. Condensing models add a secondary heat exchanger that recovers heat from the flue gas, which raises efficiency and produces acidic condensate that must be drained and usually neutralized. Non-condensing models vent hotter gases through stainless steel and have lower UEF.

Capacity is flow at a temperature rise

Manufacturers publish a maximum flow, often at a small or unstated temperature rise, and a flow curve that shows how much less the unit delivers as the rise increases. In Metro Vancouver's winter, incoming water can be below 8 °C, so reaching 49 °C is about a 40 °C (72 °F) rise. A shower needs roughly 7.5 to 9.5 L/min, two showers about 17 L/min at that rise. Sizing compares that against the unit's flow at the winter rise, never against the brochure maximum, and never across different rises. Units also need a minimum flow, typically 1.5 L/min, to fire.

Recirculation and the wait for hot water

Tankless is continuous, not instant. Hot water still travels through the pipes, and the unit takes a few seconds to reach temperature. A recirculation system, with a pump and either a dedicated return line or a crossover valve at the far fixture, shortens the wait but adds cost and gas use. Some models have the pump built in; others support an external pump through their control.

Installation and maintenance

Condensing units vent in 2" or 3" PVC, CPVC or polypropylene within a stated equivalent length, need a 3/4" gas connection on a supply that can carry up to 199,000 BTU/h, a condensate drain and a 120 V receptacle. Isolation valves are required for the annual flush, which manufacturers make a warranty condition; lime damage is typically excluded. Every installation in BC needs a gas permit.

Strengths

  • Continuous hot water for sequential use
  • High UEF (0.90–0.98 condensing); no standby tank loss
  • Wall-mounted; frees floor space
  • Long heat-exchanger warranties when registered and maintained

Limitations

  • Flow is limited at the winter rise; several fixtures at once may exceed one unit
  • Higher installed cost, especially as a conversion
  • Needs 120 V power; no hot water in an outage
  • Annual descaling is a warranty condition; not instant at distant taps

Components that apply

Catalogue

Gas tankless models documented

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Rinnai · Gas tankless

Rinnai RU130iN

CurrentSold in Canada
Max input
130,000 BTU/h
Flow at unspecified rise rise
7 GPM (26 L/min)
Uniform Energy Factor (UEF)
0.91

The Rinnai RU130iN is an indoor condensing natural gas tankless water heater with a 15,000–130,000 BTU/h input, UEF 0.91 and up to 7 GPM (26 L/min) of flow at an unstated temperature rise. It is listed on rinnai.ca and is the smallest residential RU model, suited to one-bathroom homes and suites.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Rinnai · Gas tankless

Rinnai RU160iN

CurrentSold in Canada
Max input
160,000 BTU/h
Flow at unspecified rise rise
9 GPM (34 L/min)
Uniform Energy Factor (UEF)
0.95

The Rinnai RU160iN is an indoor condensing natural gas tankless water heater with a 15,000–160,000 BTU/h input, UEF 0.95 and up to 9 GPM (34 L/min) of flow at an unstated temperature rise. It is listed on rinnai.ca and is the mid-size RU model between the RU130i and RU180i.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Rinnai · Gas tankless

Rinnai RU180iN

CurrentSold in Canada
Max input
180,000 BTU/h
Flow at unspecified rise rise
10 GPM (38 L/min)
Uniform Energy Factor (UEF)
0.95

The Rinnai RU180iN is an indoor condensing natural gas tankless water heater with a 15,000–180,000 BTU/h input, UEF 0.95 and up to 10 GPM (38 L/min) of flow at an unstated temperature rise. It is listed on rinnai.ca and sits one step below the flagship RU199iN.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Rinnai · Gas tankless

Rinnai RX199iN

CurrentSold in Canada
Max input
199,000 BTU/h
Flow at unspecified rise rise
11.1 GPM (42 L/min)
Uniform Energy Factor (UEF)
0.98

The Rinnai RX199iN is Rinnai's current flagship indoor condensing natural gas tankless water heater in Canada: 15,000–199,000 BTU/h, UEF 0.98, up to 11.1 GPM (42 L/min) maximum flow at an unstated rise, Wi-Fi control and ENERGY STAR marked on rinnai.ca. It is the RX successor to the RU199iN.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Rinnai · Gas tankless

Rinnai RX180iN

CurrentSold in Canada
Max input
180,000 BTU/h
Flow at unspecified rise rise
10.0 GPM (38 L/min)
Uniform Energy Factor (UEF)
0.98

The Rinnai RX180iN is an indoor condensing natural gas tankless water heater in Rinnai's current RX flagship series: 15,000–180,000 BTU/h, UEF 0.98, up to 10.0 GPM (38 L/min) maximum flow at an unstated rise, Wi-Fi control and ENERGY STAR marked on rinnai.ca.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Rinnai · Gas tankless

Rinnai RXP199iN

CurrentSold in Canada
Max input
199,000 BTU/h
Flow at unspecified rise rise
11.1 GPM (42 L/min)
Uniform Energy Factor (UEF)
0.98

