Rinnai V75iN Value Series Indoor Tankless Water Heater

The Rinnai V75iN Value Series Indoor Tankless is Rinnai's entry-tier 180,000 BTU natural gas tankless. "V" identifies the Value Series (Rinnai's budget tankless positioning below the RU Sensei and RL Luxury series). "75" reflects the 7.5 GPM rated capacity; "iN" identifies indoor mounting.

Specs: 180,000 BTU natural gas input, UEF 0.82 (non-condensing), 7.5 GPM at a 35°F rise or 3.7 GPM at a 70°F rise. Category III stainless steel B-vent venting. Copper heat exchanger. 10-year warranty on heat exchanger, 5-year on parts.

The V75iN is the cost-effective gas tankless option from Rinnai. Sits below the RL75iN Luxury Series in features (no remote controller, simpler control board) but matches it on fundamental performance specs. About $1,000 unit, $2,400 installed.

The non-condensing exhaust temperature requires stainless steel B-vent (or Category III chimney liner) rather than the PVC venting used by condensing models. In retrofits where an existing atmospheric gas tank used a B-vent chimney, the V75iN reuses much of that infrastructure — saving $500-$1,200 in venting work versus a condensing tankless retrofit.

Right buyer: budget-conscious tankless conversion in a 1-2 bath warm-climate home with existing B-vent chimney to reuse. Wrong buyer: cold-climate primary residences (winter GPM marginal), 3+ bath homes (capacity insufficient), or new construction where condensing tankless is more appropriate.