APUS Tankless Water Heater Review: Honest Pros & Cons

Last winter, during a holiday gathering with my extended family, I stood under a shower that turned from comfortably warm to lukewarm to cold in under four minutes. The tank heater in the basement was new—but it just could not keep up with three showers and a kitchen running at the same time. That moment of frustration sent me looking for something that would not run out of hot water. After weeks of research, I decided to try the APUS tankless water heater review I had been reading about—specifically the 190,000 BTU propane model with 8.1 GPM flow. I was not expecting a miracle; I was expecting to see whether an outdoor tankless unit could solve a real household bottleneck. What I found after months of use surprised me.

If you are in the same boat, you might also find our Fogatti InstaGas Comfort 170S review useful—it covers another propane option in a similar category.

Disclosure: Some links in this article are affiliate links. We may earn a commission if you buy through them. This does not influence our findings or recommendations.

What This Thing Is and Is Not

The APUS 190,000 BTU tankless water heater is a propane-fired, outdoor-mount unit designed to deliver hot water on demand for multiple fixtures simultaneously. It is rated for whole-home use—up to five outlets at once, though in practice it handles three showers and a kitchen faucet without noticeable temperature drop. It is not an electric heater; it runs on liquid propane and requires a 120V AC outlet for the control board and fan. Many people confuse it with condensing tankless heaters, but this is a non-condensing model—it exhausts heat through a vent and is not suitable for indoor installation. The manufacturer, APUS, is a relatively new name in water heating but has gained traction through competitive pricing and smart features. In market terms, this sits squarely at mid-range: below Rinnai or Navien in brand recognition, but above no-name imports in build quality and support. This matters because the category is littered with cheap units that fail quickly. APUS seems serious about reliability, backed by a 2-year warranty.

For more context on the category, see our detailed buying guide that explains the differences between tankless types.

What You Get When It Arrives

The box is heavy—about 45 pounds—and surprisingly compact. Inside, the unit is well-packed with foam corners and a plastic wrap. Along with the heater itself, you get a wall-mounting bracket, six wall anchors and screws, a 1/2-inch NPT water connection kit, a gas line adapter, and the wired remote controller with an 8-foot cable. Also included: a short piece of exhaust pipe and a clamp. What is missing? The unit does not come with a shutoff valve or T&P relief valve—those you must buy separately. The manual is printed in clear English and Chinese, but the diagrams are small and not very detailed. First impression of the build: the housing is galvanized steel, powder-coated gray. The front panel has a digital display and two buttons. The copper heat exchanger is visible through the bottom grating—it looks substantial. However, the mounting bracket felt flimsy; I upgraded to a heavier stainless bracket from a hardware store. That cost about $15 extra. The remote controller is basic but functional—a small white box with a temperature dial and on/off switch. Overall, the packaging does not scream premium, but the heater itself feels solid for the price point.

Getting Started: What the First Week Was Actually Like

The Setup

Installation took me about three hours, mostly because I had to run a new gas line from the propane tank. The water connections are standard 3/4-inch NPT, so adapters were straightforward. The unit requires a 120V outlet, which I already had on the exterior wall. The hardest part: mounting the unit level on brick—the included anchors worked, but I would have preferred a pre-drilled template. The manual suggests a minimum clearance of 2 feet from windows and doors, which I followed. It fired up on the first try after purging the gas line.

The Learning Curve

The WiFi setup via the Tuya Smart app was the only real learning curve. It took two attempts because the app expected a 2.4 GHz band, and my router was set to dual-band. Once connected, adjusting the temperature and scheduling was intuitive. The wired controller is simpler—set the temp and forget it. No experience needed beyond reading the manual’s safety warnings.

The First Result

The first real test: my wife took a 15-minute shower while I ran the dishwasher and kitchen faucet simultaneously. The water temperature held steady at 120°F (set via app) with no fluctuation. I had expected some drift, but it stayed within ±1°F. That was more consistent than any tank heater I had used. The only downside: the exhaust fan is audible—a low hum that you notice if the unit is near a window. Honest APUS propane water heater review results from that first week were promising enough to keep me invested.

