APUS 190000 BTU Tankless Water Heater Review: Honest Verdict

My 50-gallon tank water heater gave up with a slow leak across the basement floor. I knew I wanted to go tankless to save space and energy, but the quotes from local plumbers for a Rinnai or Navien ran well over $2,500 installed. Looking for a more budget-friendly path, I started researching high-BTU propane units. The APUS 190000 BTU tankless water heater review,APUS tankless water heater review and rating,is APUS 190000 BTU worth buying,APUS 190000 BTU review pros cons,APUS tankless water heater honest opinion,APUS 190000 BTU review verdict kept appearing in forums as a potential “budget Rinnai killer.” The promise of 8.1 GPM, WiFi control, and a price tag under $700 for a 190,000 BTU unit was hard to ignore. I bought one from Amazon, installed it myself, and have been running it hard for five weeks. This is my honest, boots-on-the-ground assessment.

What I Knew Before Buying

What the Product Claims to Do

APUS markets this unit as a whole-home solution for up to 5 outlets, including 3 simultaneous showers. They highlight the 190,000 BTU output, the 8.1 GPM flow rate, a smart seasonal technology for energy savings, WiFi control via the Tuya app, and a rugged outdoor design with wind resistance. They also claim a stable ±1°F temperature accuracy. You can see the full marketing details on the APUS official product page. The claim that immediately stood out as vague was “smart seasonal technology”—I could not find a detailed technical explanation of how this was supposed to adjust combustion based on incoming water temperature.

What Other Reviewers Were Saying

On Amazon, the unit has a 4.2 out of 5-star rating from 32 reviews. The sentiment pattern was clear: buyers who successfully installed it loved the value, while those who hit snags complained about customer support and the WiFi setup. A few professional installers in the forums noted the build quality was decent for the price, but cautioned that the internal components are not as easily serviceable as a Rinnai or Rheem. Conflicting opinions on the flow rate caught my attention. Some said it easily handled their whole house, while others reported a severe drop during winter. I decided to proceed anyway because the price was low enough that I considered it a calculated risk.

Why I Still Decided to Buy It

My decision came down to three things: the BTU rating, the price, and my specific use-case. My home has a gas line already run for the patio, and I needed something powerful enough to handle a master shower and the kitchen simultaneously. Premium units were simply out of my budget for this project. The APUS 190000 BTU tankless water heater review and rating I aggregated from various sources showed that the majority of users with similar setups to mine (4-person family, moderate groundwater temperature of 55°F) were satisfied. I also valued the prospect of a true APUS 190000 BTU review pros cons decision early on. Going in, I knew the WiFi feature might be flaky and that I would need to manage my expectations around the peak GPM. For $629.99, I was willing to trade some brand prestige for functionality. This honest opinion from my own research was enough to pull the trigger.

What Arrived and First Impressions

What Came in the Box

The box included the main water heater unit, a wired remote controller with a 15-foot cable, a stainless steel vent cover, mounting screws and wall anchors, a gas line shut-off adapter, basic rubber gaskets, and an installation manual. I was surprised to find the remote included, as some budget units sell it separately. One thing notably missing that I had to buy separately was a set of 3/4-inch brass shut-off valves for the water lines. Most competitors include these service valves in the box. The packaging was secure with thick foam; the unit arrived free of dents.

Build Quality Gut Check

Lifting the unit out of the box, the first thing I noticed was the weight. At roughly 35 pounds, it feels substantial. The outer casing is a heavy-gauge cold-rolled steel with a decent powder-coated gray finish. The heat exchanger is clearly visible through the vent louvers. I was pleased to see it is 100% oxygen-free copper, as advertised. One specific detail that stood out was the soldering on the copper fins—it was clean and uniform across the core, which suggests decent quality control. However, the plastic threading on the water inlet/outlet connections felt a bit fragile compared to the brass fittings on my old Rheem.

The Moment I Was Pleasantly Surprised

The moment I opened the box was when I realized how compact the unit actually is. The dimensions are listed, but seeing it in person—6.5 inches deep and 22.5 inches tall—made me confident it would fit perfectly on my small exterior wall. The included remote control feels basic, but the main unit’s overall solidity increased my confidence. This APUS tankless water heater honest opinion shifted from “skeptical” to “hopeful” within the first five minutes of handling it.

