Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The two SENSEI RXP condensing tankless water heaters differ in capacity and efficiency at the top: the RXP160iN prints 0.97 UEF with 160,000 BTU/h and 9.0 GPM, the RXP199iN 0.98 UEF with 199,000 BTU/h and 11.1 GPM. Both share a 15,000 BTU/h minimum and the same cabinet.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Rinnai RXP160iN | Rinnai RXP199iN |
|---|---|---|
| Minimum input (hero bullet) | 15 MBH | 15 MBH |
| Maximum input (hero bullet) | 160 MBH | 199 MBH |
| Uniform Energy Factor (UEF) | 0.97 UEF | 0.98 UEF |
| Domestic hot water flow rate (maximum) | 9 GPM | 11.1 GPM |
| Product weight | 57 lb | 58 lb |
The RXP160iN and RXP199iN are Rinnai's premium condensing tankless pair, both DHW-only water heaters with a 15,000 BTU/h minimum fire and the shared 18.5 x 30.11 x 11.4 in cabinet — 57 lb on the 160 and 58 lb on the 199.
The RXP199iN steps up on both capacity and efficiency: 199,000 against 160,000 BTU/h of maximum input, 11.1 against 9.0 GPM of maximum flow and 0.98 against 0.97 UEF. The higher UEF reflects the larger unit's part-load behaviour in the test cycle.
Both install indoors or outdoors on natural gas or liquid propane with no conversion kit, and both are recirculation-capable, Wi-Fi capable, ENERGY STAR rated and SCAQMD Ultra Low NOx approved. As with all Rinnai tankless models, sizing follows peak hot-water demand, and space heating requires a boiler or combi.
Rinnai
The Rinnai RXP160iN is a SENSEI RXP condensing tankless water heater — a DHW-only appliance, not a boiler — firing 15,000 to 160,000 BTU/h at 0.97 UEF with up to 9 GPM maximum flow.
Rinnai
The Rinnai RXP199iN is a SENSEI RXP condensing tankless water heater — a DHW-only appliance, not a boiler — firing 15,000 to 199,000 BTU/h at 0.98 UEF with up to 11.1 GPM maximum flow.
Maximum input (160,000 against 199,000 BTU/h), maximum flow (9.0 against 11.1 GPM) and UEF (0.97 against 0.98). Both share the same minimum fire and cabinet.
No. The SENSEI RXP models are condensing tankless water heaters for domestic hot water only; they have no space-heating circuit.
The one whose published flow covers the household's peak demand at the coldest expected inlet temperature. The RXP199iN's 11.1 GPM gives more headroom; a licensed contractor should verify the sizing.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.