Abstract: The present disclosure is directed to systems and methods for automatically detecting a leak of a closed loop hydronic boiler system having a makeup water inlet line. The system may include a fluid flow sensor configured to sense fluid flow through the makeup water inlet line, and optionally a pressure sensor and/or a water chemistry sensor. In addition, the system may include a processor configured to detect positive movement of makeup water through the makeup water inlet line indicative of a leak of the hydronic boiler system based on the measured fluid flow, and cause a display to display information indicative of the leak upon detection of positive movement of makeup water through the makeup water inlet line. In some embodiments, the processor further may automatically adjust operations of the hydronic boiler system responsive to detection of the leak.

Abstract: Vapor compression cycle systems having extra heating capacity are disclosed. The vapor compression cycle system includes a first heat exchanger that receives a first fluid (e.g., a refrigerant) from a compressor. A first flow control valve receives the first fluid from the first heat exchanger and directs a first portion of the fluid it towards a second heat exchanger and a second portion of the fluid towards a third heat exchanger. The third heat exchanger also receives a second fluid (e.g., hot water). The second heat exchanger outputs the first portion of the first fluid and third heat exchanger outputs the second portion of the first fluid. The first portion and the second portion of the first fluid is then directed back towards the compressor.

Abstract: Systems and methods are provided for adaptive flow across multiple water heaters. The system may include a plurality of water heaters provided in a cascaded arrangement, with each of the water heaters including a valve. The valves may be, for example, motorized isolation valves that may be automatically closed and/or opened by one or more controllers associated with the water heaters. This may allow for the system to automatically regulate the flow rate through each of the water heaters to provide for optimal usage of the cascaded water heaters. For example, if it is determined by the one or more controllers (based on sensor data from the water heaters) that a flow rate has decreased below a threshold value for a giving water heater firing rate, one or more valves may be closed such that fewer water heaters are used and the flow rate is increased.

Abstract: The present disclosure is directed to systems and methods for automatically detecting a leak of a closed loop hydronic boiler system having a makeup water inlet line. The system may include a fluid flow sensor configured to sense fluid flow through the makeup water inlet line, and optionally a pressure sensor and/or a water chemistry sensor. In addition, the system may include a processor configured to detect positive movement of makeup water through the makeup water inlet line indicative of a leak of the hydronic boiler system based on the measured fluid flow, and cause a display to display information indicative of the leak upon detection of positive movement of makeup water through the makeup water inlet line. In some embodiments, the processor further may automatically adjust operations of the hydronic boiler system responsive to detection of the leak.

Abstract: 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.