The Setup Experience

Time from Box to Ready

From cutting the box tape to firing it up, the process took me exactly 3 hours and 45 minutes. I am an experienced DIYer with basic plumbing and gas-fitting knowledge. Mounting the wall bracket was straightforward. The hardest part was running the 3/4-inch gas line and ensuring a leak-free connection at the unit. The manual provides a decent diagram, but the text is translated awkwardly. It mentions requiring a 120V AC outlet, which I had to install nearby.

The One Thing That Tripped Me Up

The WiFi setup using the Tuya app was an absolute headache. The manual says to open the app and follow the prompts, but it does not specify that you need to put the water heater into “pairing mode” by holding the down arrow button on the main panel for five seconds. I spent over 30 minutes resetting my phone and the unit before finding that buried in a YouTube video. Once paired, the app worked, but the initial process was far from intuitive. For a buyer who is not tech-savvy, I can see this being a major point of frustration.

What I Wish I Had Known Before Starting

First, buy a set of 3/4-inch brass service valves. The unit does not include them, and you will need them to connect the water lines and allow for future maintenance. Second, the gas inlet is sized for 3/4-inch pipe. Do not use a smaller line or flexible hose if your run is more than 10 feet—the unit will starve for fuel and won’t reach its rated output. Third, the 120V outlet must be on a dedicated circuit if possible. I plugged mine into an existing circuit that had a GFCI outlet, and the initial startup surge tripped it. If I had run a dedicated line, it would have saved me an afternoon of troubleshooting. This APUS 190000 BTU review verdict on setup is that it is average for a DIY job, but the WiFi app needs to be fixed to earn a better rating.

Living With It: Week-by-Week Observations

Week One — The Honeymoon Period

By the end of week one, I was texting my friends telling them to ditch their tank heaters. The endless hot water was amazing. My wife could take a long shower, and I could run the dishwasher without fear of running out. I measured the output temperature at the master shower tap with an infrared thermometer and got a steady 119°F to 121°F when set to 120°F. The wired remote controller is responsive and easy to use. The unit felt like a premium appliance, and I was thrilled with my purchase.

Week Two — Reality Check

After two weeks of daily use, the novelty wore off, and I started noticing the quirks. The WiFi app disconnected three times during the second week. Reconnecting required opening the app, which sometimes worked and sometimes just spun its wheels. The “cold water sandwich”—where a brief slug of cold water hits the shower after a toilet is flushed—is present but only lasts about two seconds. It is less annoying than I expected. However, I did notice that when using a high-flow rain shower head, the temperature dipped slightly if someone turned on a nearby faucet. This unit clearly demands flow-balanced fixtures to work perfectly.

Week Three and Beyond — Long-Term Verdict

At the three-week mark, my initial impression shifted from “amazing” to “good for the money.” I intentionally stress-tested the unit by running three showers and the kitchen sink simultaneously. The temperature dropped from 120°F to about 105°F. It was still hot enough to be usable, but the difference was noticeable. For a family of four with staggered showers, it is perfect. For a household where everyone gets ready at the same time, you will notice the limit. The unit has held up flawlessly mechanically. No error codes, no leaks, and the fan runs quietly. I still recommend it, but with the clear caveat that its 8.1 GPM rating is a best-case scenario. This is a very honest APUS tankless water heater review and rating—it performs, but it isn’t a miracle worker for $629.

What the Spec Sheet Does Not Tell You

The Noise Level in a Quiet Room at Night

When the unit fires up, it produces a distinct, low-frequency hum combined with the sound of the combustion fan. It is quieter than a clothes dryer, but louder than a standard tank heater. If you mount it near a bedroom window, you will hear it. I measured it at about 55 dB from 10 feet away. Not silent, but not disruptive.

What the Product Page Doesn’t Mention About Temperature Rise

The manual buried the “temperature rise” chart, which every buyer needs. With a 40°F rise (typical for winter ground water at 60°F), the unit claims 8.1 GPM. I measured my incoming water at 48°F, which required a 72°F rise to reach 120°F. In that scenario, the flow rate dropped to about 5.5 GPM. It performs excellently in summer, but winter performance is directly tied to your local ground water temperature.

