APUS 190,000 BTU Tankless Water Heater Review: Honest Pros & Cons

Introduction

If you’re in the market for a whole-home tankless water heater that can handle multiple showers and faucets simultaneously, the APUS 190,000 BTU tankless water heater review on this page will help you decide if it’s the right fit. This propane-powered unit promises up to 8.1 GPM, WiFi control, and an outdoor-friendly design. We’ve analyzed the manufacturer’s specifications, user feedback, and industry standards to give you a balanced, honest look at what this water heater can and cannot do. Whether you’re replacing an old storage tank or building a new home, this review covers everything you need to know before buying. For current availability, check the APUS 190,000 BTU Tankless Water Heater on Amazon.

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

The APUS 190,000 BTU outdoor tankless water heater is a propane-powered, on-demand water heating system designed for whole-home use. It is categorized as a high-efficiency condensing unit that supports up to five outlets simultaneously. The heater connects to a 120V AC power source and uses intelligent staged combustion to regulate energy output. Target users include homeowners looking to replace bulky storage tank heaters, those with moderate to high hot water demand (e.g., a family of four to six), and anyone who prefers an outdoor installation to save indoor space.

Key Features & Specifications

The APUS 190,000 BTU unit packs several notable features. Below is a quick overview of its core specifications based on manufacturer data.

Specification	Details
Heat Output	190,000 BTU
Flow Rate	8.1 GPM
Power Source	Liquid Propane (NG conversion not included)
Temperature Range	95°F – 149°F (adjustable via app or remote)
Temperature Accuracy	±1°F (manufacturer claim)
Min. Flow Rate	0.79 GPM (ultra-low startup)
Heat Exchanger	100% oxygen-free copper
Wind Resistance	10-level rating
Smart Features	Works with Tuya APP, wired remote controller included
Dimensions	22.48 x 15.51 x 6.54 inches
Weight	Approx. 42 lbs (estimated from similar models)
Connections	3/4-inch NPT for water and gas
Warranty	2-year full warranty on components

Key features explained:

• Whole-home capacity: At 190,000 BTU and 8.1 GPM, the unit is rated to handle three showers and two faucets simultaneously under average conditions. Actual performance depends on incoming water temperature and flow demands.
• WiFi & remote control: The built-in Tuya-compatible module allows temperature adjustments from a smartphone, along with a wired controller for manual changes. This provides convenient temperature fine-tuning from anywhere within range.
• Compact outdoor design: With a depth of only 6.54 inches, this wall-mounted heater leaves minimal footprint. The weather-resistant casing includes electric anti-freeze protection and wind-resistant construction.
• Advanced heat exchanger: The company claims a 100% oxygen-free copper exchanger that is 30% more efficient than conventional water heaters. Combined with staged combustion, it aims for 20% energy savings over standard models.
• Low flow startup: The 0.79 GPM minimum flow makes it suitable for homes with lower water pressure, though actual activation may vary.

What’s Included in the Box

According to the manufacturer, the package contains:

• APUS tankless water heater unit (propane, 8.1 GPM, 190,000 BTU)
• Wired remote controller with cable
• Mounting bracket and screws (4 mounting screws, 6 wall anchors, expandable screw)
• Closed circuit terminal (2 pieces)
• Installation and owner’s manual

Setup overview: The unit requires a 120V AC outlet nearby, a propane supply line with a shut-off valve, and proper venting (outdoor installation eliminates the need for a vent pipe since it’s designed for outside use). The included remote controller can be mounted indoors for easy access. The manual provides step-by-step instructions for wall mounting and gas/water connections. Professional installation is strongly recommended for gas and electrical hookups.

How to Use the APUS Tankless Water Heater

Setup

Installation must comply with local building codes. The heater should be mounted on a solid exterior wall, away from windows, doors, and obstructions. Connect the 3/4-inch water and gas lines, then plug the unit into a 120V AC grounded outlet. Turn on the propane supply and check for gas leaks using soapy water. Power on the unit and set the desired temperature using the wired controller or the Tuya app (download and pair via WiFi).

Operation

Once installed and powered, the heater activates automatically when a hot water tap is opened. The built-in burner modulates to maintain the set temperature within ±1°F. Users can adjust the temperature between 95°F and 149°F. The app also offers scheduling features and real-time temperature monitoring.

Maintenance

Routine maintenance includes:

• Flushing the heat exchanger with a descaling solution every 6–12 months (especially in hard water areas).
• Cleaning the inlet water filter regularly.
• Inspecting the vent (outdoor models require less frequent checks).
• Checking for error codes on the display or app.

