APUS Tankless Water Heater Review: Pros & Cons Worth Knowing

Introduction

If you’re upgrading your home’s hot water system, you’ve likely considered switching from a bulky storage tank to a compact on-demand unit. The APUS tankless water heater review is a topic many homeowners are searching for, especially those looking for an outdoor propane solution that can handle multiple showers and faucets simultaneously. The APUS 190,000 BTU outdoor tankless water heater promises whole-home hot water with smart controls and all-weather durability, but does it deliver? This APUS water heater review and rating takes an honest look at the specs, claimed performance, and real-world considerations to help you decide if it’s worth your investment. We’ll cover the pros and cons, what comes in the box, how to install and use it, and who should (and shouldn’t) buy it. By the end, you’ll have a clear picture of whether this unit fits your needs.

Before diving in, if you want to see the latest pricing and availability, you can check the APUS tankless water heater on Amazon.

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

This is a propane-powered, wall-mounted tankless water heater designed for outdoor installation. It delivers up to 8.1 gallons per minute (GPM) and has a heat output of 190,000 BTUs. The unit is intended for whole-house use, supporting up to five outlets simultaneously (manufacturer claims three showers plus two faucets). It includes WiFi connectivity through the Tuya smart home app and a wired remote controller, allowing temperature adjustments between 95°F and 149°F with ±1°F accuracy. The compact dimensions (22.48 x 15.51 x 6.54 inches) make it easy to mount on an exterior wall, freeing up indoor space. It operates on 120V AC and uses standard 3/4-inch water and gas connections. The heat exchanger is made from 100% oxygen-free copper, which the manufacturer says is 30% more efficient than conventional designs. It also features intelligent staged combustion technology for 20% energy savings. The unit is built to withstand harsh weather with a 10-level wind resistance rating and electric anti-freeze protection. Safety features include freeze, overheat, and flame failure safeguards, backed by a 2-year full warranty.

Key Features & Specifications

• Power Source: Liquid Propane (also available in natural gas versions).
• Flow Rate: 8.1 GPM at a 35°F temperature rise (lower in colder climates).
• Heat Output: 190,000 BTU.
• Maximum Temperature: 149°F.
• Voltage: 120V AC (standard household outlet).
• Smart Features: Works with Tuya smart home app for remote temperature control; includes a wired remote controller.
• Heat Exchanger: 100% oxygen-free copper with intelligent staged combustion.
• Mount Type: Wall-mounted outdoors.
• Dimensions: 22.48 x 15.51 x 6.54 inches (H x W x D).
• Minimum Flow Rate: 0.79 GPM (allows operation even with low water pressure).
• All-Weather Design: Wind-resistant (10-level rating) and electric anti-freeze protection.
• Safety: Freeze, overheat, flame failure protection.
• Warranty: 2-year full warranty on components.

Specification	Value
Power Source	Liquid Propane
Flow Rate	8.1 GPM
BTU	190,000
Max Temp	149°F
Voltage	120V AC
Dimensions	22.48 x 15.51 x 6.54 in
Weight	Approx. 50 lbs (unconfirmed)

The specifications are competitive for a mid-range outdoor tankless heater. The 8.1 GPM is sufficient for most households, but actual performance depends on incoming water temperature and the number of simultaneous demands.

What’s Included in the Box

According to the manufacturer, the package contains:

• The tankless water heater unit (gray)
• A wired remote controller with cable
• Mounting screws, wall anchors, and expandable screws
• Closed circuit terminals
• Installation and owner’s manual

Note that gas fittings, water lines, and propane tank are not included. You’ll need to provide those separately. The remote controller is optional but recommended for convenience. The manual provides step-by-step guidance for installation, which should be performed by a licensed professional due to gas and electrical requirements.

How to Use

Setup

Installation should be handled by a qualified technician, especially for gas line connections and venting. The unit must be mounted outdoors (or in a well-ventilated area per local codes). It requires a 120V AC outlet nearby and standard 3/4-inch water and gas lines. The remote controller can be mounted inside for easy temperature adjustments. After connecting gas, water, and power, purge the gas line and check for leaks. Then follow the manual to set the desired temperature (default 120°F recommended for safety).

Operation

Once installed, the heater operates on demand. When a hot water tap is opened, the unit detects flow and ignites the burner. The WiFi feature allows you to adjust temperature remotely via the Tuya app (available for iOS and Android). The wired controller gives you local control. The unit automatically modulates to maintain the set temperature within ±1°F. In summer, the smart seasonal technology adjusts gas consumption for efficiency.

