Canada-wide water heater information · On-site service in Metro Vancouver, BC
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Comparison
Verdict in brief
Both are roughly 199,000 BTU/h indoor condensing natural gas tankless units sold in Canada, and the biggest difference is how they disclose capacity. Navien publishes the NPE-240A2's flow at three temperature rises: 11.2 GPM at a 35 °F rise, 8.7 GPM at 45 °F and 5.6 GPM at 67 °F, which is the honest winter-class figure. Rinnai publishes the RX199iN at a higher UEF 0.98 and an 11.1 GPM maximum flow with no stated rise. Choose by whether you want the published flow-at-rise table and stainless exchangers, or the higher UEF and Wi-Fi controls.
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.
| Specification | Navien NPE-240A2Gas tankless | Rinnai RX199iNGas tankless |
|---|---|---|
| Minimum gas input | 13,300 BTU/h | 15,000 BTU/h |
| Maximum gas input | 199,900 BTU/h | 199,000 BTU/h |
| 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 | — |
| Maximum domestic hot-water flow | — | 11.1 GPM (42 L/min) at unspecified rise rise |
| Uniform Energy Factor (UEF) | 0.95 | 0.98 |
| Vent type | 2 in or 3 in PVC, CPVC, approved polypropylene or stainless steel; special gas vent type BH (Class II A/B/C) | — |
| Vent material | — | PVC, CPVC or polypropylene (condensing) |
| Gas connection | 3/4 in | 3/4 in |
| Condensate drain | — | 1/2 in NPT (13 mm) |
| Electrical supply | 120 V AC, 60 Hz; up to 200 W (2 A), 350 W (4 A) with external pump | 120 V, 60 Hz |
| Height | 27.4 in (696 mm) | 30.11 in (762 mm) |
| Width | 17.3 in (439 mm) | 18.5 in (470 mm) |
| Depth | 13.2 in (335 mm) | 11.4 in (291 mm) |
| Weight | 77 lb (34.9 kg) | 55 lb (24.5 kg) |
| Certification | Listed with flame rod, air-pressure switch, ignition-operation detector and high-limit safety devices | SCAQMD ultra-low-NOx approved |
“—” 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.
Both units are wall-hung indoor condensing tankless heaters in the same input class, with 3/4 in gas and water connections, sealed PVC-family venting, a condensate drain and a 120 V supply, so neither heats during a power outage. Navien publishes an input range of 13,300 to 199,900 BTU/h; Rinnai publishes 15,000 to 199,000 BTU/h. Rinnai lists UEF 0.98 and ENERGY STAR marking; Navien lists UEF 0.95. Both are high-draw-class ratings.
The clearest difference is capacity disclosure. Navien publishes flow at three rises: 11.2 GPM (42.4 L/min) at 35 °F, 8.7 GPM at 45 °F and 5.6 GPM at 67 °F. Because Metro Vancouver's winter incoming water can sit below 8 °C, reaching a 49 °C shower is roughly a 40 °C (72 °F) rise, so the 5.6 GPM at a 67 °F rise is the figure a winter sizing check uses, and two simultaneous showers are assessed against it. Rinnai publishes only an 11.1 GPM (42 L/min) maximum with no stated rise, so its winter flow comes from the flow table in the installation manual rather than a headline.
Recirculation and service differ. Navien supports ComfortFlow recirculation with an external pump or a crossover accessory and lists up to 200 W draw normally, 350 W with an external pump; Rinnai's RX199iN is recirculation-capable with an external pump (the RXP199iN carries it built in). Navien lists a stainless-steel primary and secondary heat exchanger and safety devices including a flame rod, air-pressure switch, ignition-operation detector and high-limit; Rinnai lists SCAQMD ultra-low-NOx approval and Wi-Fi control.
At install, the Rinnai is the lighter and narrower cabinet at 55 lb and 18.5 in wide by 11.4 in deep by 30.11 in high; the Navien is 77 lb and 17.3 in wide by 13.2 in deep by 27.4 in high, so it is shorter but deeper and heavier. Rinnai lists a 1/2 in NPT condensate connection; Navien lists 2 in or 3 in PVC, CPVC, approved polypropylene or stainless BH vent. The installation manual governs materials and lengths, and whether CANRO supplies a given model is confirmed at consultation.
Navien · Gas tankless
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.
Rinnai · Gas tankless
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.
Navien does. The NPE-240A2 is rated 5.6 GPM (21.2 L/min) at a 67 °F rise, which is the winter class for Metro Vancouver. Rinnai publishes the RX199iN at 11.1 GPM with no stated rise, so its winter flow must be read from the manual's flow table.
Rinnai publishes UEF 0.98 against Navien's 0.95 for the NPE-240A2. Both are high-draw-class ratings and the gap is directional, not a promised saving.
Both are condensing units that need sealed PVC-family venting and a condensate drain. Navien lists 2 in or 3 in PVC, CPVC, approved polypropylene or stainless BH; Rinnai lists PVC, CPVC or polypropylene. The manual governs approved materials and lengths.
No on these two models. Navien's NPE-240A2 uses external ComfortFlow equipment; Rinnai's RX199iN is recirculation-capable with an external pump, and the RXP199iN is the built-in-pump variant.
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.
Sources and verification
Facts checked September 21, 2026. Last updated September 21, 2026. Technical reviewer: not yet assigned.