//Quick answer
- Widely installed, widely serviced, parts readily available.
- $4,000 to $6,000 installed; permit usually required.
- Condensing and non-condensing options affect venting.
- Dealer or certified-installer status: not confirmed, not claimed.
01Definition
What is Rinnai known for?
Rinnai is a Japanese manufacturer with a large installed base of residential tankless units in the United States. Its familiarity in the trade means parts and service knowledge are easy to come by, which matters years after the install when a sensor or valve needs replacing.
What does a Rinnai install involve?
The standard tankless scope: correctly sized gas supply, venting matched to the unit, isolation valves for future flushing, power for the controls, and a condensate drain on condensing models. Done-Rite does the gas, venting and condensate work and pulls the permit when required.
02When it applies
When does Rinnai fit?
Replacing an existing Rinnai, retrofits where its venting options suit the house, and households that value a widely serviced unit. Like Navien and Noritz, it is sized to the fixtures that may run at once, not to the tank it replaces.
When would the crew suggest a different brand?
When built-in recirculation is the priority or when the fit and venting favor another unit. The recommendation is about the installation; all three brands are on the truck.
03What goes wrong
What goes wrong?
The same two things as every tankless: scale from hard water without descaling, and undersizing. A $150 tune-up visit covers the flush on a unit that is already in.
04Proof
- 1 year minimum warranty on labor. Manufacturer warranty handling varies by manufacturer.
- When a job needs a permit, Done-Rite pulls it and schedules the inspection.
- 4.9 stars across 1,720+ Google reviews on the Orange profile, checked September 17, 2026.
- California CSLB C-36 licence #998069. Licensed, bonded and insured, with workers compensation.
05Action
Price a Rinnai install
$4,000 to $6,000 installed, 1 year minimum labor warranty, permit pulled when required. Financing is available with terms up to 10 years.
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Where this applies
Done-Rite runs these calls across Orange County from its shop in Anaheim, CA, with no trip charge in any city it serves.
Common questions
$4,000 to $6,000 installed.
Yes. Descaling a tankless heat exchanger is part of Done-Rite's water heater service, and the tune-up is a flat $150 per unit.
