Storage hot water systems are large tanks of hot water.
As hot water is used from the top, it is replaced by cold water at the bottom.
Since heat rises, there is little mixing of the hot and cold water. When supply is low, water from the storage systems usually changes quickly from hot to cold.
The system is easy to distinguish as it is the only type with a water pipe connected at the bottom of the unit.
Electric heat pumps can be connected to controlled tariff 9000 or 9100 as specified in Queensland.
You should speak with the manufacturer or installer for further information about which tariff would be most suitable for your particular model.
Water is heated as it is used by passing through copper coils immersed in a bath of hot water.
The bath of water is heated by the unit’s heating element. Because this bath of water is at room pressure and vented to the atmosphere, the level may drop due to evaporation and steam being vented out of the overflow pipe.
When the level drops, you may experience a gradual change to cold water after a short period of hot water.
The solar system is also a storage unit. The tank is generally located above the collector, as heat rises and causes the water to circulate.
Most are fitted with a booster element controlled by a thermostat exactly the same as an electric storage unit.
Some are also fitted with external switches, which can control power to an element.
These boosters can be attached to a controlled tariff at your request through an electricity retailer.
There are a number of reasons you may experience cold water at your property. The common causes of cold water are:
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