APUS 190000 BTU Water Heater Review: Honest Pros & Cons

Introduction

If your household runs multiple showers, faucets, or appliances at once, you know the frustration of running out of hot water mid-rinse. Traditional tank heaters can only store so much, and when demand spikes, you’re left waiting for the tank to refill and reheat. That’s where a powerful, on-demand system like the APUS 190,000 BTU Outdoor Tankless Water Heater comes into play.

This unit promises whole-home hot water with an 8.1 GPM flow rate, support for up to five outlets simultaneously, and the convenience of app-based temperature control. In this APUS 190000 BTU water heater review, we’ll break down the specs, features, and real-world considerations to help you decide if this propane instant heater fits your needs.

Whether you’re upgrading an aging tank heater or installing a new system in a remodel, this review covers what you should know before buying. We’ll look at the claimed performance, smart features, build quality, and where the APUS water heater stands against competitors.

For a closer look at the product, check out the APUS 190,000 BTU Tankless Water Heater on Amazon.

What Is the APUS 190,000 BTU Outdoor Tankless Water Heater?

The APUS 190,000 BTU Outdoor Tankless Water Heater (model AP-AWH-W26LPG) is a propane-powered, wall-mounted unit designed to provide continuous hot water on demand. Unlike conventional storage tank heaters that keep a reservoir of water hot 24/7, this tankless system heats water only when a tap is opened, which can reduce standby energy loss.

With a maximum output of 190,000 BTUs and a flow rate of 8.1 gallons per minute (GPM), the manufacturer states it can supply up to three showers plus two faucets simultaneously. The unit is intended for outdoor installation only, features a compact footprint (22.48 × 15.51 × 6.54 inches), and includes a Wi-Fi module that works with the Tuya smart home app, plus a wired remote controller.

This water heater is targeted at homeowners with propane gas connections who need a high-capacity, space-saving solution for whole-home hot water. It is also suitable for vacation properties, small commercial applications, or anyone looking to eliminate the limitations of a tank heater.

Key Features & Specifications

The APUS 190,000 BTU water heater packs several notable features. Below is a balanced look at what the manufacturer highlights.

Feature	Details
Power Source	Liquid Propane (Natural Gas version also available)
Heat Output	190,000 BTU
Flow Rate	8.1 GPM (gallons per minute)
Minimum Flow to Activate	0.79 GPM (ultra-low)
Temperature Range	95°F – 149°F (adjustable via app or remote)
Temperature Stability	±1°F
Heat Exchanger Material	100% oxygen-free copper (claimed 30% more efficient than conventional)
Combustion Technology	Intelligent staged combustion for up to 20% energy savings
Smart Control	Wi-Fi (Tuya app) + wired remote controller
Weather Resistance	Wind-resistant design (10-level rating), electric anti-freeze protection
Safety Features	Freeze protection, overheat protection, flame failure safeguard
Electrical Requirements	120V AC (standard outlet)
Connections	3/4″ NPT water in/out, 3/4″ NPT gas line
Dimensions (W x H x D)	6.54 x 22.48 x 15.51 inches
Weight (approx.)	Not officially listed; estimate ~50–60 lbs
Warranty	2-year full warranty on all components
Certification / Compliance	Not specified (check local codes)

One standout claim is the ultra-low 0.79 GPM minimum activation flow. This means the heater can kick on even with low water pressure, which is helpful for older homes or well water systems. The staged combustion technology is advertised to adjust burner output based on demand, which could improve efficiency during partial loads.

However, it’s important to note that actual performance depends on incoming water temperature, gas supply pressure, and installation quality. BTU ratings and GPM figures are theoretical maximums under ideal conditions.

What’s Included in the Box

According to the manufacturer, the APUS water heater ships with the following components:

• APUS tankless water heater unit (propane, 8.1 GPM, 190,000 BTU)
• Wired remote controller (with cable)
• Installation and owner’s manual
• Mounting bracket and hardware (expandable screw, wall anchors, mounting screws)
• Closed circuit terminals (for electrical connection)

Note that the gas line, water supply lines, venting materials (if required), and gas shut-off valve are not included. You will need to purchase these separately or use existing connections. The unit is designed for outdoor installation; indoor installation is not recommended by the manufacturer due to venting requirements.

