An adaptable system for defogging a mirror in a steamy bathroom having a tube assembly with a plurality of openings with an impeller and a plurality of heating elements for blowing hot air through the openings onto the fogged mirror. In one example embodiment, the tube assembly has louvers directing the hot air from the openings. The system has a plurality of mounting assemblies configured for all types of mirrors operative for coupling to the tube assembly, such as a portable mounting assembly with a rechargeable battery that selectively attaches on or adjacent to a mirror. The system has an articulated arm mounting assembly in one example embodiment. The system has a mounting assembly fixture in another example embodiment. A kit comprises the tube assembly and at least one mounting assembly.

A furnace for a heating, ventilation, and air conditioning (HVAC) system, comprises a burner configured to ignite a mixture of air and fuel and a sensor configured to detect a parameter indicative of an intensity of sound generated by the furnace and configured to transmit a signal indicative of a value of the parameter. The furnace further comprises a controller configured to receive the signal indicative of the value of the parameter, compare the value of the parameter to a threshold value, and in response to a determination that the value of the parameter meets or exceeds the threshold value, control operation of the furnace to adjust a flow rate of the air, a flow rate of the fuel, or both.

A monitoring system for monitoring parameters of a fluid heater is disclosed. The heater comprises a storage vessel for storing heated fluid therein. The monitoring system includes a first sensor and associated first electrical metering circuitry, a second sensor and associated second electrical metering circuitry, and a control switch. The control switch is operable to adopt a first mode of operation in which the first electrical metering circuitry is activated and a second mode of operation in which the second electrical metering circuitry is activated. The monitoring system also includes a controller for causing periodic operation of the control switch so that it switches between the first and second modes of operation.

A heater arrangement system for a water provision system for controlling a water supply provided to a water outlet, the water outlet being arranged to provide heated water to a user, the heater arrangement system comprising: a water heating device disposed remotely from the water outlet; and a control unit communicatively coupled to the water heating device, the control unit being configured to: receive a request from a user to enable a reduced temperature water supply mode, which provides for heated water to be supplied to the water outlet at a first temperature for a fixed period of time and then provides for the temperature to be lowered to a second temperature once the fixed time has elapsed; and for a user for which the request has been received, upon detecting that the user has opened the water outlet, providing heated water at the first temperature for a first period of time, then reducing the temperature of the heated water from the first temperature to a second temperature lower than the first temperature after the first period of time has elapsed.

The hot water suppliers are configured to communicate with a hot water supplier on a downstream side via the communication line connected to a first communication connector, and communicate with a hot water supplier on an upstream side via the communication line connected to a second communication connector. In each of the first communication connector and the second communication connector, a shorting pin is connected together with the communication line by installation of a cable connector, thereby detecting connection of the communication line. When detecting that the communication line is connected to the first communication connector and the communication line is not connected to the second communication connector, a controller operates to perform a function of supervisory control for cooperative control of multiple hot water suppliers communicatively connected.

A control system may be configured to learn a heating schedule at a first location according to an automated schedule learning algorithm that processes inputs including user inputs and occupancy sensing inputs and derives schedule-affecting parameters therefrom that are processed to compute the control schedule. The control system may also be configured to determine whether a thermostat has been moved to a new location, and if it is determined that the thermostat has been moved to the new location, then determine one or more parameters associated with the new location and establish a new control schedule for the new location, where zero or more of the schedule-affecting parameters are re-used based on the one or more parameters associated with the new location.

A hot water supply system that can reduce energy consumption is provided. The hot water supply system includes a liquid heater for heating a liquid, a liquid-water heat exchanger, a water-heating circuit in which the liquid is circulated between the liquid heater and the liquid-water heat exchanger, a lower outward path for leading water from a lower part of a hot water storage tank to the liquid-water heat exchanger, the upper return path for leading the water from the liquid-water heat exchanger to an upper part of the hot water storage tank, a middle outward path for leading the water from a middle part of the hot water storage tank to the liquid-water heat exchanger, a middle return path for leading the water from the liquid-water heat exchanger to a middle part of the hot water storage tank.