Table of Contents

Introduction

If you’re looking for an efficient, whole-home water heating solution that doesn’t take up a closet or basement space, an outdoor tankless propane heater might be exactly what you need. The APUS 190000 BTU water heater has been generating interest among homeowners who want on-demand hot water for multiple bathrooms and appliances. But before you commit to this unit, it’s worth understanding its real-world capabilities, its smart features, and whether it’s a good fit for your household. In this APUS 190000 BTU water heater review, we’ll walk through the specs, performance expectations, pros and cons, and help you decide if this propane tankless water heater deserves a spot on your exterior wall.

This APUS tankless water heater review and rating is based on manufacturer data, user feedback, and industry standards. We’ll avoid exaggerated claims and focus on what you can realistically expect. If you’re comparing tankless options, our APUS propane water heater review pros cons will give you a balanced view. Let’s see if the APUS 190K BTU model lives up to its promise.

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

The APUS 190,000 BTU tankless water heater is a propane-powered, on-demand hot water system designed for outdoor installation. It supports up to five outlets simultaneously (for example, three showers and two faucets) and delivers a flow rate of up to 8.1 gallons per minute (GPM). The unit aims to replace bulky storage-tank water heaters with a compact, wall-mounted design that heats water only when needed.

This model is part of APUS’s lineup and is identified by model number AP-AWH-W26LPG. It connects to a standard 120V AC outlet, uses 3/4-inch water and gas connections, and includes both a wired remote controller and smart app control via the Tuya platform. It’s intended for whole-home use in moderate to warm climates, though it includes wind resistance and electric anti-freeze protection for colder conditions.

If you’ve been searching for an APUS 190000 BTU review honest opinion, know that this is a mid-range unit that emphasizes efficiency and smart functionality. It’s not a premium brand like Rinnai or Noritz, but it offers comparable features at a different price point. The APUS water heater review verdict will help you determine whether the trade-offs are acceptable for your home.

Key Features & Specifications

Below is a breakdown of the most important features based on the manufacturer’s product page. We present these without embellishment so you can evaluate them objectively.

Heat Output & Flow Rate

BTU Rating: 190,000 BTUs (propane) – this determines how much heat the burner can produce to raise incoming cold water temperature to your desired set point.
Flow Rate: 8.1 GPM – the maximum volume of hot water the unit can deliver per minute at a given temperature rise. Actual flow will vary based on incoming water temperature and desired output temperature.
Minimum Flow Activation: 0.79 GPM – allows the unit to fire up even with low water pressure, useful in homes with weak well pumps or older plumbing.

Temperature Control

Remote Control: Includes a wired controller (optional, comes in box) and app control via the Tuya Smart app (iOS/Android). Temperature range: 95°F to 149°F.
Stability: Claimed ±1°F accuracy. This is typical for modern tankless units and is generally reliable if gas pressure and flow remain steady.

Construction & Efficiency

Heat Exchanger: 100% oxygen-free copper – manufacturer claims 30% more efficient than conventional water heaters. Note: “conventional” likely refers to older tank models, not all tankless units.
Combustion Technology: Intelligent staged combustion – varies burner output to match demand, leading to up to 20% energy savings compared to standard gas tank heaters.
Mount Type: Wall-mount, outdoor use only.
Dimensions: 22.48 x 15.51 x 6.54 inches – relatively compact for a 190K BTU unit.

Weather & Safety

Wind Resistance: Rated for 10-level wind – helps maintain stable flame in breezy conditions.
Anti-Freeze Protection: Electric heating element inside the unit to prevent freezing in cold weather (requires power). This is not a full winterization solution; see common mistakes below.
Safety Features: Freeze protection, overheat shut-off, flame failure detection, and a 2-year warranty on components.

Specification	Value
Power Source	Liquid Propane (NG conversion kit? Not included)
Flow Rate	8.1 GPM
Max Temperature	149°F
Heat Output	190,000 BTU
Voltage	120V AC
Smart Home	Tuya App compatible
Mount Type	Wall-mount (outdoor)
Warranty	2 years (parts)

What’s Included in the Box

According to the product listing, the APUS 190K BTU water heater comes with the following items:

Main tankless water heater unit
Wired remote controller (optional, included) with controller cable
Mounting hardware: expandable screw x1, wall anchors x6, mounting screws x4
Closed circuit terminals x2 (used for gas valve connection)
Installation and owner’s manual

The box does not include a gas conversion kit (propane to natural gas) or a dedicated electrical plug – the unit requires a standard 120V outlet nearby. You may also need additional gas shutoff valves, a sediment trap, and venting materials if local codes require a specific exhaust path (though outdoor units generally have less restrictive venting).

