APUS Tankless Water Heater Review: Pros & Cons Verdict

Introduction

If you’re in the market for a reliable propane tankless water heater that can handle the demands of a busy household, the APUS 190,000 BTU Outdoor Tankless Water Heater is a model worth considering. With an 8.1 GPM flow rate, WiFi and remote control, and a compact design, it promises whole‑home hot water on demand. This APUS tankless water heater review takes a detailed look at the manufacturer’s claims, key features, and realistic performance expectations to help you decide if this unit fits your home.

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

The APUS 190,000 BTU tankless water heater is an outdoor, propane‑powered instant hot water system designed for whole‑house use. According to the manufacturer, it can supply up to three showers and two faucets simultaneously, making it suitable for medium to large households. It features smart temperature control via the Tuya app or a wired remote, a 100% oxygen‑free copper heat exchanger, and wind‑resistant construction for all‑weather operation. The unit is wall‑mountable and measures 22.48 × 15.51 × 6.54 inches, saving indoor space while delivering on‑demand hot water.

Key Features & Specifications

Below is a breakdown of the most important features and specifications for the APUS propane tankless water heater.

The unit also includes smart seasonal technology, multi‑point hot water supply, and a low water pressure startup. All safety protections (freeze, overheat, flame failure) are built in. The manufacturer offers a 2‑year full warranty on all components.

What’s Included in the Box

According to the product listing, the box contains:

• 1 x Tankless Water Heater (model AP‑AWH‑W26LPG)
• 1 x Installation and Owner’s Manual
• 1 x Wired Controller (optional) with cable
• Screws and anchors for mounting: 2 controller screws, 2 closed‑circuit terminals, 1 expandable screw, 6 wall anchors, 4 mounting screws

Setup requires standard plumbing and gas connections (3/4 inch NPT). No additional accessories like a gas shut‑off valve or venting kit are included, so you’ll need to source those separately. The unit is designed for outdoor installation, so indoor venting is not needed.

How to Use

Setup

Installing the APUS tankless water heater involves mounting it on a suitable exterior wall, connecting the propane gas line, cold water inlet, hot water outlet, and a 120V AC power source. Because this is a propane appliance, we strongly recommend hiring a licensed professional for gas connections and electrical work. The manual provides step‑by‑step instructions, but local building codes may also require permits.

Operation

Once installed and powered, the water heater is ready to use. Turn on any hot water faucet, and the unit will ignite automatically when flow exceeds 0.79 GPM. You can adjust temperature from the wired controller or via the Tuya app on your smartphone. The app allows remote temperature changes and status monitoring. The manufacturer claims a stable output with ±1°F accuracy.

Maintenance

Regular maintenance includes cleaning the inlet water filter (typically every 3–6 months, depending on water quality), checking for gas leaks, and inspecting the vent area for obstructions. The oxygen‑free copper heat exchanger is designed to resist corrosion, but periodic flushing with a descaling solution may be necessary if you have hard water. Always refer to the owner’s manual for specific maintenance intervals.

Troubleshooting

Common issues may include failure to ignite (check gas supply, power, and water flow), fluctuating temperatures (adjust gas pressure or clean the filter), or error codes on the display. The manual provides a troubleshooting chart. If problems persist, contact APUS customer support under the 2‑year warranty.

Performance & User Experience

The APUS 190,000 BTU unit is designed to meet the hot water demands of a typical 3‑4 bedroom home. With an 8.1 GPM flow rate at a 35°F rise (common for northern climates), it can handle multiple simultaneous uses—for example, two showers and a dishwasher. The manufacturer claims it can support “3 showers + 2 faucets,” which is an aggressive estimate; performance will vary based on incoming water temperature, pipe runs, and gas pressure.

The ultra‑low minimum activation flow of 0.79 GPM is a notable feature. It means the heater can kick on even with low water pressure (common in rural or older homes) and won’t short‑cycle when using small‑flow fixtures like a utility sink.

The smart control via the Tuya app works well for many users, allowing quick temperature adjustments from anywhere. The wired remote is convenient for mounting inside the house near a bathroom or kitchen.

Customer reviews on Amazon (4.3 out of 5 stars from 42 ratings) are generally positive, with many praising the compact size, easy installation, and consistent hot water. Some users note that the unit can be loud under heavy draw, and others mention the need for a high‑quality propane regulator to avoid pressure drops. As with any tankless heater, annual maintenance is important to prevent mineral buildup.

Pros and Cons

Pros

• High BTU output (190,000) suitable for whole‑house use in moderate climates.
• Low minimum flow rate (0.79 GPM) works well with weak water pressure.
• Smart app control and wired remote provide flexibility.
• Compact outdoor design saves indoor space.
• Oxygen‑free copper heat exchanger claimed to be durable and efficient.
• 2‑year warranty on parts and components.

Cons

• Propane model only; not convertible to natural gas out of the box (separate NG versions exist).
• Requires 120V electrical connection—may need an outdoor outlet.
• Some users report noise during operation.
• Installation and setup should be done by a professional for safety.
• Flow rate may drop in very cold climates (incoming water below 40°F).
• Limited customer reviews (42 at time of writing) – long‑term reliability is still being established.

