then 120°F. This is the water temperature setpoint. To raise or lower this temperature setpoint, press the 
to be displayed, and releasing the MODE pushbutton will cause 10°F to be displayed. This is the differential setpoint, a setpoint that determines how many degrees the water temperature is allowed to drop before the water heater activates. To change between the available 10°F and 5°F settings, press and release the 
to be displayed, and releasing the MODE pushbutton will cause 0°F to be displayed. This is the post purge setpoint, a setpoint that allows the boiler to be shut off when the actual water temperature is a certain number of degrees below the setpoint temperature. Since the circulator continues to run, the post purge feature will remove excess heat from the boiler after the boiler shuts off. To change the post purge setpoint, press and release the 
to be displayed, and releasing the MODE pushbutton will cause ‘41’ to be displayed. This is the tank volume in gallons. To change this volume, press and release the 
to be displayed, and releasing the MODE pushbutton will cause a number to be displayed. This is a BTU heat transfer rate estimate in MBH. This is a diagnostic readout and cannot be changed.
. Thereafter, these changes will be the new control settings even in the event of a power outage.
message indicates an unplugged or
message appears when the stored water temperature exceeds 155°F. Contact your service person to correct the problem. An Er3 message indicates that the actual domestic water temperature did not reach the setpoint temperature after one hour of attempted heating. Contact your service person to correct the problem. For models equipped with a water sensor, an Er4 message indicates that a water puddle has been detected. Contact your service person to correct the problem.RTR, Top Down, WH-7 Classic Series, WH-9 Classic Series specifications
Amtrol is a well-respected name in the water heater industry, and its Classic Series models, such as the WH-9 and WH-7, are recognized for their quality and performance. These water heaters are designed to meet the hot water needs of residential and commercial applications, offering efficient solutions for those who require a reliable supply of hot water.The WH-9 Classic Series is a standout model, boasting a 9-gallon capacity, making it ideal for smaller households or specific applications that require a compact solution. This model is designed with a unique top-down heating system, which ensures that water is heated efficiently from the top down, minimizing energy waste. The tank is insulated with high-density foam, reducing standby heat loss and enhancing energy efficiency. This model features a glass-lined steel tank that is resistant to corrosion, coupled with a magnesium anode rod that further extends the tank’s lifespan.
On the other hand, the WH-7 Classic Series offers a slightly smaller 7-gallon capacity, making it a perfect choice for tight spaces or systems where only a limited quantity of hot water is needed. Similar to the WH-9, the WH-7 also utilizes advanced insulation technology to maintain water temperature and reduce energy consumption. The compact design of both models allows for easy installation in various locations within a home or business.
Both the WH-9 and WH-7 feature a user-friendly thermostat for precise temperature control. This allows users to adjust the water temperature to their specific needs, ensuring optimal comfort and safety. The Classic Series is built with high-quality components, including durable heating elements that provide quick recovery times, delivering a steady flow of hot water when needed.
Another notable characteristic of the Amtrol Classic Series is its commitment to sustainability. The company integrates eco-friendly technologies into their products to reduce energy consumption, which is beneficial for both the environment and the consumer’s utility bills.
In conclusion, Amtrol’s WH-9 and WH-7 Classic Series water heaters offer efficient, reliable hot water solutions for varying residential and commercial needs. With their innovative heating technologies, durable construction, and user-friendly features, these models stand out in the competitive water heater market, making them a preferred choice for many homeowners and businesses alike. Whether you opt for the 9-gallon or the 7-gallon capacity, you can be confident in receiving consistent and efficient hot water when you need it most.