Maintenance

Regular maintenance includes cleaning the water filter (annual) and checking for debris. The oxygen-free copper heat exchanger is corrosion-resistant but should be inspected periodically. If you live in a hard water area, descaling may be needed every 2-3 years. The manufacturer recommends flushing the system with a descaling solution. Also, ensure the outdoor unit is free from snow, leaves, and insect nests. The electric anti-freeze protection activates when temperatures drop, but the user manual advises shutting down and draining the unit if power is lost during freezing conditions.

Troubleshooting

Common issues and their likely causes (based on manufacturer info):

• No hot water: Check propane supply, ensure gas valve is open, and verify power to the unit. Minimum flow rate must be above 0.79 GPM.
• Fluctuating temperature: Could be due to multiple outlets running simultaneously or a dirty water filter. Also, check for proper gas pressure.
• Error codes: The display shows codes for flame failure, overheat, etc. Refer to the manual for specific code meanings.
• WiFi not connecting: Verify the app and unit are on the same 2.4 GHz WiFi network. Restart the router and the heater.

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

Performance & User Experience

Based on the manufacturer’s claims and user reviews (4.3 out of 5 stars from 42 ratings), the APUS tankless water heater generally meets expectations for a propane unit in its class. The 8.1 GPM flow rate is ideal for households with moderate simultaneous demand—two showers and a kitchen faucet should be manageable, though colder incoming water temperatures will reduce output. Users report that the temperature stability is good, with the ±1°F accuracy being a noticeable upgrade over older tank heaters. The WiFi feature is appreciated for convenience, though some mention occasional app disconnections.

The compact size and outdoor installation free up indoor closet space. The wind resistance and anti-freeze protection add reliability in exposed locations. However, the actual energy savings depend on usage patterns; the 20% savings over conventional units is the manufacturer’s figure and may vary. Some users note that installation complexity is higher than a simple tank swap, and propane delivery can be a recurring cost.

Overall, performance is solid for the price point, but it’s not a premium unit. Expect normal variations in flow rate with multiple simultaneous draws, especially in winter when groundwater is colder.

Pros and Cons

Pros

• High flow rate (8.1 GPM) suitable for most households.
• Smart home integration (WiFi + remote control).
• Compact design saves indoor space.
• All-weather construction with wind resistance and anti-freeze.
• Low minimum flow rate (0.79 GPM) for low-pressure homes.
• Oxygen-free copper heat exchanger for improved efficiency and durability.
• 2-year warranty.

Cons

• Requires professional installation (gas and electrical).
• Outdoor-only installation may not work for all homes.
• Maximum output decreases with colder incoming water.
• WiFi connectivity can be inconsistent.
• Limited number of user reviews (42) means less data on long-term reliability.
• Propane fuel costs vary by region and tank delivery.

Comparison With Alternatives

The APUS competes with other outdoor propane tankless heaters like the Rheem RTGH-95DVLN (9.5 GPM, 199,000 BTU) and the EcoSmart ECO 27 (27 kW electric, 5.7 GPM). Here’s a quick comparison based on specifications:

Feature	APUS 190,000 BTU	Rheem RTGH-95DVLN	EcoSmart ECO 27
Fuel Type	Propane	Propane/Natural Gas	Electric
Flow Rate	8.1 GPM	9.5 GPM	5.7 GPM
BTU	190,000	199,000	92,000 (electric equivalent)
WiFi Control	Yes (Tuya)	Optional module	No
Heat Exchanger	Oxygen-free copper	Copper with stainless steel	Copper
Dimensions	22.5 x 15.5 x 6.5 in	28.5 x 18.5 x 10.5 in	17 x 17 x 8.75 in
Warranty	2 years	10 years on heat exchanger, 5 years parts	Lifetime on heat exchanger
Installation Type	Outdoor	Indoor/Outdoor	Indoor/Outdoor

The Rheem offers a higher flow rate and longer warranty, but is larger and more expensive. The EcoSmart is electric and easier to install if you have adequate electrical service, but its flow rate is lower. The APUS strikes a balance between features and cost, with the added convenience of WiFi control. For more details on tankless water heater efficiency, you can check the Energy.gov guide on tankless water heaters.

Who Should Buy This Product?

Ideal Users

• Homeowners with a propane supply or willing to install a propane tank.
• Those who want to reclaim indoor closet space occupied by a traditional tank.
• Households with 2-3 bathrooms needing simultaneous hot water.
• Tech-savvy users who appreciate remote temperature control via app.
• People living in climates where outdoor installation is feasible (not extremely cold year-round).

