Rinnai, Navien and Rheem tankless
Rinnai Tankless Water Heater San Antonio
Comparing tankless brands? An experienced local installer can help you pick the right model and install it correctly.
Call (726) 268-4856- Rinnai, Navien and Rheem
- Indoor and outdoor models
- No obligation to hire
Last updated November 8, 2026
Rinnai
Rinnai Tankless Water Heater Installation
At a glance
- Rinnai, Navien and Rheem are the most common tankless brands installed in San Antonio.
- All three make condensing and non-condensing gas units; Rheem also makes electric tankless.
- Correct sizing and installation matter more than the brand.
- Call (726) 268-4856 to be connected with an independent installer.
A Rinnai tankless water heater is one of the most common on-demand units in San Antonio homes. Rinnai makes indoor and outdoor gas models, including condensing units with PVC venting and models with built-in recirculation.
A Rinnai on demand water heater is sized the same way as any tankless unit: by GPM at your winter temperature rise. Installers check gas line size, venting and condensate before recommending a model.
We are an independent referral service and are not affiliated with Rinnai, Navien, Rheem or any manufacturer.
Navien
Navien Tankless Water Heater
A Navien tankless water heater is a condensing gas unit known for PVC venting and optional built-in recirculation pumps with a small buffer tank. That can reduce wait times and the cold-water sandwich effect.
Navien units are common in conversions where running stainless venting would be difficult.
Rheem
Rheem Tankless Water Heater
A Rheem tankless water heater comes in gas and electric versions, and parts are widely stocked by local suppliers. Rheem's electric line is covered on the electric tankless page.
Compare
Which Tankless Brand Fits Your Home?
The three brands overlap a lot. This table shows where each is commonly chosen.
| Brand | Fuel | Common strengths | Good fit |
|---|---|---|---|
| Rinnai | Natural gas, propane | Wide model range, indoor and outdoor | Outdoor installs and replacements of existing Rinnai units |
| Navien | Natural gas, propane | Condensing, PVC venting, built-in recirculation | Conversions and long pipe runs |
| Rheem | Gas and electric | Parts availability, electric options | Homes without gas, budget-focused installs |
Check current product details and recommended maintenance on each manufacturer's website, since they change by model.
Picked a tankless brand? Talk to a local installer.
Call (726) 268-4856Homeowner questions
Tankless Brand FAQs
Is Rinnai or Navien better?
Both are well-regarded. Navien is known for PVC venting and built-in recirculation; Rinnai for a wide range of indoor and outdoor models. Installer experience and correct sizing matter more.
Can any plumber install a Rinnai tankless water heater?
A licensed plumber can, but installers familiar with the brand know its venting, gas and setup requirements. Ask about their experience with your brand.
Are you affiliated with Rinnai, Navien or Rheem?
No. We are an independent referral service and are not affiliated with any manufacturer.
Do these brands need yearly descaling?
Yes. In San Antonio's hard water, all tankless brands benefit from descaling about once a year.
Get Connected With a Tankless Installer
Tell us which brand you are considering. We will connect you with an independent local installer who works on it. No obligation to hire.