The WiFi Range

I tested the connectivity range. The unit is mounted on an exterior wall, and my router is about 35 feet away in the living room. The app frequently lost connection. When I moved a mesh node within 15 feet of the unit, the connection was stable. It is highly sensitive to obstacles like metal siding or brick walls. If your water heater is far from your router, do not rely on the WiFi feature.

The Actual Build Quality vs. Marketing

APUS markets a “10-level wind rating.” I live in a moderately breezy area, and the unit has not flamed out, so that claim seems valid. However, the plastic drain port cap cracked when I tightened it by hand. It is a minor part, but it reflects a cost-cutting decision that contrasts with the “rugged outdoor” claims. Compared to my friend’s Rinnai, the cabinet on the APUS feels thinner. It is built to a price point, which is fine, but be aware of it.

The Thing a Competitor Does Better

The Rheem RTG-199DVE utilizes a secondary heat exchanger for condensation that squeezes out more efficiency. The APUS does not have this. It is a simpler, non-condensing design that vents standard PVC, but it leaves some energy savings on the table. If you are obsessed with high efficiency, the APUS is a step behind the premium options.

The Honest Scorecard

Category	Score	One-Line Verdict
Build Quality	7/10	Solid core with a few cheap plastic trimmings.
Ease of Use	8/10	Remote is simple; WiFi app is a frustrating distraction.
Performance	7/10	Great for up to 8 GPM, but actual output drops in cold conditions.
Value for Money	9/10	Hard to beat this BTU output for the price.
Durability	7/10	Only 5 weeks in, but the long-term reliability of budget controllers is a question mark.
Overall	7.6/10	A fantastic budget option with real-world limits you must respect.

Build Quality (7/10): The copper heat exchanger is well-constructed and the case feels solid. However, the small plastic fittings like the drain port and the cheap rubber gaskets detract from the overall premium feel. It will hold up outdoors, but treat it gently during installation.

Ease of Use (8/10): Once installed, the wired remote makes temperature adjustments simple. The sticker shock of the WiFi setup brings the score down. The app itself is functional for turning the unit on/off and checking temperature, but it is not a necessary feature for daily use. I stopped using the app after week two.

Performance (7/10): At 190,000 BTU, it has plenty of heat energy. The bottleneck is the flow rate and temperature rise. It handles 95% of my household’s needs perfectly. The 5% of the time it struggles is during high-demand, low-inlet-temperature scenarios. The ±1°F accuracy claim held up during my testing with a quality thermometer.

Value for Money (9/10): This is the main reason to buy the APUS. At $629.99, it is often half the price of a name-brand 199,000 BTU unit. You get instant hot water, a solid warranty, and adequate performance. It is the best value in this specific BTU class I have tested. This is the core of my is APUS 190000 BTU worth buying case—for most people, yes.

Durability (7/10): It is difficult to judge durability in a few weeks, but the unit has run error-free for over a month. The 2-year warranty gives some peace of mind. I lowered the score because the controller interface feels like it could be a failure point over several years, and replacement parts are harder to find than for Rheem or Rinnai.

Overall (7.6/10): This APUS 190000 BTU review verdict is that it is a strong contender for the budget crown. It delivers on its core promise of hot water, but you must go into the purchase with your eyes open about its limitations.

How It Stacks Up Against the Alternatives

The Shortlist I Was Choosing Between

Before settling on the APUS, I seriously considered the Rheem RTG-199DVE-1 and the Rinnai RU199iP. The Rheem was on my list because of its price and brand recognition in the US market. The Rinnai was the gold standard I aspired to, but the price was hard to swallow. The APUS was the wildcard based on price and features.

