But the lower one detects any change in the temperature of the water. Turn the power to the hot water heater off by tripping the relevant breaker switch on your home's electrical fuse box. The thermostat on top acts as the primary one while having a high limit switch. When you turn on a hot water faucet, cold water enters the bottom of the tank through the dip tube. It will stop working if the temperature of the water goes above 170 F. You can also reset your settings using this button. If you have a gas, oil or LPG central heating system, your full set of controls should ideally include a boiler thermostat, a timer or programmer, a room thermostat and thermostatic radiator valves (TRVs). It controls the temperature of the water from your hot water taps. An electric heater with a storage tank of at least 30 gallons comes with two heating elements with a thermostat on each of them. Electric storage tank type hot water heaters are often fitted with two thermostats -- one at the top, and one at the bottom of the tank. What does it do? Additionally, most thermostats are not accurate enough to maintain a steady water temperature; it rises and falls with usage. Water heater thermostats are connected directly to the hot water tank. The high limit switch that is located near the upper thermostat is used to protect the water heater from overheating. (Storing hot water … Which means, the choice is hot setting. That means that the water at the top of the storage tank, where the delivery outlet is located, could actually be hotter than the set temperature. Is there any tip for maintaining a water heater? Then the lower element heats the rest of the tank until until it reaches its limit and both are off. Smelly Hot Water See the section on 'Cooling Down a Hot Water Tank' in the article ' Shutting Down an Electric Water Heater ' for information on lowering the water temperature in the tank. This is a cylinder thermostat. Cylinder thermostats are normally set to about 60C. They should both be set to the same temperature. Temperature setting. Again, if you want a safe setting, you should choose a setting which has temperature at 120 degrees. Other temperature settings, hot and very hot, each stands for 120 degrees and 160 degrees. Set your thermostat. You will find it strapped around your hot water tank in your airing cupboard. This should NOT be placed over the thermostat or the wiring. Electric water heaters often have two thermostats -- one at the top and another at the bottom of the tank. If you feel it is too hot, adjust the thermostat to your desired temperature. Thus saving electricity and wasted heat/loss from heating the whole store. The tank will likely be hot. As we already mentioned, avoid setting the temperature any higher than 125 degrees, since doing so will put you at risk of burn injuries. The recommended setting for this control is 60°C/140°F. My reason for this is the upper part of the tank is always hottest, and depending on the demand for hot water tank size the upper half of the tank would be enough to provide reasonable hot water supply. Your water heater thermostat should be set to 125 degrees Fahrenheit. Water Temperature Too Hot Or Too Cold. Above this the water will be dangerously hot, and below this, bacteria may grow in the cylinder and become a health hazard. Assume that both thermostats are equal and the tank has reached equilibrium at 140 degrees. In order to set the temperature of outlet water, you need to set both thermostats on similar temperatures. Electrical fuse box home 's electrical fuse box, cold water enters the bottom of the water heater overheating! 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