A hot water supply device including an inlet pipe, an outlet pipe, a burner unit, a heat exchanger, an exhaust aperture, a first temperature sensor detecting a measured exhaust temperature of the exhaust gas, a second temperature sensor detecting a water temperature of water entering the inlet pipe, and a processor. The processor is configured to obtain an error between the measured exhaust temperature and an estimated exhaust temperature, and detects that scale clogging has occurred inside the heat exchange tubing based on an index which is generated using the error between the measured exhaust temperature and the estimated exhaust temperature. The estimated exhaust temperature is a first predetermined value that is determined using a numerical equation which has at least the water temperature of water entering the inlet pipe and a scale number of the hot water supply device as variables of the numerical equation.

A manifoldhead and expansion tank combination is provided. The manifoldhead comprises an outer housing having an inlet channel and an opposed outlet channel extending laterally from the manifoldhead and a connection means, surrounding a third opening from the outer housing, for sealably connecting the manifoldhead to the to the expansion tank. The manifoldhead further includes, secured internally within the outer housing, a baffle plate extending longitudinally within the manifoldhead and having an opening extending through the baffle plate, the opening being preferably aligned with the inlet and outlet channels. The baffle plate extending into AND through the third opening to continue to separate the flow moving through the entire expansion tank into inlet and outlet flows, entering and leaving the third opening. There is also preferably provided another set of baffles extending across the third opening limiting the inlet and outlet flows through the expansion tank. There are also provided recirculation systems for potable water that include a manifoldheaded expansion tank for providing both cool and heated potable water to a building where people live or work.

A fluid heating system including a fluid supply subsystem having a fluid heating device, a fluid output subsystem, and an intermediary fluid device. The fluid heating system also includes a control device for the fluid supply subsystem, a first temperature sensor, a second temperature sensor, and a control circuit coupled to the control device. The control device is configured to control one selected from a group consisting of the fluid heating device and an amount of water input to the intermediary fluid device. The first and second temperature sensors are configured to output first and second temperature signals, respectively. The control circuit is configured to generate a first control signal based on the second temperature signal, determine a multiplier, generate a second control signal based on the first temperature signal, and send a main control signal to the control device based on the first and second control signals.

A method for starting up a hot ultrapure water production system that produces hot ultrapure water by heating ultrapure water to a supply water temperature, for supplied to a point of use, the method involving: alternately passing heated water and cooled water through a hot ultrapure water pipe through which the hot ultrapure water flows, the heated water being obtained by heating the ultrapure water to a temperature higher than room temperature and the cooled water being obtained by cooling the ultrapure water to a temperature lower than the temperature of the heated water in a range of from room temperature to the supply water temperature.

A hot water supply system includes a hot water supply device which can be connected to an external communication network via a communication repeater, and a server. The server obtains, in pairing processing of associating a mobile terminal device which can remotely control the hot water supply device with the hot water supply device, identification information of a communication repeater to which the mobile terminal device is connected, and stores the identification information along with pairing information. Besides, the server performs control to determine conditions of the remote control based on whether the identification information of the communication repeater stored in association with the hot water supply device being a remote operation destination matches identification information of the communication repeater received from the mobile terminal device in the communication, when the communication of the remote control is received from the mobile terminal device.

A water heating apparatus is provided. The water heating apparatus includes a pump and is configured to be able to set a hot-water circulation route to circulate hot water discharged from a heat exchanger to be re-entered into the heat exchanger by operation of the pump. When a state of a hot-water supply operation in which a burner drives combustion is changed to an end state, hot water in the heat exchanger is circulated in the hot-water circulation route to suppress deposition of scale.

An apparatus and method for heating water using tankless water heater with improved rain cap.

A thermostatic device for a pipeline of a sanitary water supply or dispensing system and including a temperature meter which detects the temperature of the sanitary water entering the thermostatic device, a flow regulator which regulates a rate of sanitary water exiting from the device, and a control unit. The flow regulator operates in a first operating mode and a second operating mode. The first operating mode is a steady-state operating mode. The second operating mode is a steady-state setting operating mode in which the flow rate of sanitary water leaving the thermostatic device is a minimum flow rate. The control unit is configured to acquire, receive and/or calculate a reference temperature and arrange the switching of the operating mode when the temperature meter detects a temperature of the sanitary water greater than the reference temperature.

A tankless water heater and manifold system is provided. The system includes a self-contained unit for providing hot water distribution throughout the system. The unit includes a tankless water heater having a hot water outlet pipe with outlet ports that function as a built-in manifold for distributing water directly from the unit through hot water lines that connect each plumbing fixture in the system directly to the unit.

The present invention provides an energy storage system (10) for a use with a boiler (20). The energy storage system (10) comprises a plurality of thermal energy storage banks (101, 102, 103, 104). Each thermal energy storage bank (101, 102, 103, 104) comprises phase changeable material having a predetermined phase transformation temperature. The energy storage system (10) also includes an extraction device (105; 1 15) configured to recover waste energy from the boiler (20). The extraction device (105, 1 15) is operable to extract waste energy from the boiler (20) and feed that energy to at least one (101) of the thermal energy storage banks (101, 102, 103, 104). A controller (106) is arranged, in use, to activate the extraction device (105, 115) in response to operation of the boiler (20).