How to Use

Setup

Installation should be performed by a licensed plumber or gas fitter. The unit must be mounted outdoors on a solid wall with adequate clearance (check local codes). Connect 3/4-inch gas and water lines, and plug the unit into a 120V GFCI-protected outlet. The wired remote controller can be mounted inside the home if desired. For app control, download the Tuya Smart app, create an account, and pair the unit via Wi-Fi (the manufacturer states it works with Tuya).

Operation

Once installed, turn on a hot water tap. The unit will ignite when flow exceeds 0.79 GPM. Adjust the temperature using the remote or app. The display shows current water temp and error codes if any. To avoid freezing, keep the unit powered on and the water pressure maintained – the electric anti-freeze element only works when power is supplied.

Maintenance

Annual maintenance is recommended: flush the heat exchanger with a descaling solution (vinegar or commercial descaler) to remove mineral buildup, especially if you have hard water. Clean the inlet filter screen every few months. Inspect the exhaust and air intake openings for debris or ice blockage. The manual provides detailed instructions.

Troubleshooting

Common error codes include E0 (no ignition) – check gas supply, E1 (thermistor fault), and E9 (freeze alarm). The manual lists most codes. If the unit doesn’t fire, first ensure the gas valve is open and that the minimum flow rate is met. For persistent issues, contact APUS customer support under warranty.

Performance & User Experience

Because we have not personally tested this unit, we rely on manufacturer specifications and aggregated user reviews (currently 4.3 stars out of 42 ratings on Amazon). Here’s what the data suggests:

The 190,000 BTU output is sufficient for most homes in moderate climates (groundwater temperatures around 50-60°F). At a 35°F temperature rise (e.g., from 50°F to 105°F), the maximum flow rate is around 8 GPM. In colder regions where incoming water may be 40°F, the flow will drop – possibly to 5-6 GPM – so you might only run 2 showers simultaneously. The unit’s ability to handle “3 showers + 2 faucets” is an optimistic estimate under ideal conditions.

Users generally report stable temperature control, though some mention occasional fluctuations when multiple fixtures are turned on/off. The app connectivity is praised for convenience but can have pairing hiccups (common with Tuya devices). The wind-resistant design seems effective for most patios and balconies, but extreme storms could shut down the unit temporarily (safety feature).

The 0.79 GPM minimum activation is lower than many tankless heaters (often 0.5-1.0 GPM), which helps if you have low-flow showerheads or weak well pressure. However, extremely low flow (e.g., a trickle) will still prevent ignition.

No major safety incidents reported. The 2-year warranty is shorter than some competitors (Rinnai offers 5-15 years), which is a notable difference. On the positive side, the copper heat exchanger is a durable choice.

Pros and Cons

Pros

Compact, outdoor design saves indoor space and simplifies venting.
Smart app control works with Tuya, offering remote temperature adjustment and scheduling.
Low minimum flow activation (0.79 GPM) works well with low water pressure.
Wind-resistant construction (10-level rated) helps stability in breezy conditions.
Oxygen-free copper heat exchanger is corrosion-resistant and efficient.
±1°F temperature stability is competitive for this class.

Cons

2-year warranty is shorter than many competitors (3-12 years is common).
No natural gas conversion kit included – must purchase separately if switching gases.
Limited user reviews (42 ratings) – long-term reliability is less proven.
Brand reputation – APUS is less known than major tankless manufacturers (Rinnai, Noritz, Rheem).
Outdoor only – cannot be installed indoors without additional venting (check local codes).
App performance may be inconsistent due to Tuya network issues.

Comparison With Alternatives

When considering the APUS 190000 BTU water heater review, it’s helpful to see how it stacks up against similar propane tankless units. Note: We compare features only, no prices.

Rinnai V65iP (180,000 BTU)

Flow: 6.5 GPM (same capacity, slightly less)
Warranty: 5 years heat exchanger, 2 years parts
Smart features: Yes (with Wi-Fi module)
Mount: Indoor or outdoor
Key difference: Established reliability, better warranty, but lower maximum flow and typically higher cost.

Rheem RTEX-36 (Electric, 36 kW – not propane)

Not a direct competitor, but included for homeowners considering electric options. Requires heavy electrical upgrade (150A+).

Ecosmart ECO 27 (Electric, 27 kW)

Again electric, but illustrates that the APUS propane unit avoids large electrical demand.

Gasland GP-190 (almost identical specs)

Flow: 8.1 GPM, 190,000 BTU
Warranty: 2 years
Smart: No Wi-Fi (but has remote)
Key difference: Similar performance, no app, often slightly lower price.

The APUS stands out for its Wi-Fi connectivity and low-flow capability. The shorter warranty is a trade-off that buyers should weigh against their needs for longevity.

Who Should Buy This Product?