The Rinnai RXP199iN is the RX199iN with a built-in recirculation pump: 15,000–199,000 BTU/h, UEF 0.98, up to 11.1 GPM (42 L/min) maximum flow, Wi-Fi control and ENERGY STAR marked on rinnai.ca. It is Rinnai Canada's pump-included flagship.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Navien · Gas tankless

Navien NPE-240A2

CurrentSold in Canada
Max input
199,900 BTU/h
Flow at 35 °F (19.4 °C) rise
11.2 GPM (42.4 L/min)
Uniform Energy Factor (UEF)
0.95

The Navien NPE-240A2 is the largest of Navien's Canadian A2 condensing tankless models: 13,300–199,900 BTU/h on natural gas or propane, UEF 0.95, and published flows of 11.2 GPM at a 35 °F rise and 5.6 GPM at a 67 °F rise. It is a wall-hung, forced-draft direct-vent unit.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Navien · Gas tankless

Navien NPE-210A2

CurrentSold in Canada
Max input
180,000 BTU/h
Flow at 35 °F (19.4 °C) rise
10.1 GPM (38.2 L/min)
Uniform Energy Factor (UEF)
0.95

The Navien NPE-210A2 is the middle of Navien's Canadian A2 condensing tankless models: 12,000–180,000 BTU/h on natural gas or propane, UEF 0.95, and published flows of 10.1 GPM at a 35 °F rise and 5.1 GPM at a 67 °F rise. It is a wall-hung, forced-draft direct-vent unit.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Navien · Gas tankless

Navien NPE-180A2

CurrentSold in Canada
Max input
150,000 BTU/h
Flow at 35 °F (19.4 °C) rise
8.4 GPM (31.8 L/min)
Uniform Energy Factor (UEF)
0.95

The Navien NPE-180A2 is the smallest of Navien's Canadian A2 condensing tankless models: 10,000–150,000 BTU/h on natural gas or propane, UEF 0.95, and published flows of 8.4 GPM at a 35 °F rise and 4.3 GPM at a 67 °F rise. It is a wall-hung, forced-draft direct-vent unit.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Navien · Gas tankless

Navien NPE-240S2

CurrentSold in Canada
Max input
199,900 BTU/h
Flow at 35 °F (19.4 °C) rise
11.2 GPM (42.4 L/min)
Uniform Energy Factor (UEF)
0.96

The Navien NPE-240S2 is the largest of Navien's current S2 condensing tankless models: 13,300–199,900 BTU/h on natural gas or propane, UEF 0.96, and published flows of 11.2 GPM at a 35 °F rise and 5.8 GPM at a 67 °F rise.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Navien · Gas tankless

Navien NPE-210S2

CurrentSold in Canada
Max input
180,000 BTU/h
Flow at 35 °F (19.4 °C) rise
10.1 GPM (38.2 L/min)
Uniform Energy Factor (UEF)
0.96

The Navien NPE-210S2 is the middle of Navien's current S2 condensing tankless models: 12,000–180,000 BTU/h on natural gas or propane, UEF 0.96, and published flows of 10.1 GPM at a 35 °F rise and 5.3 GPM at a 67 °F rise.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Navien · Gas tankless

Navien NPE-180S2

CurrentSold in Canada
Max input
150,000 BTU/h
Flow at 35 °F (19.4 °C) rise
8.4 GPM (31.8 L/min)
Uniform Energy Factor (UEF)
0.96

The Navien NPE-180S2 is the smallest of Navien's current S2 condensing tankless models: 10,000–150,000 BTU/h on natural gas or propane, UEF 0.96, and published flows of 8.4 GPM at a 35 °F rise and 4.3 GPM at a 67 °F rise.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Rinnai · Gas tankless

Rinnai RU199iN

CurrentSold in Canada
Max input
199,000 BTU/h
Flow at unspecified rise rise
11 GPM (42 L/min)
Uniform Energy Factor (UEF)
0.95

The Rinnai RU199iN is an indoor condensing natural gas tankless water heater with a 15,000–199,000 BTU/h input, UEF 0.95, 2" PVC venting and up to 11 GPM (42 L/min) of flow at an unstated temperature rise. It is listed on rinnai.ca and is the largest residential RU model, with a propane version, the RU199iP.

Natural gasPropaneCondensing, PVC/CPVC/PP
Specifications, manuals and service

Services for this type

Guides

Frequently asked questions

Is tankless unlimited hot water?

No. It is continuous hot water at a limited flow. Exceed the flow the unit can deliver at the winter rise and every tap gets cooler.

Do I need recirculation?

Only if the wait at a distant tap matters to you. It shortens the wait, adds cost and gas use, and needs a return line or crossover valve.

How much gas does a tankless unit use?

Up to its maximum input, 199,000 BTU/h on the largest residential units, while running, which is about five times a 40,000 BTU/h tank. That is why the gas line is checked at assessment.

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Sources and verification

Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.

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