Unboxing reveals a compact, well-packaged unit with a metal casing and the controller separated. The manual provides basic setup instructions, but professional installation is strongly advised for gas and compliance reasons.

How to Use

Setup and Installation

Installation of a gas tankless water heater should be performed by a licensed professional, especially when connecting to propane or natural gas lines. The APUS unit requires a 120V AC electrical outlet nearby for the control board and anti-freeze protection. The water and gas connections are standard 3/4-inch NPT.

Because this model is for outdoor use only, you will mount it on an exterior wall, following local building codes regarding clearances and venting. The unit includes a mounting bracket and screws, but you may need additional anchors for masonry walls. Ensure the location is protected from direct rain and debris; the wind-resistant design helps, but the manual likely recommends a semi-enclosed area like under an eave.

Operation

Once installed, operating the APUS heater is straightforward. Turn on the gas supply and power, then open a hot water tap. The flow sensor triggers the burner, and hot water begins to flow within seconds. The temperature can be set using the wired remote controller (mounted indoors) or via the Tuya smart app on your smartphone.

The app allows you to adjust the target temperature, monitor usage, and even set schedules. According to user reports, the Wi-Fi connection is generally reliable, though some users experience occasional disconnections that require re-pairing.

To adjust temperature: press the up/down buttons on the remote or use the slider in the app. The unit will maintain the set temperature within ±1°F under steady flow conditions.

Maintenance

Routine maintenance helps prolong the life of the unit. The manufacturer recommends:

• Periodically check for gas leaks using soapy water on connections.
• Clean the inlet water filter (usually located at the water inlet) to prevent debris buildup.
• Inspect the burner and heat exchanger annually for soot or corrosion.
• If the unit is exposed to freezing temperatures, the electric anti-freeze protection will activate as long as power is supplied. However, if power fails, you should drain the unit to prevent freeze damage.

Descaling may be needed over time if you have hard water; follow the manual for vinegar flushing procedures.

Troubleshooting

Common issues reported by users include:

• No ignition: Check gas supply, ensure the gas valve is open, and verify that the electrical outlet is live. The unit may also have a flame failure lockout that needs resetting.
• Fluctuating water temperature: This can occur if the water flow rate changes (e.g., another tap opened) or if the gas pressure is unstable. Ensure the unit is sized correctly for your peak demand.
• App connectivity issues: The Tuya app requires a 2.4 GHz Wi-Fi network. Move your router closer or use a Wi-Fi extender if needed.
• Error codes: The remote controller displays codes; refer to the manual for specific meanings. Common codes relate to flame loss, overheating, or sensor faults.

If problems persist, contact APUS customer support under the 2-year warranty.

Performance & User Experience

Without personal testing, we evaluate this product based on manufacturer claims, user reviews (42 ratings with 4.3 out of 5 stars at time of writing), and technical specifications.

The APUS 190,000 BTU unit is designed for simultaneous multi-outlet use. In theory, an 8.1 GPM flow rate at a 77°F temperature rise (e.g., from 50°F incoming to 127°F output) is achievable. For colder climates with lower incoming water temperatures, the actual GPM will drop. Users have noted that the heater keeps up well for two showers running at once, but three simultaneous showers may push the limits, especially in winter.

The intelligent staged combustion is a key feature; it modulates the burner output to match demand, preventing overheating during low flow (like a single sink) and saving energy. The oxygen-free copper heat exchanger is claimed to be more efficient than standard copper or stainless steel, but its long-term durability is not yet proven over many years of use.

Smart app control is a plus for those who like to pre-heat water or monitor usage. However, the app’s reliability varies. Some users report occasional lag or loss of connection, which is common with many smart home devices.

Wind resistance up to level 10 is an impressive claim; if accurate, it makes the unit suitable for exposed coastal or high-wind areas. Electric anti-freeze protection works down to a certain temperature, but the manual likely advises draining if power is lost during freezing conditions.

Overall, user feedback suggests that for the price point, the APUS offers good value, especially for those needing a propane solution. However, some report that customer service response times could be faster, and the included manual could be more detailed.

