A liquid heating system includes an instantaneous heater (18) having an inlet (20) connected to a reservoir (62). The outlet (22) of the heater is connected to fixtures (72) which use the heated liquid, and is also connected through a return connection (30) to the reservoir. In an idle mode, a pump 40 draws liquid from the reservoir (62), so that the liquid circulates through the heater and back to the reservoir. A controller (52) actuates the heater to heat the liquid to a first setpoint temperature, so that the liquid in the reservoir stabilizes at the first setpoint temperature. In a supply mode, some or all of the heated liquid flows from the outlet to the fixtures (72). Cold liquid is admitted from a supply (60) to the reservoir, and cold liquid desirably also is supplied to the heater inlet along with liquid from the reservoir, so that the heater inlet receives a combination of these. The controller controls the proportion of cold liquid to liquid from the reservoir in the combination, so as to maintain the heater at a setpoint heating rate while also maintaining the temperature of liquid discharged from the heater outlet at or near a setpoint temperature.

A method, system, apparatus, and/or device for preheating air for a rooftop air handling unit (RTU). The method, system, apparatus, and/or device may include a barrier system configured to surround the RTU. The barrier system may include a structure to provide a frame for the barrier system, a first barrier configured to connect to a first side of the structure, and a collector configured to connect to a second side of the structure. The method, system, apparatus, and/or device may include a duct configured to connect between the collector and a chamber. The method, system, apparatus, and/or device may include a chamber configured to connect to an air intake hood of the RTU. The chamber may include a first opening to receive air stored in the cavity, a second opening to receive external air, and a diverter configured to switch between a first position and a second position.

A water heater can include a tank, an inlet line, and an outlet line, where the inlet line provides unheated water to the tank, and where the outlet line draws heated water from the tank for a hot water demand. The water heater can also include a heat pump disposed adjacent to a first portion of the tank, where the heat pump applies heat to transform the unheated water to heated water in the first portion of the tank. The water heater can further include a resistive heating element disposed within a second portion of the tank, where the resistive heating element further applies heat to transform the unheated water to heated water in the second portion of the tank.

An infrared warmer device may include a touch sensor unit including a detecting wire mounted adjacent to a heating layer; a temperature sensor unit mounted adjacent to the heating layer; a cover covering the heating layer, an electrode unit, the touch sensor unit, and a temperature sensor unit; and a control unit controlling an amount of electric power supplied through the electrode unit such that a temperature detected by the temperature sensor unit reaches a target temperature, and changing the target temperature to a safe temperature when a touch of a body is detected through the touch sensor unit.

A peripheral unit for use in a water regulation system that controls the intake of water in a water circulation system of a building; it has a power source; a user input interface; a motion detector; a communication interface that is configured to establish a connection with the control panel; and a controller that is configured to send a first transmission to the control panel via the connection for causing the controller of the control panel to actuate opening of the water valve for a given period of time; and send a second transmission to the control panel via the connection for causing the controller of the control panel to actuate closing of the water valve.

A hydronic system (HS) that comprises at least one hydronic circuit (HC) and a control (CT) for controlling the operation of said at least one hydronic circuit (HC) via a control path (CP), whereby said control (CT) comprises a feed forward controller (FFC). Operation of the system is improved by the hydronic system (HS) further comprising a control improvement path (CIP) running from the at least one hydronic circuit (HC) to the control (CT). Due to the control improvement path (CIP), the control (CT) can be improved in the case of the hydronic system (HS) becoming instable and/or showing poor system control.

In a heating and hot water supply device including a burning means, a first heat exchanger, a circulation passage for circulating a heating thermal medium, a circulation pump, a first bypass passage, a second heat exchanger for hot water supply, a hot water supply passage, a second bypass passage bypassing the second heat exchanger, a control unit, and an operating terminal, a distribution means is provided at a branching portion of the first bypass passage and is capable of adjusting its distribution ratio for heating, or hot water supply, or simultaneous heating/hot water supply, a display means of the operating terminal is capable of providing displays corresponding to various types of operation.

Disclosed are systems and methods for automated hybrid pool heating unit configurations. An example method may include determining, by a processor, a first input parameter associated with an operation of a pool heating system comprising a first pool heating unit and a second pool heating unit, wherein the first pool heating unit is a first type of pool heating unit and the second pool heating unit is a second type of pool heating unit. The example method may also include sending, using the processor, based on receiving the first input parameter, a first signal to enable the first pool heating unit to heat a first pool. The example method may also include determining, by the processor, a second input parameter. The example method may also include sending, using the processor, based on receiving the second input parameter, a second signal to enable the second pool heating unit to heat the first pool.

The invention relates to a method for controlling at least one first circulation pump (17b, 17c) of a heating or cooling system (1) having a primary circuit (2, 2a) and a secondary circuit (4, 30a) coupled therewith at a transfer point (3, 29). The first circulation pump (17, 17b, 17c, 17b) conveys a heating or cooling medium in the primary circuit (2, 2a), and in the second secondary circuit (4, 30a), at least one second circulation pump (12, 17d) is located that conveys a heating or cooling medium in at least one partial area of the secondary circuit (4, 30a). The volume flow rate (formula I) of the first circulation pump (17, 17b, 17c, 17b) is controlled in functional dependence on the volume flow rate (formula II) of the secondary circuit (4, 30) behind the transfer point (3, 29). In this way, a demand based, and thus an energy-efficient control of the primary-side circulation pump is achieved. The invention further relates to a pump system, comprising the at least one first and the at least one second circulation pump for carrying out the method.

A heat exchanger includes a burner configured to burn a combustible gas to produce heat, a heat exchanger configured to receive the heat from the burner, a flow sensor configured to measure a flow rate of a coolant passing through the heat exchanger; and a controller comprising processing circuitry. The processing circuitry receives flow data from the flow sensor and controls a firing rate of the burner based on a predetermined relationship between a differential temperature of coolant flowing through the heat exchanger and the coolant's flow rate.