Product image from current catalog dataProduct overview
Rinnai RU199iN Condensing Tankless Water Heater: What to Know
Per the listing's own feature bullets, the RU199iN provides what Rinnai describes as endless hot water flow throughout the house, with a compact, space-saving design that only heats water when needed rather than maintaining a standing tank of hot water around the clock. The unit is ENERGY STAR qualified with a stated 0.105 Uniform Energy Factor figure referenced in search summaries of this listing (note: UEF for condensing tankless units is typically reported closer to 0.9+ under current standards — confirm the exact current UEF rating on Rinnai's own spec sheet if that precise figure matters for a rebate application).
The listing describes Circ-Logic technology, which Rinnai states can pair with an external recirculation pump (sold separately) to reduce the wait time for hot water to reach a fixture — useful in larger homes where the distance from the heater to a bathroom can otherwise mean a long wait. Rinnai states this unit can accommodate up to 7 appliances or fixtures running simultaneously, a specific capacity figure worth comparing directly against your household's actual simultaneous hot-water demand (multiple showers, a dishwasher, and a washing machine running at once, for example).
Warranty coverage per the listing is a tiered structure: 15 years on the heat exchanger specifically, 5 years on other parts, and 1 year on labor — professional installation is recommended, consistent with the other gas units in this comparison.
Key Listed Features
Condensing tankless design, ENERGY STAR qualified
Up to 11 GPM flow rate, supports up to 7 simultaneous fixtures/appliances (per manufacturer)
Circ-Logic technology compatible with an external recirculation pump
15-year heat exchanger / 5-year parts / 1-year labor warranty