Comparison With Alternatives

Here’s how the APUS 190,000 BTU tankless water heater stacks up against two other popular propane tankless models. (Note: All specifications are based on manufacturer data; actual performance depends on installation and usage.)

The APUS offers a lower price point (based on typical market pricing, though we avoid listing exact numbers here) compared to Rinnai, but with a shorter warranty. The EcoSmart ECO 27 is electric, which may be less powerful for whole‑house use but ideal if you don’t have a gas line.

Who Should Buy This Product?

Ideal for:

• Homeowners with an existing propane gas line looking for a whole‑house tankless upgrade.
• Those needing a compact outdoor unit that doesn’t occupy indoor space.
• Users with low water pressure (minimum 0.79 GPM activation helps improve reliability).
• People who want smart home integration (Tuya app) for remote temperature control.
• Households in moderate climates where incoming water temperature rarely drops below 40°F.

Not ideal for:

• Homes that need a natural gas version (separate model required).
• Very cold climates (northern US/Canada) where a 35°F rise may not be sufficient for multiple simultaneous uses.
• Users who want an indoor unit with direct venting (the APUS is designed for outdoor installation only).
• Those who prefer a longer warranty period from a well‑established brand (Rinnai, Rheem, etc.).

Expert Tips

• Match the BTU to your climate: Use a tankless sizing calculator (like the one from the Department of Energy) to confirm that 190,000 BTU at 8.1 GPM is sufficient for your home’s peak demand.
• Install a high‑quality propane regulator: Inconsistent gas pressure can cause flame fluctuations. A two‑stage regulator helps maintain steady output.
• Use a water softener or whole‑house filter: Hard water can accelerate mineral buildup in the heat exchanger. A pre‑filter prolongs the unit’s life.
• Mount the controller in a convenient location: Even though the app works well, a wired remote near the shower or kitchen gives quick manual control.
• Schedule annual descaling: This is critical for any tankless heater, especially if you have hard water. Use a vinegar or citric acid flush.

Common Mistakes

1. Skipping professional installation: Propane gas connections, electrical work, and proper venting (for indoor models) should always be handled by a licensed professional.
2. Undersizing the gas line: A 190,000 BTU unit requires a properly sized propane line (often 1/2” or 3/4” depending on length). Failure to do so leads to inadequate flow and poor performance.
3. Not accounting for basement or attic locations: While this unit is meant for outdoor use, some installers try to place it indoors without proper venting. Always follow the outdoor‑only designation unless you buy an indoor model.
4. Ignoring the manual’s flow rate requirements: Using very low‑flow fixtures (less than 0.79 GPM) will prevent the heater from turning on. Make sure your faucets and showerheads meet the minimum.
5. Neglecting to clean the inlet filter: Debris in the water line can clog the filter and cause the heater to shut down. Clean it every 3 months.
6. Not installing a pressure relief valve (PRV): If your incoming water pressure exceeds 80 psi, a PRV is essential to protect the heat exchanger.
7. Assuming the app is mandatory: The unit works perfectly without WiFi; the wired remote is sufficient for most users.

Where to Buy

The APUS 190,000 BTU tankless water heater is available on Amazon and through select online retailers. For the most current availability, warranty details, and customer reviews, check the official product page.

Final Verdict

The APUS tankless water heater review shows a well‑specified propane unit that delivers solid performance for the price. Its high 190,000 BTU output, smart app control, and low flow activation make it a strong candidate for homeowners seeking an outdoor tankless solution. While the warranty is shorter than some competitors and long‑term reliability data is limited, the initial customer feedback is positive. If you have a propane supply and need a whole‑house instant water heater that won’t break the bank, the APUS 8.1 GPM model is worth serious consideration.

For those in very cold climates or who prioritize extended warranty coverage, exploring options like Rinnai or Rheem may be prudent. However, for the average household in a moderate climate, the APUS delivers on its promise of on‑demand hot water with modern smart features.

Frequently Asked Questions (FAQ)

Is the APUS tankless water heater worth buying?

Based on the specs and user feedback, it appears to be a good value for a propane whole‑house unit, especially if you want smart controls and a compact outdoor design. However, always verify that your gas line and water pressure meet the requirements.

Can this water heater be used indoors?

No. The manufacturer specifies this model is for outdoor installation only. It is not designed with a venting system for indoor use.

Does the unit work with natural gas?

The model reviewed (AP‑AWH‑W26LPG) is propane only. APUS also makes natural gas versions (e.g., 190,000 BTU NG model) – check the product number before purchasing.

How many bathrooms can it support?

The manufacturer claims it can supply 3 showers and 2 faucets simultaneously. Realistically, in a moderate climate with a 35°F rise, you can expect around 2–3 showers at once if other demands are minimal.

What is the minimum water pressure required?

The unit activates at a low 0.79 GPM, which is equivalent to about 10–15 psi, depending on pipe size. It is designed for low‑pressure situations.

How do I connect the unit to the Tuya app?

Download the Tuya Smart or Smart Life app, create an account, put the water heater into pairing mode (see manual), and follow the in‑app instructions to connect over 2.4 GHz WiFi.

Is a permit required for installation?

Most local building codes require a permit for gas and plumbing work. A licensed professional will know the requirements in your area.

What happens if the power goes out?

Since the heater uses a 120V AC control board, it will not operate during a power outage. You will have no hot water until power is restored.

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