Troubleshooting

Common issues reported by users:

• Water not heating: Check gas supply, electrical connection, or error codes (e.g., ignition failure).
• Fluctuating temperature: Ensure water flow is above the minimum (0.79 GPM) and that the filter is clean.
• WiFi connection drops: Reposition the router or ensure the unit is within range. Restart the app or re-pair the device.

Performance & User Experience

The APUS 190,000 BTU outdoor tankless water heater is designed to deliver instant hot water to multiple points of use. Based on the manufacturer’s claims and typical user feedback:

• Flow rate at 8.1 GPM is sufficient for a typical 4-5 bedroom home with moderate hot water demand. However, in cold climates where incoming water temperature is very low (e.g., below 50°F), the actual GPM may be lower. Users in northern regions should expect around 5–6 GPM at a 45–55°F temperature rise.
• Ultra-low minimum flow (0.79 GPM) helps prevent cold water sandwiching in low-flow faucets, a common issue with many tankless heaters.
• WiFi control works reliably for most users, though occasional lag or disconnects have been noted. The Tuya app is widely used and supports voice assistants like Alexa and Google Home.
• Outdoor durability – the 10-level wind resistance and electric anti-freeze protection (down to -4°F, per typical specs) make it suitable for exposed installations. However, in regions with extreme cold, additional insulation or a freeze protection kit may be needed.
• Energy efficiency – the intelligent staged combustion adjusts burner output based on demand, potentially saving energy compared to a unit that runs at full capacity at all times.

Overall, the unit offers strong performance for its price bracket, with the convenience of smart controls. Some users have reported minor issues with the remote controller cable length or initial WiFi setup, but these are not deal-breakers.

Pros and Cons

Pros

• High BTU output (190,000) supports multiple simultaneous outlets.
• Smart WiFi control via Tuya app for remote temperature adjustment.
• Compact dimensions allow easy outdoor wall mounting.
• Low minimum flow rate reduces temperature fluctuations.
• 100% oxygen-free copper heat exchanger for better heat transfer.
• Wind-resistant and freeze protection for outdoor use.
• 2-year warranty on components.
• Includes wired remote controller for manual operation.

Cons

• Requires 120V electrical connection (not battery or self-powered).
• Professional installation recommended, adding to overall cost.
• In cold climates, flow rate may drop below 8.1 GPM at high temperature rise.
• App and WiFi setup can be finicky for some users.
• Limited brand recognition compared to established players like Rheem or Rinnai.
• No included conversion kit for natural gas (propane-only model).
• Remote controller cable is relatively short (approx. 5 feet).

Comparison With Alternatives

To give you a clearer picture, here’s how the APUS 190,000 BTU unit compares to two popular alternatives in the same category.

Feature	APUS 190,000 BTU	EcoSmart ECO 27	Rheem RTEX-13
Power Source	Propane (gas)	Electric (27 kW)	Electric (13 kW)
BTU / kW	190,000 BTU	27 kW = 92,000 BTU	13 kW = 44,000 BTU
Max Flow	8.1 GPM	5.1 GPM (at 77°F rise)	2.9 GPM (at 77°F rise)
Smart Control	WiFi + wired remote	None (manual dial)	None (digital display)
Installation	Outdoor only	Indoor/outdoor	Indoor
Warranty	2 years	Limited lifetime	6 years
Heat Exchanger	Oxygen-free copper	Copper and stainless	Copper
Weather Rating	Wind-resistant, freeze protection	N/A (indoor use typical)	N/A

EcoSmart ECO 27 is an electric unit that offers slightly lower flow but no gas line needed. It’s a good alternative if you don’t have propane access. Rheem RTEX-13 is a smaller electric unit suitable for point-of-use or small homes. The APUS is clearly positioned for whole-home gas applications with smart features.

Who Should Buy This Product?

Ideal users:

• Homeowners with access to propane (e.g., rural areas, off-grid homes).
• Families needing consistent hot water for 3+ simultaneous uses.
• DIY enthusiasts comfortable with gas connections (or hiring a professional).
• Those who want smart home integration and remote temperature control.
• People who prefer an outdoor installation to free up indoor space.

Not ideal if:

• You only have natural gas (conversion kit not included).
• Your hot water demand is very high in freezing climates (you may need a larger unit or preheater).
• You need a silent electric heater (propane models produce combustion noise).
• You prefer a national brand with extensive local service networks.

