The Upgraded 9815WH In-Wall Heater by ZHONTIN is designed to be a perfect replacement for the broan-nutone 9815WH model, offering a blend of efficiency and style. With dimensions of 10.5 x 12.5 x 3.37 inches for the wall can and an elegant white panel size of 11.56 x 14.75 x 0.6 inches, this heater is suitable for various rooms including bedrooms, living rooms, and bathrooms.

One of the standout features is its fast heating capability. Equipped with a large silent crossflow fan and a 1500W nickel chrome heating element, it can warm up a well-insulated room of about 120 sq ft to a comfortable temperature in less than 10 minutes, all while operating at less than 22 decibels to ensure your sleep remains undisturbed.

Safety and reliability are paramount with this heater. It includes a permanently lubricated motor, an efficient silent fan, a stable thermostat, and a high-temperature safety shut-off device. The adjustable thermostat adds to its user-friendliness, making it easy for everyone in the household to control the heat output.

However, some users have reported issues such as receiving pre-installed units missing parts like the wall mount metal box, non-functional heaters upon arrival, and poorly fitting knobs that do not align flush with the unit. Additionally, there have been instances where repairs were necessary due to disconnected wires.

Despite these concerns, ZHONTIN offers comprehensive support including detailed installation manuals and one-year service support with responsive customer service available via email for any queries or issues.

In conclusion, while the Upgraded 9815WH In-Wall Heater boasts impressive features like rapid heating and safety mechanisms along with aesthetic design benefits; potential buyers should be aware of possible quality control issues based on user feedback before making their purchase decision.