Not Ideal Users

• Those without access to propane or natural gas (consider electric models).
• Homes with very high demand (4+ bathrooms) may need a larger unit or dual installation.
• Users who prefer indoor installation (this model is outdoor-rated only).
• Buyers on a strict budget who can’t afford professional installation.
• Those who require a very long warranty period (compare with competitors that offer longer heat exchanger warranties).

Expert Tips

1. Pre-installation planning: Measure your peak hot water demand (GPM) and compare with the unit’s output at the coldest incoming water temperature in your area. Use a simple online calculator or consult a plumber.
2. Propane tank sizing: Ensure your propane tank is sufficiently large and has a regulator that can supply the required BTUs (190,000). A 100-gallon tank is typically adequate for a household.
3. Water quality: If you have hard water, consider installing a whole-house water softener to reduce scale buildup in the heat exchanger.
4. WiFi setup: Use a dedicated 2.4 GHz network for the heater to minimize connection issues. Place the router within range of the outdoor unit if possible.
5. Regular flushing: Even with a filter, mineral deposits can form. Flush the heat exchanger with white vinegar or a commercial descaling solution once a year.

Common Mistakes

1. Not checking flow rate needs: Many buyers assume 8.1 GPM is enough for any home, but if you have high-flow showerheads or multiple large tubs, you may run out of hot water in winter.
2. Skipping professional installation: Gas leaks or improper venting can be dangerous. Always hire a licensed gas fitter or plumber.
3. Placing the unit in an unventilated area: Although outdoor-rated, the unit must have clearance for combustion air and exhaust. Avoid recessed alcoves.
4. Ignoring the minimum flow rate: If your home has low water pressure, the unit may not turn on. Check that taps deliver at least 0.79 GPM.
5. Forgetting about freeze protection power: The anti-freeze feature requires electricity. During extended power outages in freezing weather, drain the unit to prevent damage.
6. Not reading the manual’s error code section: Many troubleshooting calls can be avoided by understanding common codes.

Where to Buy

The APUS tankless water heater is available on Amazon and through select online retailers. Purchasing from a reputable seller ensures warranty support and easy returns. The product at the time of writing has a 4.3-star rating from 42 customer reviews. You can view current details and availability at the link below.

Final Verdict

The APUS 190,000 BTU outdoor tankless water heater offers a compelling package for homeowners making the switch to on-demand propane hot water. Its smart features, compact size, and decent flow rate make it a strong contender in the mid-range market. The oxygen-free copper heat exchanger and all-weather durability add value. However, installation costs and the need for a propane supply are important factors to weigh. Based on the APUS tankless water heater review honest opinion, this unit is a worthwhile investment for those who match the ideal user profile and are prepared for the upfront expenses. The APUS tankless water heater review verdict is that it’s a solid choice with few major drawbacks, backed by a reasonable warranty. For a more comprehensive assessment, we recommend reading additional user feedback and consulting a local installer to confirm compatibility with your home’s setup.

FAQ

1. Can the APUS tankless water heater be installed indoors?

No, this model is designed for outdoor installation only. It is not certified for indoor use due to venting and gas safety requirements.

2. Does it come with a propane conversion kit for natural gas?

This specific unit is factory set for propane. APUS also offers natural gas versions (check your model number). Do not attempt to convert between fuels without a proper kit.

3. How long does the WiFi remote control range extend?

The WiFi connection relies on your home network. The unit itself must be within range of your router. The wired remote controller cable is included and can be run up to 50 feet (based on typical controller cables).

4. What happens if the power goes out?

Without electricity, the unit will not operate. In freezing conditions, manual draining is required to prevent water damage. The electric anti-freeze only works when power is available.

5. Is this unit eligible for energy efficiency tax credits?

Currently, federal tax credits for tankless water heaters apply to ENERGY STAR certified models with a UEF of 0.90 or higher. Check the specific energy factor of the APUS unit against current IRS guidelines, as they change yearly. Consult a tax professional.

6. Can I use an extension cord for the 120V power?

The manufacturer recommends directly connecting to a grounded outlet. Using an extension cord may cause voltage drop or safety hazards. If necessary, use a heavy-duty outdoor-rated cord as short as possible.

7. What size propane tank do I need?

A minimum of 100-gallon propane tank is recommended for continuous use. For occasional use, a 20-pound BBQ tank may work but will run out quickly under high demand. Consult your propane supplier for proper sizing.

8. How noisy is the unit during operation?

User reviews describe it as moderately quiet—similar to a gas furnace. The burner makes a humming sound when firing, but it is not disruptive when installed outdoors.

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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. The content of this article is based on publicly available product data and our independent analysis. Pricing and availability are subject to change.