Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your APUS AP-AWH-Q13NG Indoor Natural Gas Tankless Water Heater. This high-performance unit delivers 95,000 BTU heating capacity with a 4.42 GPM high flow rate, featuring innovative 0.66 GPM low-flow start technology. It is designed to meet simultaneous hot water demands for multiple points of use while maintaining stable temperatures.
Image: APUS Tankless Water Heater highlighting fast heating capabilities with 95,000 BTU, 4.42 GPM maximum flow rate, and 0.66 GPM minimum start-up flow.
Features and Benefits
Powerful & High-Capacity
This tankless water heater provides 95,000 BTU heating capacity and a 4.42 GPM flow rate. It supports simultaneous hot water demands for 2 showers plus 1 sink, maintaining stable temperatures even during peak usage. The 0.66 GPM low-flow start technology ensures hot water on demand.
Image: Diagram illustrating how one APUS tankless water heater can supply hot water to multiple points in a home, including a kitchen, bathroom, and shower.
Precise & Steady Temperature Control
Equipped with high-precision sensors and smart CPU technology, this unit maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). This eliminates sudden hot/cold shocks, providing consistent comfort.
Image: A person enjoying a steady hot shower, with a graph comparing the APUS unit's stable temperature output to fluctuating temperatures of other products.
Efficient & Durable Design
Featuring oxygen-free copper heat exchangers and innovative segmented combustion technology, this tankless water heater achieves over 85% thermal efficiency. It offers up to 30% greater energy savings compared to conventional tank water heater models.
Image: Internal view of the APUS water heater's oxygen-free copper core and 3-stage burner system, highlighting its powerful and efficient components.
Compact & Space-Saving
With sleek dimensions of 20.55"H × 13.27"W × 5.91"D, this unit saves space without sacrificing performance. It operates at a quiet 40dB, making it quieter than most household appliances.
Image: The compact APUS tankless water heater installed on a wall, with dimensions and connection points for water and gas inlets/outlets clearly marked.
Safe & Reliable Operation
The unit includes multiple-layer safety protection features such as Anti-Freezing Protection, Dry Combustion Protection, Flame Failure Protection, Fan Pressure Protection, Backdraft Protection, Pressure Relief Protection, Overheat Protection, and Auto Shut-Off. It automatically shuts down if risks are detected.
Image: The APUS tankless water heater is shown with a protective shield and icons detailing its eight safety features, including flame failure, flue blockage, fan pressure, backdraft, auto shut-off, pressure relief, overheat, and anti-freeze protection.
Technical Specifications
Image: A table detailing the technical specifications of the APUS 95,000 BTU water heater, including heating capacity, gas pressure, flow rate, temperature rise, heat input, voltage, power, and connection sizes.
| Attribute | Value |
|---|---|
| Brand | APUS |
| Model Number | AP-AWH-Q13NG |
| Product Dimensions | 5.9"W x 20.55"H |
| Gas Type | Natural Gas (Indoor) |
| Heating Capacity | 95,000 BTU |
| Maximum Flow Rate | 4.42 Gallons Per Minute |
| Minimum Activation Flow | 0.66 GPM |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Voltage | 120 Volts |
| Special Features | Anti-Freezing Protection, Dry Combustion Protection, Flame Failure Protection, LED Display, Overheat Protection |
| Item Weight | 19.18 pounds |
Setup and Installation
Before beginning installation, ensure you have all necessary tools and components. Refer to the included installation guide card for precise measurements and accessory lists.
Image: The packing list for the APUS tankless water heater, detailing the water heater unit, user's manual, expanded screws, rubber seals, mounting screws, self-tapping screws, and flue pipe.
Mounting the Unit
Use the provided installation guide card as a template to mark the drilling points on the wall. Drill holes at the marked top and bottom positions. Install the M6 metal expansion screws at the top holes and mounting screws at the bottom holes. Hang the water heater vertically onto the screws, ensuring it is level and secure.
Connecting Pipes
Connect the gas inlet pipe to the gas connection on the bottom of the water heater. Ensure all connections are tight and leak-free. Wrap PTFE tape around the water inlet and outlet threads (do not use on the gas inlet) before connecting the water pipes. Connect the water inlet pipe to the cold water inlet and the water outlet pipe to the hot water outlet.
Installing the Exhaust Flue Pipe
Install the anti-downdraft device with the arrow facing up into the top exhaust port of the water heater. Secure it with self-tapping screws. Connect the flue pipe to the anti-downdraft device, ensuring it is angled downward 3°-5° for proper drainage of condensation. Secure all joints with aluminum foil tape.
Operating Instructions
The APUS tankless water heater features an intuitive LED touchscreen for easy operation. You can adjust the water temperature from 95°F to 140°F using the up and down arrows. The display also shows the current working mode and any fault codes.
Image: Close-up view of the APUS tankless water heater's clear LCD display, showing temperature settings and control buttons.
Temperature Adjustment
Press the up or down arrow buttons on the display panel to set your desired water temperature. The unit will maintain the set temperature within a tight tolerance.
Maintenance
Regular maintenance ensures optimal performance and longevity of your water heater. Check for any leaks in the gas and water connections periodically. In outdoor installations or cold climates, ensure the anti-freezing protection is active and the unit has continuous power supply to prevent damage.
Troubleshooting
Image: A Q&A section addressing common user questions about the APUS tankless water heater, including power source, exhaust pipe specifications, installation requirements, freeze protection, and residual water in pipes.
Common Issues & Solutions
- Does this run off of batteries or is it plugged in?
It works with a 120-volt wall plug. - What are the exhaust pipe specs/requirements?
Φ2.36" vent pipe and standard 1/2" NPT for water pipe and gas pipe. - Are there any installation requirements for this water heater?
It should be installed in a ventilated indoor area. - Does it have freeze protection?
The unit is equipped with an automatic heating device. Please make sure the power remains on for the protection to work properly. - Why is there some water left in the pipe connections?
The product is tested before shipping, so it is normal and will not affect the product's use.
Warranty and Support
Your APUS Tankless Water Heater comes with a 2-year coverage. For any inquiries, technical assistance, or warranty claims, please contact APUS customer support. Refer to the user manual for specific contact details or visit the official APUS website.