Ideal Users

Homeowners looking for an outdoor propane tankless heater to free up space.
Those who want Wi-Fi control to monitor and adjust temperature remotely.
Homes with moderate water demand (2-3 bathrooms) in milder climates.
Users comfortable with a 2-year warranty and a less established brand.
Owners with existing propane service (no gas line conversion needed).

Not Ideal For

homes in very cold regions (incoming water below 40°F) – flow will be limited.
Those who need a proven, long-term solution with extended warranty support.
Large families with simultaneous high-flow use (e.g., 3 showers + 2 faucets + washing machine).
Installations requiring indoor placement without expensive venting.

Expert Tips

Install a water softener or whole-house sediment filter if you have hard water. Mineral scale will reduce heat exchanger efficiency and shorten the unit’s life.
Keep the unit powered on even in winter to utilize the electric anti-freeze function. However, this is not a guarantee against freezing if power fails – consider a freezeless valve or insulation on water lines outside.
Test the app before finishing installation. Some users report difficulty pairing; having the Wi-Fi close to the unit helps.
Use a qualified installer who has experience with tankless gas units, especially for propane. Improper gas sizing can lead to poor performance.
Set the temperature at 120°F for most tap uses to avoid scalding risk and reduce scale buildup. Use the remote to adjust higher if needed.

Common Mistakes

Not checking gas line size. A 190,000 BTU burner requires a sufficient propane supply line (often 1/2-inch or larger depending on distance). Undersized lines cause flame flickering and temperature drops.
Mounting in a location exposed to direct rain or snow. While weather-resistant, it’s not waterproof. Place under a roof overhang or use a weather cover (not included).
Forgetting to flush the heat exchanger annually. This is essential in hard-water areas; neglect leads to flow reduction and overheating errors.
Relying solely on anti-freeze protection. The electric heater only works when power is on and water is flowing. If power goes out during a freeze, damage can occur. Drain the unit if not used in winter.
Ignoring vent clearance requirements. Even outdoor units need clear space around the exhaust (18 inches from windows, soffits, etc.) per local codes.

Where to Buy

The APUS 190,000 BTU tankless water heater is sold exclusively through Amazon as of writing. It’s listed under ASIN B0FHH9RW9J. Buying via the official Amazon listing ensures you receive the product and warranty support. Beware of third-party resellers on other sites. For the best information, you can click the button below to view the product page.

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Final Verdict

After reviewing the specifications, user feedback, and comparing it with alternatives, here is our APUS water heater review verdict: The APUS 190,000 BTU propane tankless water heater is a capable unit that offers solid performance for its price range. Its strengths are its compact outdoor design, low-flow activation, and Wi-Fi connectivity – features that are often found only in higher-priced models. However, the 2-year warranty and limited track record mean it may not be the best choice for those seeking a long-term investment without proactive maintenance.

For homeowners with moderate hot water demand and a willingness to handle periodic descaling and proper winter precautions, this unit can deliver reliable hot water. If you prioritize warranty length and brand heritage, you might lean toward Rinnai or Rheem propane models. Ultimately, the APUS propane water heater review pros cons tip in favor of value and smart functionality, but the cons are real. It’s worth considering if you fit the ideal user profile described above.

Frequently Asked Questions

1. Does the APUS 190K BTU water heater work with natural gas?

No, the standard model is designed for liquid propane. A natural gas conversion kit is not included and may need to be purchased separately. Check with the seller before ordering if you need NG.

2. How many fixtures can it handle at once?

Manufacturer claims up to 3 showers + 2 faucets simultaneously. Real-world capacity depends on inlet water temperature and flow rate. In colder climates, expect about 2 showers + 1 faucet.

3. Is the Wi-Fi app easy to set up?

Yes, the Tuya Smart app is widely used. Most users report a straightforward pairing process, though occasional Bluetooth/Wi-Fi issues can occur. Follow the manual’s steps carefully.

4. Does it come with a water filter?

The unit has an inlet strainer to catch debris, but no dedicated water filter. A whole-house sediment filter is recommended for optimal performance.

5. Can this be installed indoors?

The product is labeled “outdoor tankless water heater.” While it could be installed indoors with proper venting (e.g., direct vent kit), it is not certified for indoor use by APUS. Check local codes.

6. How long does the heat exchanger last?

Oxygen-free copper is durable, and with proper maintenance (annual flushing), a 10-15 year lifespan is realistic. The 2-year warranty covers the exchanger, so longer-term reliability is unproven.

7. What is the minimum water pressure required?

The unit requires at least 15 PSI to activate, and the minimum flow of 0.79 GPM corresponds to low pressure. It can work with well water systems that have adequate pressure.

8. Does it have a vent fan? Is it loud?

Yes, it has a combustion fan. The noise level is moderate – similar to a small furnace – and should not be bothersome if mounted away from windows.

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