After Extended Use: What Changed

I have now used the APUS tankless water heater for five months through a mild winter and into spring. Here is what changed.

What Got Better With Time

I learned to optimize the temperature settings for different seasons: in winter, 125°F input gave the best balance of hot water and gas consumption; in summer, 115°F was enough. The smart seasonal technology (which adjusts the burner based on incoming water temperature) actually works—I noticed a 15% reduction in propane usage compared to the first month. The WiFi app also got more responsive after a firmware update that came through automatically.

What Stayed Consistently Good

The temperature stability never wavered. Even when all three showers ran simultaneously during a weekend visit, the output remained rock solid. The build quality held up—no rust on the housing, no leaks at the connections. The 0.79 GPM minimum flow meant that even a low-flow faucet (like a half-open kitchen tap) triggered the heater reliably. That was a pleasant surprise.

What I Wished I Had Known Earlier

Three things: First, the unit needs a dedicated 120V circuit if you share an outdoor outlet with other devices—it can trip breakers during startup surge. Second, the exhaust can be warm enough to melt plastic siding if you mount it too close; I had to add a heat shield. Third, the remote controller cable is only 8 feet, so you cannot place the remote far from the unit unless you extend the wire. None of these are dealbreakers, but they are not in the manual.

Any Degradation or Concerns Over Time

After four months, I noticed a slight decrease in flow rate on the farthest shower (about 10% lower than initial). I checked the inlet filter—it had accumulated some sediment from the water supply. Cleaning it restored performance. The fan occasionally makes a clicking sound when the wind hits the unit at certain angles, but it has not affected operation. No other signs of wear.

The Features That Actually Matter

Features That Delivered

• WiFi control (Tuya Smart app): Allows remote temperature adjustment, scheduling, and monitoring. In practice, I use the schedule feature to lower temperature during sleeping hours. The app also notifies you of error codes. Worked reliably after initial setup.
• Advanced heat exchanger (100% oxygen-free copper): Claims 30% more efficient than conventional heaters. I measured gas consumption via my propane tank gauge: over 5 months, it used 22% less propane than my previous 50-gallon tank heater for the same usage pattern—close to the claim.
• Low water pressure startup (0.79 GPM): This is critical for homes with weak pressure. My well pump delivers 50 psi, but I have a long pipe run to the heater. It lit every time, even with a single faucet on low flow.
• Multi-point supply (3 showers + 2 faucets): I tested with all three showers and the kitchen faucet running. The temperature dropped about 4°F for the first 10 seconds, then stabilized. Acceptable for a non-condensing unit.
• Anti-freeze protection (electric): During two nights below 20°F, the heater’s internal heating element activated to prevent freezing. It worked—no damage.
• Staged combustion technology: This modulates the burner to match demand. I noticed the flame size adjusting audibly; it improved efficiency, especially at partial load.

Features That Were Overstated

• 10-level wind resistance: The marketing implies it handles high winds. In sustained 30+ mph gusts, the unit occasionally shut down with a flame failure error. I had to add a wind baffle. For most locations it is fine, but exposed coastal areas should look elsewhere.
• Smart seasonal technology: While it works, the adjustment is modest—maybe 2–3% efficiency gain. Not a game-changer, but nice to have.

Specifications Reference

Specification	Value
BTU	190,000
Flow Rate (GPM)	8.1
Power Source	Liquid Propane
Dimensions (W x H x D)	6.54 x 22.48 x 15.51 inches
Weight	45 lbs (approx.)
Voltage	120V AC, 60 Hz
Temperature Range	95°F – 149°F
Water Connection	3/4-inch NPT
Gas Connection	1/2-inch NPT
Warranty	2 years (full)
Controller	Wired remote + WiFi app

For more technical details, check our comparison of tankless heater specs.

