Water heating system and device

A heating system according to any preceding claim, wherein the controller is configured to determine a quantity of heat above a temperature threshold in the lower portion of the water tank and/or the upper portion of the water tank, preferably in dependence on a temperature distribution in the water tank.

A heating system according to any preceding claim, wherein the controller is configured to determine that a temperature of the upper portion of the tank is below a threshold;

• and cause the selector arrangement to direct heat to the upper heat transfer means.

A heating system according to any preceding claim, wherein the controller is configured to determine that a temperature of the upper portion of the tank is above a first threshold;

• determine that a temperature of the lower portion of the tank is below a second threshold;
• determine that the heat pump is in the on state;
• and cause the selector arrangement to direct heat to the lower heat transfer means.

A heating system according to any preceding claim, wherein the controller is configured to determine that the heat pump requires a defrost cycle;

• determine that a quantity of heat above a temperature threshold in the lower portion of the water tank is above a threshold;
• and cause the selector arrangement to draw heat from the lower heat transfer means.

A heating system according to any preceding claim, wherein the controller is configured to determine that a request for sterilization of the water tank has been received;

• and cause the selector arrangement to direct heat to the lower heat transfer means.

A heating system according to any preceding claim, wherein:

• the upper heat transfer means is an upper heat transfer coil configured to transfer heat between the heat transfer fluid and the upper portion of the water tank;
• the lower heat transfer means is a lower heat transfer coil configured to transfer heat between the heat transfer fluid and a lower portion of the water tank;
• and the selector arrangement is a valve arrangement in the circuit of heat transfer fluid arranged to route the heat transfer fluid to the upper heat transfer coil or the lower heat transfer coil or to both.

A heating system according to any preceding claim, further comprising a space heating system.

A heating system according to any preceding claim, wherein the water tank further comprises a destratification pump, wherein the destratification pump transfers water between the upper portion of the water tank and the lower portion of the water tank.

A heating system according to any preceding claim, wherein the water tank comprises at least one baffle.

A heating system according to any preceding claim, wherein the water tank comprises at least one electric heating element.

A heating system according to any preceding claim, wherein the water tank is for storing hot water at ambient pressure or for storing pressurized hot water, optionally potable water or mains pressurized water or water for supply to a user.

A controller for use in a heating system, optionally according to any preceding claim, the controller configured to control heat transfer to or from an upper portion of a water tank or a lower portion of the water tank or both in dependence on a temperature distribution in the water tank.

A water tank comprising a baffle, wherein the baffle divides the water tank into an upper portion and a lower portion, such that the upper portion of the heat tank and the lower portion of the heat tank may be held at different temperatures.

A heating system including:

• a water tank for storing hot water;
• a space heating system comprising a circuit of heat transfer fluid and a heat exchange means for receiving heat from the water tank;
• and a controller configured to control the transfer of heat from the water tank to the heat exchange means for dynamic adjustment of a target temperature of heat transfer fluid in the space heating system.

A method for controlling a heating system comprising selection of heat transfer to or from an upper portion of a water tank or a lower portion of the water tank or both, preferably in dependence on a temperature distribution in the water tank.

A method of operating a heating system, the method comprising:

• determining a temperature distribution in a water tank for storing hot water;
• and
• controlling a destratification pump arranged to pump fluid from an upper portion of the water tank to a lower portion of the water tank in dependence on a temperature distribution in the water tank.