Final answer:
The high temperature cutoff for residential water heaters can vary depending on factors such as the power rating of the heater and safety regulations. It is important to choose a heater that can maintain the desired temperature without exceeding the circuit or safety limits.
Step-by-step explanation:
The high temperature cutoff for residential water heaters depends on various factors such as the power rating of the heater and the desired temperature inside the house. In the provided examples, a house requiring 100 W/°C and equipped with a 10,000 W (10 kW) heater can support a temperature difference (AT) as high as 100°C. However, a poorly built house with a heater rating of 6,000 W can only maintain a temperature difference of 33°C at full-blast.
It's important to note that safety regulations limit the continuous use to 80% of the breaker current capacity. Therefore, the limits for heating appliances are typically around 1,500 W to 1,920 W. This ensures the circuit and safety limits are not exceeded.
In summary, the high temperature cutoff for residential water heaters can vary depending on the specific circumstances, but it is recommended to have a heater that can maintain the desired temperature without exceeding the circuit or safety limits.