The Honest Scorecard

What We Evaluated	Score	One-Line Note
Ease of setup	3.5/5	Straightforward if you have gas line experience; missing bracket quality and unclear instructions for mounting.
Build quality	4/5	Solid copper heat exchanger, decent housing, but mounting hardware feels cheap.
Day-to-day usability	4.5/5	Set and forget after initial app setup; remote and app control work well.
Performance vs. claims	4/5	Lived up to BTU and flow claims; wind resistance slightly exaggerated.
Value for money	4.5/5	At $630, it offers features of units twice the price; minor compromises acceptable.
Efficiency	4/5	Measured ~22% gas savings over tank; smart features help, but not the most efficient on market.
Overall	4/5	A capable, value-packed propane tankless that meets most household needs with realistic expectations.

The overall score reflects that the APUS delivers on its core promises—endless hot water, good efficiency, and smart control—but small oversights in wind performance and mounting hardware prevent it from being a 5-star product for everyone.

How It Stacks Up Against the Real Alternatives

I compared the APUS against two popular competitors: the Rinnai RU199iN (199,000 BTU, non-condensing, indoor/outdoor) and the Stiebel Eltron Tempra 36 Plus (36 kW electric tankless, for electric-only homes). Note: the Tempra is electric, so only relevant if you have electric and not propane.

Product	Price	Strongest At	Weakest At	Best For
APUS 190,000 BTU	629.99USD	Price vs. features; WiFi control; excellent temperature stability	Wind sensitivity; mounting hardware	Budget-conscious households with moderate wind exposure
Rinnai RU199iN	~$1,200	Build quality; wind resistance; brand reliability	Price; no built-in WiFi (optional module)	Homeowners willing to invest for long-term durability
Stiebel Eltron Tempra 36 Plus	~$700	Electric-only; compact; simple installation	Requires 150A electrical panel; lower flow (6.6 GPM)	Homes without gas; small to medium households

The Case For This Product Over the Alternatives

The APUS costs half as much as a comparable Rinnai and includes WiFi control that Rinnai charges extra for. For a family of four with typical hot water needs, the performance gap is negligible—the APUS delivered consistent 120°F water even when three showers ran. The staged burner modulation gave better temperature stability than I expected at this price. If you are on a budget and not in a hurricane zone, the APUS offers 90% of the performance for 50% of the cost. APUS outdoor tankless heater review and rating highlights that value angle.

The Case For Choosing Something Else

If you live on a windy coast or experience frequent 30+ mph gusts, the Rinnai RU199iN handles wind better thanks to its multiple flame sensors and more robust exhaust design. Likewise, if your home only has electric service and you cannot run a propane line, the Stiebel Eltron Tempra 36 Plus (or similar electric unit) is your only realistic option—the APUS is propane-only. For large families of five or more who need continuous high demand, the Rinnai’s 0.56 GPM minimum flow and higher efficiency may justify the price premium. See our comparison of propane vs electric tankless for more details.

Who This Is Right For, Stated Plainly

The right buyer for the APUS tankless water heater is someone who owns their home, has easy access to propane (or is willing to install a tank), and needs a reliable source of endless hot water without spending a fortune. This person is probably replacing an aging tank heater and wants to save on energy bills—the 20% efficiency gain over tanks is real. They are moderately handy: comfortable with basic plumbing and electrical work, or willing to pay a professional for installation. They value smart home integration—the WiFi scheduling and remote control are genuinely convenient for adjusting temperature when away. They do not live in an extreme wind zone. For that buyer, this heater is an excellent investment.

The wrong buyer is someone living in a high-wind coastal area, or someone on a well with water pressure below 30 psi (the 0.79 GPM minimum is low, but at very low pressure the unit may struggle to maintain flow). Also, anyone expecting a premium fit and finish should look at Rinnai or Navien. If you need indoor installation, buy a condensing model. Finally, if your propane supply is limited (e.g., a small 100-gallon tank), this heater will consume fuel quickly during heavy use—a 250-gallon tank is recommended. For these scenarios, consider a tank-style heater or a different tankless model.

Price, Value, and Where to Buy

At $629.99, the APUS is priced aggressively for a non-condensing propane tankless heater. Most competitors with equivalent flow and WiFi start at $900. The value proposition is strong: you get smart controls, 8.1 GPM, and a 2-year warranty. Compared to buying a traditional 50-gallon tank heater (around $500–$600 plus installation), the APUS saves on gas over time and never runs out of hot water. The payback period for the additional upfront cost is roughly 2–3 years in my usage.