Pros and Cons

Pros

• High BTU output (190,000) and flow rate (8.1 GPM): suitable for whole-home simultaneous use under moderate conditions.
• Ultra-low activation flow (0.79 GPM): works well with low water pressure systems.
• Smart features: Wi-Fi control via Tuya app and wired remote offer convenient temperature adjustments.
• Compact, weather-resistant design: saves indoor space and includes wind resistance and anti-freeze.
• Energy-saving staged combustion: adjusts output to demand, potentially reducing gas consumption compared to full-power-only units.
• Long warranty: 2-year full warranty on all components provides peace of mind.

Cons

• Outdoor installation only: not suitable for indoor use unless properly vented (not designed for that by manufacturer).
• No built-in circulation pump: for instant hot water at distant taps, you would need an external recirculation system.
• App reliability: Wi-Fi connectivity can be inconsistent; remote controller works fine, but smart features may not be critical for everyone.
• Gas conversion not mentioned: unit is fixed for propane; natural gas conversion may not be available or straightforward (check model variations).
• Limited user reviews: only 42 reviews at the time of writing; long-term durability not yet well established.
• Potential cold climate limitations: actual GPM drops significantly if incoming water is very cold; sizing may be tight for northern winters.

Comparison With Alternatives

To provide context, here is how the APUS 190,000 BTU unit compares with two popular alternatives: the Rheem RTEX-13 (electric tankless) and the Rinnai RL94e (gas tankless). Note that the APUS is propane-specific, while Rinnai offers both propane and natural gas versions.

Feature	APUS 190,000 BTU	Rinnai RL94e	Rheem RTEX-13
Fuel Type	Propane	Propane or Natural Gas	Electric
BTU / kW	190,000 BTU	199,000 BTU	13 kW (44,000 BTU equivalent)
Max GPM	8.1 GPM	9.5 GPM	3.1 GPM (at 45°F rise)
Min Activation Flow	0.79 GPM	0.26 GPM	0.5 GPM (typical)
Temperature Accuracy	±1°F	±1°F	±1°F
Smart Control	Wi-Fi (Tuya) + wired remote	Wi-Fi (Circ-Logic) + wired	None (manual dial)
Weight & Size	Compact (22.5 x 15.5 x 6.5 in)	Larger (28.5 x 20 x 9.5 in)	Compact (14 x 11 x 3.5 in)
Warranty	2 years full	12 years heat exchanger, 5 years parts	1 year parts, limited
Installation	Outdoor only, 120V needed	Indoor/outdoor options, 120V needed	Indoor, requires 240V 60A breaker

Rinnai RL94e is a more established brand with a higher max flow rate (9.5 GPM) and longer warranty on the heat exchanger. However, it is significantly larger and more expensive. The APUS offers comparable smart control at a lower cost.

Rheem RTEX-13 is an electric tankless unit, much simpler but limited to about 3.1 GPM – only suitable for small households or point-of-use. The APUS is clearly for larger demand.

Ultimately, the APUS sits in a value-oriented position: high output for the price, with smart features that are uncommon at this level. But it lacks the proven track record of Rinnai or Rheem.

Who Should Buy This Product?

Ideal Users

• Homeowners with propane gas supply who want endless hot water for multiple bathrooms.
• Those looking to replace a large tank water heater and free up indoor space (outdoor installation).
• People who appreciate smart home integration (Wi-Fi app control) and want to adjust temperature remotely.
• Homes with lower water pressure (0.79 GPM minimum activation).
• Budget-conscious buyers seeking a high-BTU tankless unit without the premium price of top-tier brands.

Not Ideal Users

• Those with natural gas lines (APUS offers a separate natural gas model, but the propane unit cannot be easily converted).
• Households in extremely cold climates where incoming water temperature drops below 40°F – the effective GPM may be lower than 6 GPM, possibly insufficient for simultaneous high demand.
• Anyone who wants indoor installation without significant venting modifications – this unit is outdoor-rated only.
• Users who demand immediate, flawless app connectivity – some have reported occasional issues.
• Those who want the longest possible warranty – the 2-year full warranty is shorter than some competitors’ 5-12 year coverage.

