A gas-fired appliance includes a tank configured to store a fluid to be heated, a powered anode extending into the tank and configured to generate an electric anode current, and a combustion chamber including a burner configured to generate products of combustion. The appliance also includes an exhaust structure, a heat exchanger, and an electronic processor coupled to the powered anode. The products of combustion flow from the combustion chamber to the exhaust structure via the heat exchanger. The electronic processor is configured to determine a duty cycle of the burner, determine whether the duty cycle of the burner exceeds a predetermined threshold, increase a magnitude of a protection parameter of the powered anode from a first value to a second value when the duty cycle of the burner exceeds the predetermined threshold, and control the powered anode according to the second value of the protection parameter.

Appliances, such as hot water heaters, hot water heater controllers, and methods of operating such hot water heaters, that take into consideration the availability and capacity of alternative energy sources so that additional efficiencies can be realized by sensing the availability of an alternative energy source and adjusting the control algorithms used to control the use of the available electric power is provided.

An intake air heating system for a vehicle includes: an air heater configured to heat air an intake system of an engine; an air heater control module configured to selectively apply power to the air heater via a power conductor; and a voltage sensor and communication module configured to: measure a voltage on terminals of the air heater; and transmit an indicator of the voltage to the air heater control module on the power conductor, where the air heater control module is further configured to: receive the indicator via the power conductor; determine a resistance of the air heater based on the voltage on the terminals of the air heater and a current through the air heater; and apply power to the air heater based on the resistance of the air heater.

An intake air heating system for a vehicle includes: an air heater configured to heat air an intake system of an engine; an air heater control module configured to selectively apply power to the air heater via a power conductor; and a voltage sensor and communication module configured to: measure a voltage on terminals of the air heater; and transmit an indicator of the voltage to the air heater control module on the power conductor, where the air heater control module is further configured to: receive the indicator via the power conductor; determine a resistance of the air heater based on the voltage on the terminals of the air heater and a current through the air heater; and apply power to the air heater based on the resistance of the air heater.

A vehicle air-conditioner safety device includes a controller which, in a case in which an abnormality has occurred in a heating device that heats coolant with a heater, determines whether or not the abnormality is a restorable abnormality or a non-restorable abnormality. When the abnormality is determined to be the restorable abnormality, it is determined whether or not the restorable abnormality has been removed. Heating by the heater is prohibited when the restorable abnormality or the non-restorable abnormality has occurred. Heating by the heater is restored when the restorable abnormality has been removed after heating by the heater is prohibited due to occurrence of the restorable abnormality.

The present disclosure discloses an ignition temperature control apparatus of a gas water heater, comprising: a heat exchanger made of stainless steel; a combustion device which supplies high-temperature flue gas to the heat exchanger; a water passage communicated with the heat exchanger; a first temperature detection device provided on the heat exchanger or on the water passage; a controller, wherein if a temperature detected by the first temperature detection device is lower than or equal to a first preset temperature or a rate of decline of a temperature detected by the first temperature detection device is higher than or equal to a first preset value the controller controls the combustion device to operate in such a state that a requirement for thermal bearing capacity of the heat exchanger made of stainless steel is satisfied. The heat exchanger of the ignition temperature control apparatus of the gas water heater of the present disclosure, which is made of stainless steel, has good thermal inertia and excellent thermal insulation properties, and thus the combustion device is started for heating when the ignition temperature control apparatus of the gas water heater is in a stop state, such that it is possible to ensure that the heat exchanger will not fail while an anti-freezing effect can be achieved.

An on-demand hot water dispenser includes a housing, a water heating system received in the housing, and a faucet connected to the water heating system through the housing for dispensing hot water into a container. A drip tray is positioned below the faucet and a screen covers the drip tray to support the container during dispensing of the hot water.

An apparatus and system for a combination space and water heater including a controller device and a method for control. The controller device is a self-contained system that can be added to, or in combination with, existing water heaters and hydronic air heating systems using standard plumbing connections, and provides a potable water system without any need of an intermediary heat exchanger. The controller device automatically monitors a heating capacity of the water heater and the hydronic heating coil over time, and correlates measured heating loads with one or more environmental temperatures, thermostats, user settings, and/or a supplemental heating system.

A temperature control equipment, adapted to control the temperature of a docking station for a UAV, wherein a cover of the docking station includes a first and a second vents. The temperature control equipment includes a first and a second temperature control devices. The first temperature control device includes a first and a second airflow openings, and the second temperature control device includes a third and a fourth airflow openings. The first, second, third, and fourth airflow openings, and the first and second vents form a first airflow path; or the first and second airflow openings, the first vent, and a third vent of the cover form a second airflow path; or the first, second, third, and fourth airflow openings, the first, second, and third vents, a fourth vent of the cover form a third airflow path. A heater is located on the first, second or third airflow path.

A temperature controller for a heater for a container for use in hazardous areas and a method of programming such a temperature controller. The method of programming such a temperature controller comprises the steps of writing identification data and parameter data to a memory of a portable token in an area remote from the hazardous area; transporting the token to a position in proximity to the temperature controller in the hazardous area; transmitting, by means of near field communication, the identification data and parameter data stored in the memory of the portable token to a receiver in the temperature controller; comparing the identification data received by the temperature controller with identification data stored in a memory of the temperature controller; and if said comparison of identification data is positive, and updating parameter data stored in the memory of the temperature controller with the parameter data received by the receiver.