Expert Tips

1. Size your system properly. For a four-person home in a mild climate, 8.1 GPM is usually enough. In colder regions, consider a unit with higher GPM or a supplementary heater.
2. Install a sediment filter on the incoming water line to protect the heat exchanger from debris and scale buildup.
3. Use the app’s scheduling feature to lower temperature during low-demand periods (e.g., at night) to save gas.
4. Verify gas line size. The unit requires a propane supply line with adequate pressure (typically 11” WC). An undersized line can cause poor performance.
5. Test the minimum flow. Some low-flow faucets may not activate the heater. If you have motion-sensor faucets, check compatibility.
6. Keep the manual handy for error codes. The unit will display codes for issues like flame failure or overheating, which are often simple to fix.

Common Mistakes to Avoid

1. Skipping professional installation. Gas and electrical connections require expertise. Incorrect installation can void the warranty and create safety hazards.
2. Ignoring incoming water temperature. In winter, ground water can be 35–45°F, reducing the heater’s effective flow rate by 30% or more.
3. Forgetting to descale. Hard water will rapidly reduce efficiency. Descaling every 6–12 months is crucial.
4. Placing the remote controller in a wet location. The wired controller is not waterproof; install it inside away from direct moisture.
5. Assuming WiFi works without a stable 2.4 GHz network. The Tuya module only works on 2.4 GHz bands, not 5 GHz.
6. Overlooking the minimum gas pressure requirement. Check your propane tank regulator to ensure it supplies at least 11” WC.

Where to Buy

The APUS 190,000 BTU tankless water heater is available through major online retailers. For the most up-to-date stock and shipping options, you can visit the product page on Amazon.

Final Verdict

The APUS 190,000 BTU tankless water heater review and rating shows it is a well-rounded propane unit for whole-home hot water needs. It offers competitive features like WiFi control, a low minimum flow rate, and a robust heat exchanger. While it may not match the brand recognition of Rheem or Rinnai, its performance and smart capabilities make it a strong contender for budget-conscious homeowners who prioritize convenience and space savings.

Is the APUS 190,000 BTU tankless water heater worth buying? If you have propane and need an outdoor unit that can handle multiple simultaneous hot water uses, this heater delivers solid value. The APUS tankless water heater review pros cons are balanced, with the main drawbacks being the need for a dedicated electrical outlet and professional installation. For most families, the APUS 190,000 BTU tankless water heater honest opinion is that it performs reliably when set up correctly, and the APUS propane water heater review verdict is a positive one for its price point and feature set.

Frequently Asked Questions

Can the APUS 190,000 BTU unit be converted to natural gas?

According to the product details, this is a propane-only model. A separate natural gas conversion kit is not included, and the manufacturer does not specify compatibility. If you need a natural gas model, look for APUS units labeled for NG.

What is the minimum water flow needed to activate the heater?

The manufacturer states a minimum flow of 0.79 GPM. In practice, some users report that very low-flow faucets (e.g., 0.5 GPM) may not trigger ignition. Consider flow restrictors if you experience issues.

How loud is the unit during operation?

Like most tankless propane heaters, it produces a moderate burner noise (estimated 55–65 dB). It is not silent, but outdoor installation typically reduces indoor noise.

Does the WiFi control work with Amazon Alexa or Google Home?

Yes, the Tuya app is compatible with both Alexa and Google Assistant, allowing voice control of temperature and on/off scheduling.

Can I install this heater in an enclosed outdoor space?

The unit is designed for outdoor installation only. Installing it in an enclosed space (e.g., a shed or garage) without proper venting is unsafe due to carbon monoxide risk. Always follow local codes.

What is the warranty period?

APUS offers a 2-year full warranty on all components. This covers defects in materials and workmanship, but not damage from improper installation or neglect.

Will the unit work with a well water system?

Yes, as long as the incoming water pressure is between 15–150 PSI (typical for well systems). The low minimum flow makes it suitable for weaker well pumps. Install a sediment filter to protect the heat exchanger.

How do I reset the heater after an error code?

Turn off the power for 30 seconds, then restart. If the error persists, consult the manual for specific code meanings. Common codes like E1 (ignition failure) may indicate a gas supply issue.

Stay Informed

Get the latest product reviews, home improvement tips, and exclusive deals delivered to your inbox. Subscribe to our newsletter for updates on water heaters, HVAC, and more.

Email address:

Subscribe

Affiliate Disclosure

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This post contains affiliate links, which means we may earn a small commission if you make a purchase through these links at no extra cost to you. All opinions remain our own, and we only recommend products we believe in. For more information, please see our full disclosure page.