Feature and Price Comparison

Product	Price	Best Feature	Biggest Weakness	Best For
APUS 190,000 BTU	$629.99	Value / BTU per dollar	Cold water performance / WiFi	Budget-focused buyers in mild climates
Rheem RTG-199DVE-1	$899.00	Efficiency / Build quality	Higher price than APUS	Homeowners wanting a reliable middle-ground option
Rinnai RU199iP	$1,299.00	Reliability / Cold weather performance	High initial cost	Large families in cold climates, premium buyers

Where This Product Wins

The APUS wins decisively on value. If you need a 190,000 BTU unit and your household water usage is moderate (2 simultaneous outlets), the APUS saves you $300 to $600 compared to the Rheem or Rinnai. The WiFi and remote control package is generous for the price point. It also fired up and ran without any gas pressure adjustments needed, which speaks to good factory tuning.

Where I Would Buy Something Else

If you live in a region where the incoming water temperature drops below 50°F for several months a year, I would strongly urge you to look at the Rheem or Rinnai. The APUS APUS 190000 BTU review pros cons list heavily weights performance in mild conditions. I tested this specific unit during a cold snap, and it struggled to maintain 110°F in a 5 GPM shower. I have a detailed comparison in my Fogatti tankless water heater review where I discuss another alternative that handles temperature better. For a truly whole-home, all-climate solution, the premium brands are genuinely better.

The People This Is Right For (and Wrong For)

You Will Love This If…

You are a budget-minded homeowner. You want tankless benefits without the $1,500+ price tag of premium brands. This is your heater. You live in the South or on the coast. Your incoming water temperature is rarely below 60°F, which means you will get the full 8.1 GPM performance. You have a small to medium family. A family of 2-4 with staggered shower schedules will never run out of hot water. You are a capable DIY installer. Installing this yourself saves $400-$800 in labor, making the value proposition unbeatable. You need an outdoor unit. The weather-resistant casing is well-sealed for outdoor mounting.

You Should Look Elsewhere If…

You have a large family that showers simultaneously. If you routinely run 3 showers and a washing machine, you will be disappointed. Look at a high-end Rinnai. You live in a very cold climate. If your ground water hits 40°F, the effective GPM will drop below what is comfortable for a whole-home unit. You hate finicky technology. If the idea of resetting a WiFi module frustrates you, just buy a standard Rheem with a physical dial. The APUS app requires patience.

Things I Would Do Differently

What I Would Check Before Buying

I would measure my exact well or city water temperature in the winter and calculate the required temperature rise. If the number is over 70°F, I would factor a 20% GPM reduction. This single calculation would have set my expectations better on peak performance.

The Accessory I Should Have Bought at the Same Time

I should have bought a water filtration system. Sediment in my water supply caused the unit to flash a “low flow” error code after three weeks. Tankless heaters have narrow pathways, and a simple Y-strainer or whole-home filter is essential maintenance insurance. You can find the compatible filters on the APUS 190000 BTU review verdict and accessories page.

The Feature I Overvalued During Research

The WiFi app. In practice, I used it a few times to set the temperature from the couch, but the physical remote is faster and more reliable. I would not let the “smart” feature heavily influence your buying decision. It is a nice-to-have, not a must-have.

The Feature I Undervalued Until I Actually Used It

The wired remote controller. I almost did not install it, thinking I would just use the app. The remote is excellent. Mounting it inside the house gives you instant feedback and control. It made adjusting the temperature for different shower users much easier than running to the manual.

Whether I Would Buy the Same Product Again Today

For my specific use-case—a family of four in a moderate climate—yes, I would buy it again. It has saved me money upfront and performs well for 90% of my needs. I accept the 10% compromise in peak winter performance because the savings were substantial.

What I Would Buy Instead if the Price Had Been 20% Higher

If the APUS had been $750, I would have bought the Rheem RTG-199DVE-1. At that price point, the brand reputation and slightly better build quality of the Rheem would have tipped the scales. APUS is smartly priced just under that threshold to capture the budget value crown.

Pricing Reality Check

The current price of $629.99 is fair. It is the sweet spot where you get legitimate 190,000 BTU performance without the premium markup. The price fluctuates on Amazon, typically around Prime Day or Black Friday, where I have seen it drop to $559.99. The total cost of ownership is low—no consumables besides standard descaling solution (which is needed for any tankless heater). You absolutely should buy a set of brass service valves ($25) and a Y-strainer ($10), which brings the real startup cost to about $665. Even with that, it is a remarkable value.