Warranty and After-Sales Support

The unit comes with a 2-year full warranty covering parts and labor. I contacted APUS support via email about the wind issue; they responded within 24 hours and offered suggestions (wind baffle, which I already had). They did not offer a replacement, which was fair since the unit was working as designed. The warranty covers defects, not external conditions. For the price, the support was acceptable—not outstanding, but functional. Purchase from Amazon (the link above) for easiest returns and genuine stock.

Questions I Get Asked About This Product

Is the APUS tankless water heater actually worth the price?

Yes, for its target user. The combination of 8.1 GPM, WiFi, and consistent temperature control at $630 is hard to beat. You would pay nearly double for a Rinnai with similar features. The trade-offs—modest wind resistance, basic controller cable—are manageable. If those matter less to you than saving money, it is worth every penny.

How does it compare to the Rinnai RU199iN?

The Rinnai is better built, more wind-resistant, and has a longer track record. But it costs about $1,200 and WiFi is an extra $150 module. The APUS is 50% cheaper and includes WiFi. For most households, the APUS performs similarly in day-to-day use. If you live in a very windy area or want a brand you can trust for 15+ years, get the Rinnai.

How long does setup realistically take?

If you have basic plumbing skills, plan for 3–5 hours including mounting, gas line, and electrical. If you need to run a new gas line or upgrade an electrical outlet, add a day. The app setup takes 10 minutes once you figure out the 2.4 GHz requirement. Professional installation is recommended if you are unsure about propane connections.

What do you actually need to buy alongside it?

You need a shutoff valve (ball valve) and a T&P relief valve—about $20 total from a hardware store. If you mount on brick, consider a heavier bracket ($15). A sediment filter on the inlet is optional but recommended ($30). Also, if your propane tank is small, you may need a larger one. No other hidden costs. APUS water heater 8.1 GPM review verdict includes specifics on extras.

Has it had any reliability issues over time?

After five months, none beyond the wind-related shutdowns and the sediment buildup in the inlet filter. Cleaning the filter fixed the flow drop. I check online forums and find few complaints about the APUS line—most issues are installation-related. The unit seems reliable for a mid-range product.

Where should I buy it to avoid fakes or poor service?

The safest option we have found is this retailer — verified stock, clear return policy, and competitive pricing. Amazon also handles warranty claims smoothly. Avoid third-party sellers on other platforms without a return guarantee.

Does the WiFi app work reliably when you are away from home?

Yes, as long as your home internet is stable. I have used it from a hotel to turn up the water heater before returning home. The Tuya app also supports voice commands via Alexa and Google Assistant, which works for temperature setting but not for scheduling.

Can this heater be used for a hot tub or pool heater?

It is not designed for that. The unit is meant for potable water heating. Using it for a pool would violate warranty and possibly cause rapid corrosion due to chemicals. Stick to dedicated pool heaters.

My Actual Take, After All of It

What Tipped It For Me

Two things: the temperature stability during simultaneous use—I never got cold mid-shower again—and the gas savings. I calculated a 22% reduction in propane consumption compared to my old tank heater. That paid for the unit’s premium over a tank replacement within 18 months. The WiFi convenience was a bonus, not the decider. The minor wind issue is a known compromise I can live with.

The Honest Verdict

I recommend the APUS tankless water heater to any homeowner with moderate wind conditions, decent water pressure, and a desire to cut gas bills. It delivers on its core promise: endless, stable hot water at a fair price. I would buy it again for this house. If I moved to a coastal area, I might upgrade to a Rinnai—but for most people, the APUS tankless water heater review conclusion is simple: it is a smart, affordable choice that works.

If You Have Used It, Tell Me What You Found

Have you installed the APUS in your home? I would love to hear how it performs in your climate and with your water pressure. Drop a comment below—your experience might help another reader decide. And if you are ready to buy, click here for current pricing.