Rinnai

Rinnai tankless water heaters deliver endless hot water with compact, efficient designs. Build the right system with indoor or outdoor models in natural gas or propane, condensing or non-condensing, recirculation options, clean venting, and the install parts to finish the job.

Shop by category

• Condensing (SENSEI series): high-efficiency indoor/outdoor units; concentric or 2-pipe venting
• Non-condensing: value models for simple replacements and mild climates
• Recirculation: built-in pump models, recirc-ready units, crossover/bypass kits, timers and controls
• Venting & covers: concentric and twin-pipe kits, terminations, pipe covers, wall thimbles
• Controls: wall remotes and optional Wi-Fi/app modules
• Install & service parts: isolation/flush valve kits, filters, condensate neutralizers, NG/LP conversion kits, repair parts

Quick choosing guide

1. Size by demand: total peak fixtures and calculate GPM at your winter temperature rise; select a unit that meets that flow on the spec curve.
2. Pick location & fuel: indoor with a vent route or outdoor where climate allows; choose natural gas or propane and confirm gas line capacity.
3. Efficiency: choose condensing for higher efficiency (plan a condensate drain/neutralizer) or non-condensing for straightforward replacements.
4. Faster hot water: pick a built-in recirc model or add a recirc kit to a recirc-ready unit; set schedules to reduce wait time.
5. Venting: select concentric or 2-pipe per the manual; follow clearances and use approved materials and terminations.
6. Complete the kit: install isolation/flush valves, pipe cover if desired, controller/Wi-Fi, sediment filter, and proper electrical/gas shutoff.