A low leakage current fluid heater and systems and methods thereof. The fluid heater has a configuration whereby a heating element is isolated from a fluid channel so as to leak into fluid passing through the channel an allowed amount of leakage current. Fluid passing through the fluid heater can be heated to a desired temperature. A controller can provide control signals to driver the fluid heater to the desired temperature and maintain the temperature at the desired temperature.

A tankless water heater comprising a bare wire heating element is disclosed which is connected to an electronic temperature control system. At least one sensor is furthermore connected to the electronic temperature control system. A fluid heating chamber is made of insulating non conductive material wherein the heating element is located. At least one switch is connected to at least one bare wire heating element and to a phase of an AC line. An electrode system and an electronic detecting circuit are interconnected. The electrode system is arranged in a fluid channel, in a short distance from the bare wire heating element which acts like electrode 1. The electrode 2 of the electrode system is made from a conductive tube material hydraulically connected to a throttle valve made from non conductive material to insulate the electrode 2 from the grounded collector. The electrode 2 is electrically connected to a electronic control system via a conductive material.

An electronic module housing having a rounded stylized dog-bone-type shape and an equatorial partial light bar. The shape provides a view of parts of the light bar from many locations. The controller circuitry can detect a malfunction among one or more of a plurality of current-drawing components by detecting that the total cumulative current drawing by all the components falls outside a predetermined nominal range.

A method of controlling a heating system is provided that includes having at least one heater assembly, the heater assembly comprising a plurality of heater units, each heater unit defining at least one independently controlled heating zone, supplying power to each of the heater units through power conductors electrically connected to each of the independently controlled heating zones in each of the heater units, and modulating power supplied to each of the independently controlled heating zones. A voltage is selectively supplied to each of the independently controlled heating zones such that a reduced number of independently controlled heating zones receives the voltage at a time, or at least a subset of the independently controlled heating zones receive a reduced voltage at all times.

An electronic module housing having a rounded stylized dog-bone-type shape and an equatorial partial light bar. The shape provides a view of parts of the light bar from many locations. The controller circuitry can detect a malfunction among one or more of a plurality of current-drawing components by detecting that the total cumulative current drawing by all the components falls outside a predetermined nominal range.

Systems and methods of mitigating a contact weld of a first relay for selectively transmitting power to a first heating element of a water heating system. One method includes providing a signal to open the first relay, determining, following providing the signal to open the first relay, a first temperature measurement of a portion of a fluid within a tank of the water heating system via a temperature sensor, determining whether a difference between the first temperature measurement and a first target setpoint exceeds a first predetermined threshold, and activating, in response to the difference between the first temperature measurement and the first target setpoint exceeding the first predetermined threshold, a vibration device for a predetermined time period, the vibration device being positioned such that a resulting vibration from an activation of the vibration device is transmitted to the first relay.

Systems and methods of mitigating a contact weld of a first relay for selectively transmitting power to a first heating element of a water heating system. One method includes providing a signal to open the first relay, determining, following providing the signal to open the first relay, a first temperature measurement of a portion of a fluid within a tank of the water heating system via a temperature sensor, determining whether a difference between the first temperature measurement and a first target setpoint exceeds a first predetermined threshold, and activating, in response to the difference between the first temperature measurement and the first target setpoint exceeding the first predetermined threshold, a vibration device for a predetermined time period, the vibration device being positioned such that a resulting vibration from an activation of the vibration device is transmitted to the first relay.

A fuel-fired condensing type air heating furnace is provided with an electronic condensate water level sensing system operative to sense improper outflow of condensate from a collector box portion of the furnace and responsively shut down or prevent operation of the furnace. Condensate probe portions of the system are oriented in a manner such that several air flow orientation of the furnace may be utilized without the necessity of relocating the probes or effecting an re-wiring of the water level sensing system.

A safety control system for an electric water heater includes: an inner tank, having a first pipeline, the inner tank including a water inlet connected with a water inlet pipe and a water outlet connected to a water outlet pipe, the water inlet pipe connected to a cold water source and in communication with the first pipeline through the water inlet, and the water outlet pipe in communication with the first pipeline through the water outlet; a heating module, arranged in the first pipeline; a sensing module, configured to sense a temperature of a cold water source flowing through the first pipeline; and a control device, configured to: verify whether the temperature is consistent with a set water temperature, and control on/off and a heating temperature of the heating module until the temperature is consistent with the set water temperature if a result of the verification is no.

A safety control system for an electric water heater includes: an inner tank, having a first pipeline, the inner tank including a water inlet connected with a water inlet pipe and a water outlet connected to a water outlet pipe, the water inlet pipe connected to a cold water source and in communication with the first pipeline through the water inlet, and the water outlet pipe in communication with the first pipeline through the water outlet; a heating module, arranged in the first pipeline; a sensing module, configured to sense a temperature of a cold water source flowing through the first pipeline; and a control device, configured to: verify whether the temperature is consistent with a set water temperature, and control on/off and a heating temperature of the heating module until the temperature is consistent with the set water temperature if a result of the verification is no.