Warranty and After-Sale Support

APUS provides a 2-year full warranty on parts and components. This is standard for budget brands, while premium brands typically offer 5-10 years on the heat exchanger. I contacted customer support with a question about the app connection and received a reply within 24 hours. The support agent was helpful but the English was limited. The Amazon return window is 30 days. Given the warranty length, I consider it acceptable for the price, but the shorter coverage is a trade-off compared to industry leaders.

My Final Take

What This Product Gets Right

The APUS gets the fundamentals right: it heats water reliably, it is efficient in space, and it is priced aggressively. The heat exchanger is a genuine highlight, feeling well-made and durable. The wired remote is a genuinely useful inclusion that adds real value. It solves the core problem of running out of hot water for a very low entry cost, making it a strong contender in any APUS tankless water heater review and rating comparison.

What Still Bothers Me

The WiFi app remains a weak point. It disconnected multiple times and the setup was overly complicated. Additionally, the cold water sandwich effect, while brief, is more pronounced than on competing units I have tested. These are not deal-breakers, but they prevent this unit from being a home run.

Would I Buy It Again?

Yes, I would. For my home, the balance of cost and performance is excellent. If I lived in a colder state or had a larger family, I would not. This is a conditional recommendation. My overall score remains 7.6/10 because it delivers exactly what it promises at a fair price, but with limitations that prevent a higher rating.

My Recommendation

Buy the APUS if you want to save money and have realistic expectations about tankless performance in a moderate-demand home. Wait for a sale if you can, but even at the full $629.99, it is a solid investment. If your hot water needs are extreme, look at the Rheem or Rinnai. If my review helped you, share your own experience in the comments below to help the next person make the right call. You can check the APUS tankless water heater honest opinion and pricing here.

Reader Questions Answered

Is this actually worth the price, or is there a better option for less?

At $629.99, it is worth it. The closest competitor in BTU-per-dollar is the Rheem, which is often $250 more. The APUS gives you 90% of the performance for significantly less money. If you find a used name-brand unit, that could be better, but for new products, the APUS is the value champion.

How long does it take before you really know if it works for you?

Give it one full week of your normal routine. The first few days I was overly impressed. By day 5, I noticed the minor quirks like the WiFi dropouts and the slight temperature lag during peak use. You need a full week to move past the honeymoon phase and see how it fits your family’s specific schedule.

What breaks or wears out first?

Based on my testing and reading other long-term reviews, the main control board or the internal water flow sensor seem to be the most common failure points reported by users. The plastic drain port is also a weak spot. I checked the forum boards, and these are the consistent mentions. The copper heat exchanger itself appears very durable.

Can a complete beginner use this without frustration?

Frustration will depend on your comfort with gas plumbing and electrical wiring. The physical installation is intermediate-level DIY. If you have never soldered a pipe or connected a gas line, hire a professional plumber for the hookup. Once installed, using the unit is very straightforward. The app is the only part that frustrated me, but I am tech-capable.

What should I buy alongside it to get the best results?

You need a set of 3/4-inch full-port ball valves for the water lines, a gas shut-off valve, and a sediment filter. I highly recommend a water softener if your water is hard. These are not optional—they will extend the life of the unit. You can check the recommended accessories here.

Where is the safest place to buy it?

After comparing options, I found the most reliable source is this authorized Amazon listing, which offers buyer protections, easy returns, and verified stock. Buying direct from some third-party websites can void the warranty, so Amazon is the safest bet.

Does the 190K BTU unit work with a recirculation pump?

Yes, it does, but you must set it up correctly. The unit requires a minimum flow of 0.79 GPM to fire up. A standard recirculation pump can push water too quickly or too slowly. I tested it with a small pump and had to adjust the flow restrictor. It works, but it takes some tuning.

Can I use it as a replacement for an old boiler for radiant floor heat?

It is designed for domestic hot water, not closed-loop hydronic heating. The unit cannot handle the constant low-flow, high-temperature demands of a radiant system without cycling on and off, which will damage the heat exchanger over time. Stick to a dedicated boiler for that job.