We're Navien specialists, but we're also Rinnai PRO and Noritz certified, and we repair Rheem units every week. That means we see how all of these brands age in real San Jose homes — not just how they look in a brochure.
Open 24/7 · CSLB #1008381 · Joseph J. Castro, Owner · contact@efficientwaterheaterssanjose.com
Navien leads on built-in recirculation and condensing efficiency (up to .96 UEF on the NPE-2 series, with a pump and buffer tank inside the NPE-A2). Rinnai has an excellent reliability record and the widest independent service network. Rheem is the value option and is easy to source locally. For most San Jose homes wanting fast hot water without adding a separate pump, the Navien NPE-A2 is the strongest all-around choice. Efficient Water Heaters, Inc. services all three — (408) 470-0191.
Navien's NPE-A2 puts a recirculation pump and a small buffer tank inside the cabinet. That solves the two complaints homeowners actually have about tankless — the wait for hot water and the cold-water sandwich — without hanging extra hardware on the wall. The dual stainless heat exchangers are a genuine durability advantage in hard water, and NaviLink gives you real remote control and diagnostics. Efficiency at the top of the range is up to .96 UEF.
Rinnai's reputation for boring, dependable operation is earned. Parts are easy to get, almost any competent plumber can service one, and the controls are straightforward. If you don't need recirculation built in and value the largest possible pool of service techs, Rinnai is a fine choice. We're Rinnai PRO certified and install them when they're the right call.
Rheem is widely stocked, competitively priced, and adequate for a straightforward replacement where budget is the deciding factor. Its condensing models are solid; the non-condensing ones give up efficiency. In our service data, Rheem tankless units tend to be less forgiving of hard water and marginal gas supply than Navien or Rinnai.
After nearly three decades of water heater work, here's the uncomfortable truth: the installation matters more than the badge. A Navien on an undersized gas line will disappoint you. A Rheem installed with correct gas, correct venting, isolation valves, and an annual flush will quietly outlive its warranty. Pick the brand that fits your needs, then pick the installer who will size the gas line properly and pull the permit.
| Factor | Navien | Rinnai | Rheem |
|---|---|---|---|
| Peak efficiency | Up to .96 UEF (NPE-2 condensing) | High on condensing models | Good on condensing, lower on non-condensing |
| Built-in recirculation | Yes — pump + buffer tank in the NPE-A2 | External pump or dedicated model | Select models only |
| Heat exchanger | Dual stainless steel | Copper (commonly) | Stainless on condensing |
| Smart controls | NaviLink Wi-Fi | Control-R app module | EcoNet on select models |
| Hard-water tolerance | Strong when descaled annually | Strong | Moderate |
| Local parts availability | Good — we stock common parts | Excellent | Excellent |
| Best for | Fast hot water, high efficiency, whole-home comfort | Simple, dependable, easy to service anywhere | Budget-conscious straight replacements |
“Had a great experience with the guys at Efficient Water Heaters. Joseph and his employee came out right on time, got to work with no fuss, and a little more than three or four hours later we had a brand new tankless installed in our house. They even swept up the garage cleaner than it was before they got there. Great communication before, during, and afterwards. Would definitely recommend them.”
“I asked a lot of questions about tankless. Joseph was quick in responding and the answers were unbiased and helpful. Marco helped us install the water heater. He is efficient, professional, and the job was very well done. Price is fair — I got the best quote comparing with 2 other vendors who have good reviews on Yelp. Highly recommend.”
“We were in a bind. Had no water and couldn't get ahold of anyone on the weekend. Joseph responded immediately. Scheduled an appointment the next day and gave us a beautiful new tankless hot water heater for the same price as the previous person quoted for a 40-gallon. His work was very nicely done and we are very happy with our new efficient water heater.”
Call (408) 470-0191 for the fastest answer — we're open 24 hours a day, 7 days a week — or send the form and we'll get right back to you.
Efficient Water Heaters, Inc. · Joseph J. Castro, Owner · CSLB #1008381 · (408) 470-0191 · Navien tankless service in San Jose
Follow the links below for the same work in your city, the Navien fault codes tied to it, and the services homeowners usually book alongside it.