Expert Tips

1. Size your gas line correctly. A 190,000 BTU propane heater requires an adequate gas supply. Ensure your gas line diameter and length can deliver sufficient pressure (typically 11 inches water column for propane). Undersized lines lead to poor performance.
2. Install a sediment trap (drip leg) on the gas line before the unit to catch debris and moisture, protecting the burner.
3. Use a water filter on the inlet. Hard water or sediment can clog the heat exchanger. A simple Y-strainer with a flush valve helps maintain flow.
4. Consider a recirculation system if you have long pipe runs. The APUS doesn’t include a pump, but you can add an external one to get hot water faster at distant taps.
5. Test the Wi-Fi range before final wall mounting. The unit’s location may be far from your router; if the app connection drops, you’ll lose remote control capability.
6. Flush the unit annually with a descaling solution (vinegar or commercial descaler) if you have hard water. This prevents scale buildup that reduces efficiency and shortens lifespan.

Common Mistakes

1. Using the wrong propane tank size. Large residential propane tanks (250+ gallons) are needed for high-demand tankless heaters. Small 20 lb barbecue tanks will not supply enough volume for even a single shower.
2. Ignoring ventilation requirements. Although outdoor-rated, the unit still requires adequate airflow around it. Do not enclose it in a tight box or against a wall without sufficient clearance.
3. Skipping a pressure regulator. If your propane pressure is too high (above 14 inches W.C.), you must install a regulator. Check local codes.
4. Assuming installation is DIY. Gas and electrical work should be done by licensed professionals. Improper installation voids warranties and poses safety risks.
5. Forgetting to drain when stored for winter (e.g., in a seasonal cabin). Even with anti-freeze protection, a power outage could allow freeze damage.

Where to Buy

The APUS 190,000 BTU Outdoor Tankless Water Heater is primarily available through Amazon. It may also be found at select home improvement retailers or through APUS’s official website. Availability can vary.

For convenience, you can view the current listing here:

Check for bundle deals, warranty extensions, or additional accessories like optional mounting kits or external controllers.

Final Verdict

The APUS 190,000 BTU Tankless Water Heater delivers an attractive mix of high flow rate, smart control, and weather-resistant construction at a competitive price point. For households running on propane who need a whole-home solution, it offers a genuine alternative to bigger names like Rinnai or Rheem.

The key strengths are its ultra-low activation flow (good for low pressure), ±1°F temperature stability, and the inclusion of Wi-Fi and remote control – features not always found in this price bracket. The 2-year warranty is industry-average but shorter than some premium models. Early user feedback (4.3 stars, 42 reviews) suggests satisfactory performance for most installations.

We recommend this unit if you prioritize budget-friendly high capacity and smart features, and you have a propane supply. However, if you need proven long-term durability, a longer warranty, or the ability to handle extreme cold with high simultaneous demand, you might consider investing more in a Rinnai or Rheem system.

FAQ

1. Does the APUS water heater work with well water?

Yes, but you must ensure the water pressure is sufficient (above 0.79 GPM flow). Well water may contain sediment; install a whole-house filter before the heater to protect the heat exchanger.

2. Can this unit be installed indoors?

No. The manufacturer specifies outdoor installation only. Indoor installation without proper venting could lead to carbon monoxide buildup. There are indoor models available from other brands if needed.

3. How many showers can it run simultaneously?

Under ideal conditions with moderate incoming water temperature (e.g., 50-60°F), the unit can supply two showers running concurrently. Three may be possible in warmer climates or with lower flow showerheads. Performance drops with colder incoming water.

4. Does it require electricity?

Yes. It requires a standard 120V AC outlet to power the control board, Wi-Fi module, and anti-freeze heater. It will not operate during a power outage.

5. What is the warranty period?

APUS offers a 2-year full warranty on all components. Some sellers may offer extended warranties; check product listing details.

6. Can I use natural gas instead of propane?

This specific model (AP-AWH-W26LPG) is for liquid propane only. APUS may have a natural gas version (check ASIN). Do not attempt conversion; changing gas types requires different orifice sizes and control settings.

7. How long does it take to get hot water?

It heats water on demand, so the delay is similar to other tankless units – a few seconds after the tap is opened, depending on the distance from the heater. The flow sensor triggers ignition almost instantly.

8. Is professional installation required?

While not legally required in all areas, professional installation is strongly recommended for gas connections, electrical hookup, and compliance with local codes. Many warranties require proof of professional installation.

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