A water heater includes a leak detection system. The leak detection system includes a leak sensor assembly that is disposed in a bottom pan of the water heater. The leak sensor assembly includes a sensor housing that has a sensor channel that is formed therein such that the sensor channel is disposed at an elevation from a base of the bottom pan when the sensor housing is disposed on the base of the bottom pan. Further, the leak sensor assembly includes a leak sensor that is disposed in the sensor channel of the sensor housing. The leak sensor detects water that leaks from the water heater and accumulates in the bottom pan when a level of the water in the bottom pan rises to the elevation of the sensor channel and the leak sensor that is disposed therein.

A temperature control device includes a smoother including a smoothing channel through which fluid from a first inlet flows, and a first outlet from which the fluid flowed through the smoothing channel flows out, the smoother making a temperature fluctuation amount of the fluid in the first outlet smaller than that in the first inlet, a thermoregulator including a second inlet into which the fluid from the first outlet flows, a thermoregulating channel through which the fluid from the second inlet flows, a thermoregulating unit regulating a temperature of the fluid flowing through the thermoregulating channel, and a second outlet from which the fluid flowed through the thermoregulating channel flows out, calculating a temperature regulation amount of the thermoregulating unit, based on temperature of the fluid in the smoothing channel, and calculating the temperature regulation amount, based on temperature of the fluid at a position downstream of the second outlet.

A temperature control device includes a smoother including a smoothing channel through which fluid from a first inlet flows, and a first outlet from which the fluid flowed through the smoothing channel flows out, the smoother making a temperature fluctuation amount of the fluid in the first outlet smaller than that in the first inlet, a thermoregulator including a second inlet into which the fluid from the first outlet flows, a thermoregulating channel through which the fluid from the second inlet flows, a thermoregulating unit regulating a temperature of the fluid flowing through the thermoregulating channel, and a second outlet from which the fluid flowed through the thermoregulating channel flows out, calculating a temperature regulation amount of the thermoregulating unit, based on temperature of the fluid in the smoothing channel, and calculating the temperature regulation amount, based on temperature of the fluid at a position downstream of the second outlet.

A temperature controller is provided, which includes a first temperature sensor, a heater, a logic circuit, a watchdog circuit and a second temperature sensor. The first temperature sensor may detect the environmental temperature. The heater may be turned on after the temperature controller is turned on. The logic circuit may turn on the watchdog circuit after the environmental temperature is higher than the first temperature for the watchdog circuit to keep detecting whether the main circuit of an electronic device is turned on until the main circuit is turned on. The second temperature sensor may be turned on after the main circuit is turned on and then detect the environmental temperature. The logic circuit may turn off the heater after the second temperature sensor detects the environmental temperature is higher than a second temperature, or turn on the heater when the environmental temperature is lower than a third temperature.

A system and method for controlling a boiler comprising a microcomputer operatively connected to a microcontroller wherein the microcontroller is configured to provide flame safeguard operations and the microcomputer is configured to provide operating control instructions to the microcontroller. The boiler control system may operate either in a stand-alone, cascade master or cascade slave configuration.

The present description discloses a combustion type water heater that heats water by burning fuel. The combustion type water heater includes: a burner that generates combustion gas by burning the fuel; a heat exchanger that exchanges heat between the water passing through on an inside of the heat exchanger and the combustion gas flowing on an outside of the heat exchanger, an exhaust pipe that discharges the combustion gas after the heat exchange in the heat exchanger as exhaust gas; an exhaust gas temperature detector that detects a temperature of the exhaust gas flowing in the exhaust pipe as an exhaust gas temperature; a clog degree detector that detects a degree of clog in the exhaust pipe; and a scale buildup determiner that determines whether or not scale has built up inside the heat exchanger based on the exhaust gas temperature and the degree of clog in the exhaust pipe.

A system includes a cold water supply, a water heater, a mixing valve, and one or more water use fixtures. The water heater includes a tank, a first temperature sensor configured to output a first temperature signal indicative of a water temperature of water in the tank, a heating device, and a water heater controller configured to control the water heater based on the first temperature signal and an operating temperature setting. The mixing valve outputs a mixed water flow, which is a combination of a hot water flow and a cold water flow, to the water use fixtures. A second temperature sensor outputs a second temperature signal indicative of a water flow temperature of the mixed water flow or the hot water flow, and a system controller selectively deactivates the water heater based on the second temperature signal.

A heat exchanger according to the present disclosure includes a plurality of tubes through which heating water flows, a housing having an interior space in which the plurality of tubes are disposed and through which a combustion gas passes, the housing including a plurality of flow passage caps connected with distal ends of the plurality of tubes to cause the heating water to flow through the flow passage caps, a temperature sensor brought into close contact with an area between two flow passage caps adjacent to each other among the plurality of flow passage caps to obtain a temperature, and a bracket coupled to the housing to bring the temperature sensor into close contact with the area between the adjacent two flow passage caps.

A demand based control for a hydronic heating system varies the heat response based on an actual demand of the conditioned space, rather than an estimated thermal loss. Differences between supply and return of a heat transfer medium, such as forced hot water, are measured for the conditioned space, as well as the flow rate of the forced water to determine an actual thermal transfer to the conditioned space. A required heat generation is computed based on the measured transfer and resultant temperature change of the conditioned space, and heat generation parameters such as boiler firing rate and circulator pump speed varied to control the heat transfer to the conditioned space and avoid overshoot or excessive heat generation beyond that needed for the measured demand.

An apparatus includes a high-pressure tank, a controller, a valve, controlled by the controller, and a heater.