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Comparison

Rinnai RU199iN vs Navien NPE-240A2

Verdict in brief

Both are 199,000 BTU/h-class condensing tankless flagships common in Metro Vancouver. The honest difference is in how capacity is published: Navien states the NPE-240A2's flow at three temperature rises (11.2 GPM at 35 °F, 5.6 GPM at 67 °F), while Rinnai's RU199iN maximum of 11 GPM carries no stated rise, so the two are only compared at the rise that matters. At Metro Vancouver's winter rise both deliver roughly 5 to 6 GPM, and the choice falls to warranty, service support and the specific installation.

Side by side

Published manufacturer figures with units. Storage and flow figures are different measures and are shown on their own rows; blanks mean not applicable or not published.

Comparison of Rinnai RU199iN and Navien NPE-240A2
SpecificationRinnai RU199iNGas tanklessNavien NPE-240A2Gas tankless
Maximum gas input199,000 BTU/h199,900 BTU/h
Maximum flow with parameter adjustment11 GPM (42 L/min) at unspecified rise rise—
Flow at a 35 °F (19.4 °C) rise—11.2 GPM (42.4 L/min) at 35 °F (19.4 °C) rise
Flow at a 45 °F (25 °C) rise—8.7 GPM (32.9 L/min) at 45 °F (25 °C) rise
Flow at a 67 °F (37.2 °C) rise—5.6 GPM (21.2 L/min) at 67 °F (37.2 °C) rise
Minimum activation flow0.4 GPM (1.5 L/min)0.5 GPM (1.9 L/min); under 0.01 GPM option in ComfortFlow mode
Uniform Energy Factor (UEF)0.950.95
Height26.4 in (670 mm) cabinet; 31.3 in (795 mm) with fittings per rinnai.ca27.4 in (696 mm)
Weight64 lb (29 kg)77 lb (34.9 kg)
Condensate drain1/2 in NPT (13 mm)—
Gas connection3/4 in MNPT (19 mm)3/4 in
Water connections3/4 in MNPT cold in and hot out3/4 in cold inlet and hot outlet

“—” means not applicable to that system type or not published by the manufacturer. Flow figures are only comparable at the same temperature rise; UEF values are only comparable within the same draw pattern.

What actually separates them

Capacity is where the comparison must be disciplined. Navien publishes the NPE-240A2's flow at 35, 45 and 67 °F rises, and Rinnai publishes the RU199iN's rated range and an 11 GPM maximum with no stated rise, with flow curves valid only below 21 °C inlet. In a Metro Vancouver January the rise to 49 °C approaches 40 °C (72 °F), so the Navien 67 °F figure (5.6 GPM) and the Rinnai flow-at-rise table are the comparable numbers, and both land in the 5 to 6 GPM zone.

Efficiency: the RU199iN rates UEF 0.95 and the NPE-240A2 UEF 0.95, both high-draw-class tankless ratings; neither number is a savings percentage and the two are not compared with other draw patterns.

Physically, the NPE-240A2 is a larger and heavier cabinet (27.4 in high, 77 lb) than the RU199iN (26.4 in, 64 lb), with the Navien's 3/4 in connections, 2 in or 3 in venting, and forced-draft direct-vent configuration; the RU vents in 2 in PVC-family pipe within its equivalent-length tables.

Both brands are named by CANRO on its own pages. Warranty terms, registration and the local support story are confirmed at consultation, and either unit is sized by flow at the winter rise, never by the brochure maximum.

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

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

Frequently asked questions

Which is better: Rinnai or Navien?

This site does not rank brands or declare winners. Both are established condensing platforms with different published data styles; the comparison table shows the figures and the fit-for-use notes, and the assessment matches a unit to the house.

Can I compare their maximum GPM?

No: Navien states its maximums at a 35 °F rise while Rinnai's RU maximum carries no stated rise. The only honest comparison is flow at the same rise from each manufacturer's tables.

Not sure which one fits your home?

A consultation includes a hot-water demand review so capacity is right for your winter, not the brochure's.

On-site service in Metro Vancouver, BC. Call to check availability.

Call 604-359-1081Request a consultation

Related

Sources and verification

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

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