What is the most appropriate remedy if extremely hot water is discharging from an open vented hot water storage system?

When extremely hot water is discharging from an open vented hot water storage system, the most appropriate remedy is to replace the immersion heater with a dual thermostat immersion heater.

In a hot water storage system, the immersion heater is responsible for maintaining the temperature of the water in the tank. A dual thermostat system is designed to provide better control over the heating cycle and can help prevent overheating. The primary thermostat regulates the main heating function, while the secondary thermostat usually serves as a safety measure to prevent the temperature from exceeding set limits. This setup reduces the risk of excessive heat buildup and minimizes the chance of scalding or damage from overheated water.

In contrast, a single thermostat immersion heater may not provide sufficient control and could lead to situations where the water temperature might rise excessively due to lack of regulation. Installing a temperature relief valve can be beneficial in protecting against overpressure and temperature in the system, but it does not address the underlying cause of the overheating. Increasing the water storage capacity would not address the issue of hot water discharge; it may even exacerbate the situation by allowing more water to reach high temperatures.

Therefore, replacing the immersion heater with a dual thermostat immersion heater is the most effective way to manage the temperature and ensure safe operation of the